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Methylation related genes affect sex differentiation in dioecious and gynodioecious papaya 认领 引用 被引量：7
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作者 Ping Zhou Xiaodan Zhang +3 位作者 Xinyi Ma Jingjing Yue Zhenyang Liao Ray Ming 《Horticulture Research》 SCIE CSCD 2022年第1期258-270,共13页
Morphological,genic and epigenetic differences often exist in separate sexes of dioecious and trioecious plants.However,the connections and relationships among them in different breeding systems are still unclear.Papa... Morphological,genic and epigenetic differences often exist in separate sexes of dioecious and trioecious plants.However,the connections and relationships among them in different breeding systems are still unclear.Papaya has three sex types,which is genetically determined and epigenetically regulated,andwas chosen as amodel to study sex differentiation.Bisulfite sequencing of genomic DNA extracted fromearly-stage f lowers revealed sex-specific genomic methylation landscapes and seasonally methylome reprogramming processes in dioecious and gynodioecious papaya grownin spring and summer.Extensivemethylation of sex-determining region(SDR)was the distinguishing epigenetic characteristics of nascent XY sex chromosomes in papaya.Seasonal methylome reprogramming of early-stage flowers in both dioecy and gynodioecy systems were detected,resulting from transcriptional expression pattern alterations of methylation-modification-related and chromatin-remodeling-related genes,particularly from those genes involved in active demethylation.Genes involved in phytohormone signal transduction pathway in male f lowers have played an important role in the formation of male-specific characteristics.These findings enhanced the understanding of the genetic and epigenetic contributions to sex differentiation and the complexity of sex chromosome evolution in trioecious plants. 展开更多
关键词 gynodioecious seasonally methylome reprogrammi methylation methylome reprogramming genomic methylation sex differentiationbisulfite sequencing genomic dna dioecious papaya
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Responses of dioecious Populus to heavy metals:a meta-analysis 认领 引用 被引量：1
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作者 Lei Yu Shuanglei Tang +2 位作者 Jieyu Kang Helena Korpelainen Chunyang Li 《Forestry Research》 2023年第1期48-55,共8页
A total of 946 sets of comparative data were collected from 20 publications and a meta-analysis performed to evaluate the responses of growth,photosynthetic capacity,oxidative stress and antioxidants in Populus female... A total of 946 sets of comparative data were collected from 20 publications and a meta-analysis performed to evaluate the responses of growth,photosynthetic capacity,oxidative stress and antioxidants in Populus females and males under exposure to heavy metals,like Cu,Mn,Zn,Pb and Cd.It was found that heavy metals have negative effects on Populus growth and photosynthetic capacity,as the average total biomass,leaf biomass,stem biomass,root biomass and height decreased by 29.78%,33.41%,27.22%,35.30%and 34.83%,respectively.Furthermore,total chl,Pn,gs,E,Ci decreased by 23.30%,26.03%,40.49%,23.76%and 18.24%,respectively.In addition,heavy metals increased oxidative stress and antioxidant enzyme activities:the average values of TBARS,H2O2,O2-and MDA increased by 51.39%,55.79%,64.67%and 48.92%,respectively,and proline,APX,NPT,POD,CAT and SOD increased by 68.91%,64.81%,68.40%,57.34%,77.30%and 49.01%,respectively.However,there were sex-specific responses to heavy metals:females suffered more negative effects,as they had significantly greater decreases in root biomass,R/S ratio,height and total chl,and significantly smaller increases in NPT and POD activities than males.The present meta-analysis shows the responses of Populus females and males to heavy metals on a regional scale,which is crucial for understanding the patterns of sexual dimorphism and sex ratio biases in Populus with increasing heavy metal pollution in the future. 展开更多
关键词 growth comparative data heavy metals heavy metalslike photosynthetic capacity oxidative stress antioxidants dioecious populus
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Evaluation of Protein Concentration, Amino Acid Profile and Antinutritional Compounds in Hempseed Meal from Dioecious and Monoecious Varieties 认领 引用 被引量：10
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作者 Roberto Russo Remo Reggiani 《American Journal of Plant Sciences》 CAS 2015年第1期14-22,共9页
