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East Asia-eastern North America disjunction revisited:Possible westward colonization route via the Western Palearctic in Carex sect.Paniceae(Cyperaceae) 认领 引用
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作者 Yi-Fei Lu Carmen Benítez-Benítez +5 位作者 Okihito Yano Hiroshi Ikeda Sae-Eun Jung Sangtae Kim Pedro Jiménez-Mejías Xiao-Feng Jin 《Journal of Systematics and Evolution》 SCIE CSCD 2025年第4期974-987,共14页
Carex sect.Paniceae sensu lato(s.l.)exhibits two major disjunct centers of diversity:eastern North America and East Asia.This pattern,commonly observed in other plant groups,has been associated with trans-Pacific disp... Carex sect.Paniceae sensu lato(s.l.)exhibits two major disjunct centers of diversity:eastern North America and East Asia.This pattern,commonly observed in other plant groups,has been associated with trans-Pacific dispersal from Asia to America and subsequent local extinctions in western North America.This study reconstructed a phylogenetic tree using two nuclear(external transcribed spacer and internal transcribed spacer)and three plastid(matK,trnL-F,and rpl32-trnLUAG)regions,along with 474 nuclear loci from high-throughput sequencing(Hyb-Seq).Dating analysis and ancestral area reconstruction were used to investigate the evolutionary and biogeographic history of sect.Paniceae s.l.A broader circumscription of sect.Paniceae s.l.,incorporating sects.Bicolores and Laxiflorae,is established.Two primary clades were identified:one clade predominantly diversified in North America and the other in East Asia.Biogeographic analyses suggested a likely origin of sect.Paniceae s.l.in the Palearctic during the Late Miocene.The most probable scenario involved dispersal to eastern North America via the Western Palearctic,followed by subsequent dispersal into western North America,other parts of the continent,and back to the Old World.Within East Asia,the group was inferred to have diversified during the Pliocene and Pleistocene,with the basalmost nodes inferred in China's Mainland.Multiple dispersal events from this region to the Russian Far East,Korea,and Japan were inferred.This study highlights the underexplored role of East Asia in the biogeography of grass-like plants and the existence of alternative migration routes in explaining the East Asia-eastern North America pattern of disjunction. 展开更多
关键词 biogeography Carex East Asia-eastern North America disjunction phylogeny sect.Bicolores sect.Laxiflorae sect.Paniceae
基于Adh基因家族序列的牡丹组(Sect.MoutanDC.)种间关系 认领 引用 被引量：38
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作者 林启冰 周志钦 +2 位作者 赵宣 潘开玉 洪德元 《园艺学报》 CAS 北大核心 2004年第5期627-632,共6页
测定了牡丹组 7个种 10个野生居群共 10份样品的全部Adh1A、Adh1B和Adh2基因序列。结合前人已报道的牡丹野生种的Adh基因序列 ,以芍药组 (Sect .Paeonia)和北美芍药组 (Sect.Oneapia)的种作外类群 ,用PAUP (4 0b 4a)计算机程序构建了牡... 测定了牡丹组 7个种 10个野生居群共 10份样品的全部Adh1A、Adh1B和Adh2基因序列。结合前人已报道的牡丹野生种的Adh基因序列 ,以芍药组 (Sect .Paeonia)和北美芍药组 (Sect.Oneapia)的种作外类群 ,用PAUP (4 0b 4a)计算机程序构建了牡丹组全部 8个种的Adh1A、Adh1B和Adh2基因树 (最大简约树和邻接树 ) ,同时进行了Adh1A、Adh1B和Adh2基因序列的合并分析。结果表明 ,牡丹组的 8个种分为两个具有 90 %以上自展值支持的单系分支 ,分别对应Stern (194 6 )根据形态划分的革质花盘亚组 (Subsect .Vaginatae)和肉质花盘亚组 (Subsect.Delavayanae)。在革质花盘亚组内 ,本研究结果支持银屏牡丹 (Paeoniasuffruticosassp .yinpingmudan)和凤丹 (P .ostii)、紫斑牡丹 (P .rockii)和四川牡丹 (P .decomposita)以及矮牡丹 (P .jishanensis)和卵叶牡丹 (P .qiui)各种之间有更近的亲缘关系 ,但有关牡丹复合体 (P .suffruticosacomplex)内各种间更进一步的关系还有待进一步研究。根据Adh基因树并结合前人的结果对牡丹组的种间关系进行了详细的讨论。 展开更多
关键词 Adh基因家族 基因序列 牡丹组 Sect.MoutanDC. 种间关系
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DNA barcoding in closely related species:A case study of Primula L.sect.Proliferae Pax(Primulaceae) in China 认领 引用 被引量：10
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作者 Hai-Fei YAN Gang HAO +1 位作者 Chi-Ming HU Xue-Jun GE 《Journal of Systematics and Evolution》 SCIE CAS CSCD 北大核心 2011年第3期225-236,共12页
DNA barcoding is a method of identifying species by analyzing one or a few short standardized DNA sequences. There are particular challenges in barcoding plants, especially for distinguishing closely related species. ... DNA barcoding is a method of identifying species by analyzing one or a few short standardized DNA sequences. There are particular challenges in barcoding plants, especially for distinguishing closely related species. Hence, there is an urgent need to evaluate the performance of candidate loci for distinguishing between species, especially closely related species, to complement the rbcL ＋ matK combination suggested as the core barcode for land plants. We sampled 48 individuals representing 12 species in Primula sect. Proliferae Pax in China to evaluate the performance of eight leading candidate barcode loci （matK, rbcL, rpoB, rpoC1, trnH-psb.4, psbK-psbI, atpF- atpH, and internal transcribed spacer （ITS））. The core combination rbcL ＋ matK gave only 50% species resolution in sect. Proliferae. In terms ofintraspecies and interspecies divergence, degree of monophyly, and sequence similarity, ITS, trnH-psbA, and psbK-psbI showed good performance as single-locus barcodes. Internal transcribed spacer displayed the highest genetic divergence and best discriminatory power, both alone and in combination with rbcL ＋ matK （83.3% species resolution）. We recommend evaluating the use of ITS for barcoding in other species. Low or single copy nuclear regions would provide more sophisticated barcoding tools in the long term, even though further research is required to find suitable loci. 展开更多