Hempseed meal from three dioecious and three monoecious varieties has been evaluated for content and quality of the protein and for the concentration of antinutritional compounds. Hemp seeds were obtained from plants ... Hempseed meal from three dioecious and three monoecious varieties has been evaluated for content and quality of the protein and for the concentration of antinutritional compounds. Hemp seeds were obtained from plants grown in two experimental fields for two consecutive years (2011-2012). For all the varieties, hempseed meal resulted in a rich source of protein (34% mean content) with an amino acid profile extremely rich in arginine and slightly poor in lysine. Differences between dioecious and monoecious varieties were observed in the content of antinutritional compounds. They were more concentrated in monoecious varieties in comparison with those dioecious. The concentration of phytic acid in hempseed meal deserves attention in both groups, being 63 and 75.4 g·kg-1 of dry matter in dioecious and monocieous varieties, respectively. The results show that, besides the recognized value of hemp oil, also the hempseed cake could find application in animal feed as a substitute of other cakes (soybean, rapeseed). From this point of view, the dioecious varieties showing lower contents of antinutritional compounds with respect to the monoecious varieties would be preferred. 展开更多
关键词 Antinutritional Compounds Amino acid Profile Dioecious Monoecious Protein
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Sex-related adaptive responses in the carbon balance to diurnal variation in the dioecious species Morus alba 认领 引用
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作者 Xudong Huang Yixia Wang +4 位作者 Yaman Wang Meijing Yan Chunyan Zhang Xiao Xu Tingfa Dong 《Journal of Plant Ecology》 SCIE CSCD 2025年第2期315-327,共13页
The carbon balance processes of plants in response to diurnal environmental changes are critical for their growth and survival. While sex-specific responses in photosynthesis to environmental stress have been observed... The carbon balance processes of plants in response to diurnal environmental changes are critical for their growth and survival. While sex-specific responses in photosynthesis to environmental stress have been observed in several dioecious plant species, the diurnal dynamics of carbon balance in male and female individuals remain unexplored. Here, we investigated the diurnal variations of photosynthetic rate (A), dark respiration rate (Rd), A/Rd, and the concentration, pool, and allocation of nonstructural carbohydrates (NSC) of male and female mulberry (Morus alba) seedlings. Males exhibited the highest A at 09:00, while females had the highest A and Rd at 13:00. Male A was higher than female A at 09:00, whereas male Rd was lower than female Rd at 13:00. The A/Rd was higher in males than in females. The peak of NSC concentration in males was earlier than in females, and the NSC concentration and storage in the whole plant, leaves and bark were generally higher in males than in females across most time points. The average NSC allocation followed the leaves > roots > bark ≈ trunk trend, but its dynamic changes over the daily cycle were more pronounced in females than in males. These findings suggest that carbon balance processes in mulberry seedlings exhibit sex-specific responses to diurnal changes, with females displaying greater sensitivity to these variations. This study provides the first attempt to explore such responses in woody plants and suggests that future carbon cycle models for terrestrial plants should incorporate plant sex. 展开更多
关键词 carbon allocation circadian rhythm dioecious plant nonstructural carbohydrates sexual dimorphism
Centromere architecture and sex chromosome evolution in garden asparagus revealed by a gap-free haplotype-resolved genome 认领 引用
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作者 Ke-Li Jia Yi Wang +8 位作者 Xia Li Rui-Yan Song Chun-Xia Yang Hao-Han Ning Yan-Cun Bao Yu-Lan Zhang Lu-Xian Liu Wu-Jun Gao Shu-Fen Li 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2026年第7期1340-1343,共4页
Garden asparagus(Asparagus officinalis,2n=2x=20)is a globally important vegetable crop renowned for its nutritional and economic value.It exhibits clear sexual dimorphism,with male and female individuals differentiate... Garden asparagus(Asparagus officinalis,2n=2x=20)is a globally important vegetable crop renowned for its nutritional and economic value.It exhibits clear sexual dimorphism,with male and female individuals differentiated under a genetically defined XY system.The coexistence of dioecious and hermaphroditic species within the genus Asparagus makes it an excellent model for studying the origin and diversification of sex chromosomes(Bentz et al.,2024). 展开更多
关键词 centromere architecture sexual dimorphismwith sex chromosome evolution male female individuals dioecious garden asparagus haplotype resolved genome genetically defined xy systemthe
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Evaluation,Validation,and Application of Sex-Specific Molecular Marker in Kiwifruit(Actinidia spp.) 认领 引用
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作者 Hui Zhang Yingchun He +5 位作者 Min Hong Yang Wang Mingzhang Li Qiguo Zhuang Kui Du Yue Xie 《Phyton-International Journal of Experimental Botany》 SCIE 2026年第2期69-85,共17页
The genus Actinidia is primarily functionally dioecious,and early sex identification plays a crucial role in improving breeding efficiency and reducing production costs.In this study,the accuracy of three sex-linked m... The genus Actinidia is primarily functionally dioecious,and early sex identification plays a crucial role in improving breeding efficiency and reducing production costs.In this study,the accuracy of three sex-linked molecular markers(SyGI[Shy Girl],FrBy[Friendly Boy],and SmY1)in sex identification was evaluated in various Actinidia species.The selected marker products were subsequently cloned and sequenced in six wild Actinidia species.Ninety-six wild A.chinensis chinensis accessions and 74 A.chinensis deliciosa accessions,most of which were wild,with only one cultivated,were used for comprehensive primer validation.Thirty-three juvenile A.chinensis chinensis hybrid seedlings were used for practical application tests.The results showed that the marker SyGI accurately identified the sex of 20 samples from six Actinidia species and 96 A.chinensis chinensis accessions with 100%reliability.For Actinidia chinensis deliciosa,the identification accuracy reached 98.65%.Sequence analysis revealed that SyGI shared the highest similarity with the male-specific genomic region.Furthermore,SyGI achieved 100%accuracy in identifying the sex of 33 juvenile A.chinensis chinensis individuals.The findings confirm that the SyGI marker possesses high accuracy,strong specificity,and broad applicability,making it a valuable tool for kiwifruit breeding programs.The cloned sequences from wild Actinidia species also provide important references for future research on the mechanisms of sexual evolution and determination. 展开更多
关键词 Actinidia dioecious sex identification SyGI accuracy specificity applicability
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Sex-specific responses of tree-ring growth to climate in the dioecious tree Populus cathayana 认领 引用 被引量：3
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作者 Kechao Huang Yongmei Liao +5 位作者 Tingfa Dong Yanxia Yang Jundong He Huihui Huan Qibing Zhang Xiao Xu 《Journal of Plant Ecology》 SCIE CSCD 2018年第5期771-779,共9页
Aims Radial growth in response to climate has been reported in many trees,but the sex-specific responses of tree-ring growth associated with altitude in dioecious trees are still poorly known.This study aims to examin... Aims Radial growth in response to climate has been reported in many trees,but the sex-specific responses of tree-ring growth associated with altitude in dioecious trees are still poorly known.This study aims to examine whether(i)there are sex-related responses of tree-ring growth to climate in dioecious trees;(ii)these responses could be changed with altitude elevation.Methods The tree-ring width and basal area increment(BAI)were measured over the past 30 years(1982-2011),and the sexual differences in relationship between BAI and time span and correlations between ring width and climatic factors were investigated in Populus cathayana trees at two altitude sites(1,450 m and 1,750 m a.s.l.)in Xiaowutai Mountain,Hebei,north China.Important Findings The BAI was increased over the past 30 years.Trees at high-altitude sites had significantly lower mean ring width and mean BAI than those trees at low-altitude sites(P<0.001).In addition,sexual dif-ferences in tree-ring growth and its response to climate were more pronounced by altitude elevation.Male trees had a significantly larger mean ring width and mean BAI than did females at high-alti-tude sites,whereas no significant sexual differences in these traits were detected at low-altitude sites.Female trees were sensitive to previous October-November temperatures at high altitude but to current February and April precipitation at low altitude(P<0.05),whereas male trees were sensitive to current June temperature at high altitude but to January precipitation at low altitude(P<0.05).Our results indicated that the responses of tree-ring growth to cli-mate are sex dependent and can be changed with altitude elevation. 展开更多
关键词 altitude basal area increment(BAI) dendroclimatology dioecious Populus cathayana and ring width
Intersexual differences in leaf size and shape in dioecious Adriana tomentosa 认领 引用 被引量：4
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作者 Mariola Rabska Nigel W.M.Warwick +1 位作者 Grzegorz Iszkulo Caroline L.Gross 《Journal of Plant Ecology》 SCIE CSCD 2021年第1期67-83,共17页
Aims Leaf size and shape as objects of natural selection can play adaptive roles,and can change with the age of leaves.They can differ between sexes in dioecious species,and in most cases,females have larger leaves.Pr... Aims Leaf size and shape as objects of natural selection can play adaptive roles,and can change with the age of leaves.They can differ between sexes in dioecious species,and in most cases,females have larger leaves.Previous studies showed that sexes of Adriana tomentosa differed in their leaf lobing.In this study,we investigated whether there were other differences between sexes in leaf size,shape and ecophysiology,and if those differences were connected with adaptations and reproductive roles in the sexes of A.tomentosa.Methods Physical and chemical features of young and old leaves originating from female and male A.tomentosa plants growing in two disjunct populations in eastern Australia were measured.We determined leaf area,perimeter length,serration,circularity,aspect ratio(AR),roundness and the ecophysiological factors:specific leaf area,dry matter content,leaf