关键词 DNA barcoding ITS plastid candidates Primlula sect. Proliferae species discrimination.
Revisiting of Carex sect.Confertiflorae s.l.(Cyperaceae):New data from molecular and morphological evidence and first insights on Carex biogeography in East Asia 认领 引用 被引量：6
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作者 Yi-Fei Lu Xiao-Feng Jin +6 位作者 Hiroshi Ikeda Okihito Yano Carmen Benitez-Benitez Wei-Jie Chen Yong-Di Liu Pedro Jimenez-Mejias Ming-Jian Yu 《Journal of Systematics and Evolution》 SCIE CAS CSCD 2021年第4期668-686,共19页
Ccirex sect.Confertf/Iorae s.l.is a medium-sized species group(ca.40 species)with its center of diversity in E Asia(China and Japan).According to morphological traits,the section has been proposed to split into two se... Ccirex sect.Confertf/Iorae s.l.is a medium-sized species group(ca.40 species)with its center of diversity in E Asia(China and Japan).According to morphological traits,the section has been proposed to split into two sections(sects.Confertiflorae sensu Ohwi and Molliculae Ohwi)up to five different ones(sects.Confertiflorae s.s.,Molliculae,Dispalatae Ohwi,Ischnostachyae Ohwi,and Alliiformes Akiyama).Recent phylogenetic reconstructions showed Confertiflorae s.l.not to be monophyletic,as species traditionally considered part of it were found to belong to other clades,whereas species traditionally ascribed to other sections were nested within it.In this study,we investigated the phylogenetic structure,morphological affinities,and biogeographic history of sect.Confertiflorae s.l.We employed a taxon-based approach to explore the morphological affinities of the species considered in sect.Confertiflorae and compared the micromorphology of the nutlets of almost all the taxa using SEM.We included 40 samples representing 31 species/subspecies of sect.Confertiflorae s.l.and used two nuclear(ETS and ITS)and three plastid(trnL-F,matK,and rpl32-trnLUAC)molecular markers to reconstruct the phylogeny of the group.The phylogenetic analyses confirmed the polyphyly of sect.Confertiflorae s.l.,whose representatives were found within five distinct clades.From these,two clades,sect.Confertiflorae and sect.Molliculae,were found to be closely related and contained the majority of the species.The composition of the two dades agreed with the morphological structure of the group,and we confirmed an exclusive combination of features(namely color of basal sheaths,presence of bract sheath,peduncle of lowest spike,inflorescence sex distribution,shape of pistillate glume apex,and color and veins of utricle,among others)characterizing each of the two clades.The origin of the two clades was found to be in the early Pliocene;however,the majority of the diversification events within each clade took place during the Pleistocene.This illustrates that although Asia has been regarded as having little potential ecological space for Carex to diversify due to its climate stability,groups of sedges sub-endemic from that area may have a fairly recent origin related to glaciations.We proposed the rearrangement of sect.Confertiflorae as previously conceived as three independent sections:the monotypic Alliiformes,sect Molliculae,and sect.Paludosae. 展开更多
关键词 Carex eastern Asia integrative taxonomy scaffolding approach sect.Confertiflorae s.l. sectional delimitation
Phylogenetic relationships and biogeographic history of the unique Saxifraga sect.Irregulares(Saxifragaceae)from eastern Asia 认领 引用 被引量：4
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作者 Meng-Hua Zhang Chao-Yong Wang +4 位作者 Cheng Zhang Dai-Gui Zhang Ke-Gang Li Ze-Long Nie Ying Meng 《Journal of Systematics and Evolution》 SCIE CAS CSCD 2020年第6期958-971,共14页