moisture,relative water content,δ13C,δ15N isotope compositions,carbon and nitrogen contents and C:N ratio.Leaf lobing,the degree of lamina damage and the content of photosynthetic pigments were also determined.Important Findings In both populations studied,the sex of plants significantly influenced almost all parameters connected with leaf morphology such as area,perimeter length,circularity,AR and roundness.Contrary to expectations,males from both populations had a greater leaf area that was independent of leaf age.Male leaves were more lobed with a longer perimeter,but they were less elongated and less serrated.Only small differences between female and male leaves were observed for the ecophysiological factors.The degree of leaf damage differed between sexes but also with population.Differences between sexes in leaf area and shape were not compensated by measured ecophysiological factors.However,leaf area may be compensated by other ecophysiological mechanisms related to leaf morphology,because females had greater leaf serration in comparison to males despite the smaller leaf area. 展开更多
关键词 Adriana tomentosa dioecious species leaf shape leaf size serration C:N ratio
Transcriptome analysis of Idesia polycarpa Maxim. var vestita Diels fl owers during sex differentiation 认领 引用 被引量：4
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作者 Tingting Li Fosheng Li +3 位作者 Lanju Mei Na Li Min Yao Lin Tang 《Journal of Forestry Research》 SCIE CAS CSCD 2020年第6期2463-2478,共16页
Idesia polycarpa Maxim.var vestita Diels.is a dioecious tree species native to eastern Asia.There are diffi culties associated with distinguishing the sex of the plant at the seedling stage.In order to explore the mec... Idesia polycarpa Maxim.var vestita Diels.is a dioecious tree species native to eastern Asia.There are diffi culties associated with distinguishing the sex of the plant at the seedling stage.In order to explore the mechanism of sex diff erentiation in fl ower development,we conducted the transcriptome profi les of male and female fl owers at early,metaphase and late developmental stages.Approximately 123,335 unigenes with a total length of 83,996 Mb and an average length of 168 bp were assembled.The unigenes were blasted into Nr,Nt,Pfam,KOG/COG,Swiss-prot,KEGG,GO databases.Homology analysis demonstrated that I.polycarpa and black cottonwood had the highest homology with the alignment of 92,871 sequences.This study identifi ed 80 groups of transcription factor families with a total of 1475 unigenes,mainly including MYB,WRKY,AP2 and bHLH transcription factor families.KEGG pathway analysis showed that the expression of numerous plant hormones(cytokinin,gibberellin and ethylene)and fl avonoid biosynthesis pathway were diff erent at various stages of female and male fl ower development.In addition,a number of unigenes associated with fl owering were identifi ed which were key genes associated with photoperiodic,vernalization,thermosensory,gibberellin,and autonomic pathways.The results show that I.polycarpa fl oral organ development was in accordance with the ABCDE model,in which the down-regulation of the B gene family might aff ect stamen fertility in late stages of female fl ower development.qRTPCR experiments validated that the expression patterns of 15 unigenes were consistent with those in RNA-seq results.The results highlight a central role for plant sex identifi cation in seedling production and a sex-determining mechanism for dioecious plants.In addition,the transcriptome data provided a theoretical basis for I.polycarpa genetic diversity analysis and molecular-assisted breeding. 展开更多
关键词 Dioecious plants Transcriptome sequencing Sex diff erentiation Idesia polycarpa Floral organ development Transcription factor
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Genome assembly and resequencing shed light on evolution,population selection,and sex identification in Vernicia montana 认领 引用 被引量：2
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作者 Wenying Li Xiang Dong +7 位作者 Xingtan Zhang Jie Cao Meilan Liu Xu Zhou Hongxu Long Heping Cao Hai Lin Lin Zhang 《Horticulture Research》 SCIE CSCD 2024年第7期207-221,共15页
Vernicia montana is a dioecious plant widely cultivated for high-quality tung oil production and ornamental purposes in the Euphor-biaceae family.The lack of genomic information has severely hindered molecular breedin... Vernicia montana is a dioecious plant widely cultivated for high-quality tung oil production and ornamental purposes in the Euphor-biaceae family.The lack of genomic information has severely hindered molecular breeding for genetic improvement and early sex identification in V.montana.Here,we present a chromosome-level reference genome of a male V.montana with a total size of 1.29 Gb and a contig N50 of 3.69 Mb.Genome analysis revealed that different repeat lineages drove the expansion of genome size.The model of chromosome evolution in the Euphorbiaceae family suggests that polyploidization-induced genomic structural variation reshaped the chromosome structure,giving rise to the diverse modern chromosomes.Based on whole-genome resequencing data and analyses of selective sweep and genetic diversity,several genes associated with stress resistance and flavonoid synthesis such as CYP450 genes and members of the LRR–RLK family,were identified and presumed to have been selected during the evolutionary process.Genome-wide association studies were conducted and a putative sex-linked insertion and deletion(InDel)(Chr 2:102799917-102799933 bp)was identified and developed as a polymorphic molecular marker capable of effectively detecting the gender of V.montana.This InDel is located in the second intron of VmBASS4,suggesting a possible role of VmBASS4 in sex determination in V.montana.This study sheds light on the genome evolution and sex identification of V.montana,which will facilitate research on the development of agronomically important traits and genomics-assisted breeding. 展开更多
关键词 evolution contig n genomic information repeat lineages resequencing dioecious plant molecular breeding vernicia montana
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Morphological and physiological differences in heteromorphic leaves of male and female Populus euphratica Oliv. 认领 引用 被引量：2
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作者 LI Xiu ZHAI Juntuan LI Zhijun 《Journal of Arid Land》 SCIE CSCD 2022年第12期1456-1469,共14页
Leaf traits can directly reflect the adaptation strategies of plants to the environment.However,there is limited knowledge on the adaptation strategies of heteromorphic leaves of male and female Populus euphratica Oli... Leaf traits can directly reflect the adaptation strategies of plants to the environment.However,there is limited knowledge on the adaptation strategies of heteromorphic leaves of male and female Populus euphratica Oliv.in response to individual developmental stages(i.e.,diameter class)and canopy height changes.In this study,morphological and physiological properties of heteromorphic leaves of male and female P.euphratica were investigated.Results showed that both male and female P.euphratica exhibited increased leaf area(LA),leaf dry weight(LDW),leaf thickness(LT),net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(gs),proline(Pro),and malondialdehyde(MDA)concentration,decreased leaf shape index(LI)and specific leaf area(SLA)with increasing diameter and canopy height.Leaf water potential(LWP)increased with increasing diameter,LWP decreased significantly with increasing canopy height in both sexes,and carbon isotope fraction(δ13C)increased significantly with canopy height in both sexes,all of which showed obvious resistance characteristics.However,males showed greater LA,LT,Pn,Tr,and Pro than females at the same canopy height,and males showed significantly higher LA,SLA,LT,Pn,Tr,gs,and MDA,but lower LWP and δ13C than females at the same canopy height,suggesting that male P.euphratica have stronger photosynthetic and osmoregulatory abilities,and are sensitive to water deficiency.Moreover,difference between male and female P.euphratica is closely related to the increase in individual diameter class and canopy height.In summary,male plants showed higher stress tolerance than female plants,and differences in Pn,gs,Tr,Pro,MDA,δ13C,and LWP between females and males were related to changes in leaf morphology,diameter class,and canopy height.The results of this study provide a theory for the differences in growth adaptation strategies during individual development of P.euphratica. 展开更多
关键词 arid area canopy height dioecious plants morphology physiological characteristics
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Restorer of fertility like 30,encoding a mitochondrion-localized pentatricopeptide repeat protein,regulates wood formation in poplar 认领 引用 被引量：1
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作者 Xiaokang Fu Ziwei Yang +7 位作者 Li Guo Lianjia Luo Yuanxun Tao Ting Lan Jian Hu Zeyu Li Keming Luo Changzheng Xu 《Horticulture Research》 SCIE CSCD 2024年第9期81-92,共12页
Nuclear–mitochondrial communication is crucial for plant growth,particularly in the context of cytoplasmic male sterility(CMS)repair mechanisms linked to mitochondrial genome mutations.The restorer of fertility-like(... Nuclear–mitochondrial communication is crucial for plant growth,particularly in the context of cytoplasmic male sterility(CMS)repair mechanisms linked to mitochondrial genome mutations.The restorer of fertility-like(RFL)genes,known for their role in CMS restoration,remain largely unexplored in plant development.In this study,we focused on the evolutionary relationship of RFL family genes in poplar specifically within the dioecious Salicaceae plants.PtoRFL30 was identified to be preferentially expressed in stem vasculature,suggesting a distinct correlation with vascular cambium development.Transgenic poplar plants overexpressing PtoRFL30 exhibited a profound inhibition of vascular cambial activity and xylem development.Conversely,RNA interference-mediated knockdown of PtoRFL30 led to increased wood formation.Importantly,we revealed that PtoRFL30 plays a crucial role in maintaining mitochondrial functional homeostasis.Treatment with mitochondrial activity inhibitors delayed wood development in PtoRFL30-RNAi transgenic plants.Further investigations unveiled significant variations in auxin accumulation levels within vascular tissues of PtoRFL30-transgenic plants.Wood development anomalies resulting from PtoRFL30 overexpression and knockdown were rectified by NAA and NPA treatments,respectively.Our findings underscore the essential role of the PtoRFL30-mediated mitochondrion-auxin signaling module in wood formation,shedding light on the intricate nucleus–organelle communication during secondary vascular development. 展开更多
关键词 nuclear mitochondrial communication cytoplasmic male sterility cms repair restorer fertility wood formation dioecious salicaceae poplar mitochondrion localized pentatricopeptide repeat protein evolutionary relationship
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Rhizosphere bacterial communities and soil nutrient conditions reveal sexual dimorphism of Populus deltoides 认领 引用 被引量：1
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作者 Qiliang Zhu Kun Yan +1 位作者 Yufeng Dong Yanping Wang 《Journal of Forestry Research》 SCIE CAS CSCD 2023年第3期761-771,共11页
Sexual dimorphism of plants shapes the diff erent morphology and physiology between males and females.However,it is still unclear whether it infl uences belowground ecological processes.In this study,rhizosphere soil ... Sexual dimorphism of plants shapes the diff erent morphology and physiology between males and females.However,it is still unclear whether it infl uences belowground ecological processes.In this study,rhizosphere soil of male and female Populus deltoides and bulk soil were collected from an 18-year plantation(male and female trees mix-planted)and grouped into three soil compartments.Soil carbon(C),nitrogen(N)and phosphorus(P)levels were determined,and soil bacterial communities were analyzed by high-throughput sequencing.The results showed the less total carbon and total organic carbon,the more nutrients(available phosphorus,nitrate nitrogen and ammonium nitrogen)available in the rhizosphere soils of female poplars than soils of males.However,α-diversity indices of the rhizosphere bacterial communities under male plants were signifi-cantly higher.Principal component analysis showed that the bacterial communities were signifi cantly diff erent between the male and female soil compartments.Further,the bacterial co-occurrence network in soil under male trees had more nodes and edges than under females.BugBase analysis showed the more functional bacteria taxa related to biofi lm formation and antioxidation under males.The results indicate that soils under male poplars had more diverse and more complex co-occurrence networks of the rhizosphere bacterial community than soils under female trees,implying that male poplars might have better environmental adaptability.The study provides insight into the diff erent soil-microbe interactions of dioecious plants.More details about the infl uencing mechanism of sexual dimorphism on rhizosphere soil bacterial communities need to be further studied. 展开更多
关键词 Dioecious poplar Rhizosphere bacterial community High-throughput sequencing Bacterial function prediction
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Assessing Anthropogenic Pressure and Its Impact on Hippophae salicifolia Pockets in Central Himalaya,Uttarakhand 认领 引用
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作者 Deepak DHYANI Shalini DHYANI RK MAIKHURI 《Journal of Mountain Science》 SCIE CSCD 2013年第3期464-471,共8页
Natural habitat ofHippophae salicifolia in Central Himalaya is continuously being degraded due to habitat destruction and harvesting. Although logging is prohibited, habitat destruction has increased because of regula... Natural habitat ofHippophae salicifolia in Central Himalaya is continuously being degraded due to habitat destruction and harvesting. Although logging is prohibited, habitat destruction has increased because of regular road construction, repairing and broadening activities. In addition, Hippophae resources are continuously being harvested by lopping （both partial and complete） for fuelwood, fodder and fruits in higher Himalayan region. This paper presents a detailed analysis of relationship between density, demographic structure, and harvesting of H. salicifolia growing pockets in the five major valleys （Gangotri, Yamunotri, Niti, Mana and Bhyundhar） of Uttarakhand in Central Himalaya, India. A total of 12o quadrats were laid randomly to study population structure, regeneration, sex ratio and lopping using quadrats of lOO m2 （a4 in each valley） in Hippophae growing patches. Our study shows that the density, size distribution, and regeneration of Hippophae vary considerably among the major valleys. Trees in the Yamunotri valley have the highest density of large trees but the lowest density of seedlings. In contrast, there are few large trees but many seedlings in the Mana valley. The number and size of lopped trees also varied among the valleys. Lopping was greatest in Bhyundhar （11.4%） and Yamunotri （19.7%） and least in Niti （3.9%）. The size of lopped trees differed substantially as well. In Bhyundhar, the largest trees were taken while saplings were taken in Yamunotri. Our study revealed that unsustainable harvesting from plants for fuel, fencing and fruits along with road broadening activities in Central Himalaya are the main cause ofhabitat destruction. Our research highlights the urgent need for in-situ and ex-situ conservation of Hippophae salicifolia so that it＇s potential can be harnessed sustainably by rural hill societies for their socio-economic development. 展开更多
关键词 Central Himalaya Seabuckthorn Dioecious Disturbance Habitat Conservation
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Karyological and Electrophoretic Distinction between Sexes of Trichosanthes bracteata 认领 引用 被引量：1
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作者 Kanika Karmakar Rabindra Kumar Sinha Sangram Sinha 《American Journal of Plant Sciences》 CAS 2013年第3期494-497,共4页
Chromosome studies and soluble protein profiles, fractionated by reducing and non-reducing SDS-PAGE, were carried out in dioecious Trichosanthes bracteata. Somatic chromosome no. 2n = 22 was recorded in both sexes. Th... Chromosome studies and soluble protein profiles, fractionated by reducing and non-reducing SDS-PAGE, were carried out in dioecious Trichosanthes bracteata. Somatic chromosome no. 2n = 22 was recorded in both sexes. The karyotype of male and female plant shows high homogeneity and the absence of any heteromorphic pair of chromosomes negates the possibility of XY mechanism. Soluble protein profiles from the tuberous roots of the male and female plants, fractionated by reducing SDS-PAGE, did not show any qualitative distinction. Whereas the protein profile in non-reducing SDS-PAGE reveals a clear distinction when compared on a single gel. The difference is marked by the presence of a disulphide linked tertiary or folded protein at 19 k D region detected in male sex. However, at the level of primary structure the qualitative expression is similar indicating a common ancestry. 展开更多
关键词 Trichosanthes bracteata Dioecious Reducing and Non-Reducing SDS-PAGE
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Conocephalum conicum(L.) Dumort: A Case of Unique Reproductive Biology 认领 引用
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作者 Madhu Bhagat Anil Sharma Anima Langer 《American Journal of Plant Sciences》 CAS 2012年第8期1145-1149,共5页
This paper reports spore-elater ratio per capsule in three populations of Conocephalum conicum collected from different regions of Jammu and Kashmir (Doda, Ladakh and Bhaderwah). Spore-elater ratio came out to be 0.40... This paper reports spore-elater ratio per capsule in three populations of Conocephalum conicum collected from different regions of Jammu and Kashmir (Doda, Ladakh and Bhaderwah). Spore-elater ratio came out to be 0.40-0.43:1, far less than expected for Marchantialian taxa. The ratios thus obtained were compared with that present in herbarium specimen collected in 1958 from Kyushu. The ratios have remained constant since many decades, thereby indicating that the sex-ual reproduction has lesser role to play in the propagation of this species. 展开更多
关键词 Reproductive Biology Liverworts Dioecious Sporophyte Spore-Elater Ratio
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The sexual dimorphism displayed by the roots of mulberry(Morus alba)saplings depends on the sex of the neighboring plants 认领 引用 被引量：6
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作者 Chunyan Zhang Juan Zhu +3 位作者 Gang Liu Youyou Huang Gaiqun Huang Xiao Xu 《Journal of Plant Ecology》 SCIE CSCD 2021年第6期1037-1046,共10页
Aims Dioecious plants present sexual dimorphism,but how the root traits and nutrient uptake of female and male plants in dioecious species response to the sexual identity change of the neighbor plants are poorly under... Aims Dioecious plants present sexual dimorphism,but how the root traits and nutrient uptake of female and male plants in dioecious species response to the sexual identity change of the neighbor plants are poorly understood.Methods Mulberry(Morus alba L.),a dioecious plant widely distributed in China,was employed in our study.Male and female plants were grown with neighbors of the same and opposite sex for 3 months.At harvest,the root anatomy,root morphology,nutrient concentrations and biomass accumulation were measured.Important Findings When grown with the opposite sex,the males showed decreases in root xylem size,biomass of root and stem and increases in root N,P and K concentrations compared with grown with the same sex.By contrast,females showed significant increases in xylem size,fine root system(e.g.fine root length,root surface area and root volume),root carbon isotope composition(δ13C)and root N,P and K concentrations.The changes in theδ13C and N,P and K concentrations in male and female plants were associated with the changes of root traits.These results demonstrated that the sexual identity of the neighboring plants affected root anatomy and morphology of female and male mulberry plants.Meanwhile,the responses of female and male plants to the sex change of the neighboring plants showed sexual dimorphism,which influenced water-use efficiency and resource acquisition.These findings are important for understanding the population dynamics of other dioecious species in forestry and natural systems. 展开更多
关键词 dioecious plant intersexual combination intrasexual combination Morus alba nutrition root traits
Sex-specific strategies of resource utilization and determining mechanisms of Hippophae rhamnoides in response to community succession 认领 引用
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作者 Baoli Fan Pengfei Gao +3 位作者 Tingting Tian Nana Ding Yongkuan Wan Xianhui Zhou 《Journal of Plant Ecology》 SCIE CSCD 2024年第4期114-130,共17页
The dioecious plant,Hippophae rhamnoides,is a pioneer species in community succession on the Qinghai-Tibet Plateau(QTP),plays great roles in various ecosystem services.However,the males and females of the species diff... The dioecious plant,Hippophae rhamnoides,is a pioneer species in community succession on the Qinghai-Tibet Plateau(QTP),plays great roles in various ecosystem services.However,the males and females of the species differ both in their morphology and physiology,resulting in a change in the ratio of male to female plants depending on the environment.To further explore the functional traits critical to this sex-based distinctive response in the alpine grassland,we have surveyed the sex ratios,measured their photosynthetic parameters,height,leaf area and biomass allocation.The results showed that(i)The males had higher Pn,light saturation point,apparent quantum efficiency,Amaxand lower water-use efficiency(WUE),which exhibited higher utilization efficiency or tolerance to strong light,while the females indicated higher utilization efficiency for low light and water.And it showed sex-specific biomass allocation patterns.(ii)H.rhamnoides populations across the successional stages all showed a male-biased sexual allocation,which was closely related to sex-specific WUE,Pn,root biomassotal biomass and root-crown ratio.(iii)The leaf traits of H.rhamnoides changed from higher Narea,Pareaand leaf mass per area in the early and late to lower in the middle,which meant they moved their growth strategy from resource rapid acquisition to conservation as the succession progressed.(iv)The increasing soil total phosphorus mostly contributed to regulating the sex bias of populations and variations of traits during the succession.The results are vital for the management of grassland degradation and restoration due to shrub encroachment on the QTP. 展开更多
关键词 dioecious sex ratio shrub encroachment functional traits physiological and ecological strategies
Reproductive patterns in Araucaria araucana forests in the Andean range,Chile 认领 引用 被引量：2
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作者 Sergio Donoso Karen Peña-Rojas +3 位作者 Claudia Espinoza Carolain Badaracco Rómulo Santelices-Moya Antonio Cabrera-Ariza 《Ecological Processes》 SCIE EI CSCD 2024年第1期252-261,共10页
Background Araucaria araucana is a mast species that presents a high variability in annual cone production.Researchers have recorded synchronization events in cone production in different populations,which allows the ... Background Araucaria araucana is a mast species that presents a high variability in annual cone production.Researchers have recorded synchronization events in cone production in different populations,which allows the seed production to be concentrated,reducing the percentage of seeds consumed by different animal species.Methods We sampled three populations located in the Andes Mountains,Araucanía Region,Chile.In 2004 we began the collection of data on cone production,for which we installed permanent plots(1200 m2each)at each location.We identified and labeled each female tree in each plot to monitor its cone production.In 2012 we selected a total of 30 trees near the plots to evaluate the number of seeds per cone.In each February from 2012 to 2014 we selected two mature cones and covered them with a porous mesh for subsequent collection and storage in March.At the beginning of June,we counted and weighed the seeds,determining the average weight,the number of seeds per cone,the germination capacity(GC),and the germination speed(GS).Results Cone production was synchronous across the three locations.We observed significant differences among the locations and years evaluated.The cones had fewer seeds in 2013(high production)compared to those in 2012(low production),but their weights were similar.In 2014 the cones produced smaller seeds in fewer quantities.The difference between the years 2013 and 2014 resulted from the high-energy expenditure in 2013.Regarding GC and GS,there were significant differences among the three locations(GC:F=45.41,p<0.01;GS:F=96.08,p<0.01),where the highest values were observed in 2013.Conclusions Both GC and GS are related to seed weight but not to the number of cones produced in a given year.These annual fluctuations in seed production are determining factors in the population dynamics of forest species.Our results allow a better understanding of the reproductive phenology of A.araucana and could help define sustainable use and conservation actions for this species. 展开更多
关键词 Seed weight Germination potential Masting species Sustainable use Dioecious species
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