Saxifraga L.is the largest genus in Saxifragaceae and a characteristic component of the herbaceous flora of the temperate and alpine mountains in the Northern Hemisphere.Section Irregulares is a small group of 15-20 s... Saxifraga L.is the largest genus in Saxifragaceae and a characteristic component of the herbaceous flora of the temperate and alpine mountains in the Northern Hemisphere.Section Irregulares is a small group of 15-20 species,representing one of the early-diverged lineages in the genus characterized with unique zygomorphic flowers.We used both nuclear internal transcribed spacer and chloroplast DNA regions(psbA-trnH,trnL-F,and matK)to reconstruct its species relationships,estimate divergence times,and infer its historical biogeography.Our phylogenetic results corroborate the monophyly of sect.Irregulares and its sister relationship to sect.Heterisia from North America.The section was well resolved into two lineages corresponding to their morphological features and biogeographic distributions.One represents ser.Stoloniferae including S.stolonifera Curtis and S.nipponica Makino with long-creeping stolonshizomes and small petals with spots and the other comprises the remaining taxa(ser.Rufescentes)which lack long-creeping rhizomes.Spots on leaves(abaxially spotted vs.abaxially without spots)and spots on petals(without spots vs.with spots)are inferred to be phylogenetically informative within ser.Rufescentes.Divergence time estimates and ancestral area analysis suggested a western North American origin of sect.Irregulares with migration into East Asia by way of the Bering land bridge in the Middle Oligocene.The development of drying and desertification belt in the late Miocene could have played an important role in the subsequent restriction and separation of the north and south lineages within eastern Asia. 展开更多
关键词 eastern Asia historical biogeography Saxifraga sect.Irregulares Saxifragaceae
A revision of Clematis sect.Atragene(Ranunculaceae) 认领 引用 被引量：5
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作者 Wen-Jing YANG Liang-Qian LI Lei XIE 《Journal of Systematics and Evolution》 SCIE CAS 北大核心 2009年第6期552-580,共29页
Clematis sect. Atragene is revised in this paper based on the examination of a large number of herbarium specimens, extensive field observations, and morphometric analyses. Brief taxonomic history and geographical dis... Clematis sect. Atragene is revised in this paper based on the examination of a large number of herbarium specimens, extensive field observations, and morphometric analyses. Brief taxonomic history and geographical distribution of the section are given, the relationships among the species are discussed, and the evolutionary trends of some characters in the section are evaluated. The staminodes of the plants in this section may have evolved from the outer stamens with petaloid filaments and gradually disappearing anthers. Subsequently, they may have evolved in two different ways. One possibility is that the staminodes elongate and become lanceolate, as long as sepals, and their apices turn into attenuate. The other is that the staminodes are spathulate, but not elongating, as long as stamens, and their apices turn into retuse from obtuse and rounded. The evolutionary trend of sepals may be from thin to thick in texture, and the veins from non-prominent to prominent. As a result, five new series are established and nine species, two subspecies and nine varieties （including three new ranks） are recognized in this section. An identification key is provided, and each taxon is described and illustrated. Clematis sibirica and Clematis ochotensis are treated as subspecies of Clematis alpina due to their subtle differences and lack of, or few, overlapping distributions. Clematis fusijamana and Clematisfauriei are recognized as varieties of C. alpina ssp. ochotensis for the continuous variation of the velutinous strips on the sepal margins. Clematis iliensis is treated as variety of C. alpina ssp. sibirica for the continuous variation of leaf division types. Extensive variations in sepal color and basal caruncle size support degrading Clematis chiisanensis as a variety of Clematis koreana. The North American ser. Occientales may be primitive, whereas ser. Macropetalae may be the most advanced taxon in this section. Ser. Alpinae and ser. Koreanae are closely related to each other. However, the systematic position of ser. Tomentosae cannot be determined based on morphological characters alone in the present study. 展开更多
关键词 Clematis sect. Atragene Ranunculaceae taxonomic revision.
A revision of Dryopteris sect.Diclisodon(Dryopteridaceae)based on morphological and molecular evidence with description of a new species 认领 引用 被引量：2
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作者 Zheng-Yu Zuo Ting Zhao +3 位作者 Xin-Yu Du Yun Xiong Jin-Mei Lu De-Zhu Li 《Plant Diversity》 SCIE CAS CSCD 2022年第2期181-190,共10页
Dryopteris sect.Diclisodon is a small section of ferns with about 12 species mainly distributed in East Asia.Here,we carried out morphological and phylogenetic analyses of this section.A new species from southwest Chi... Dryopteris sect.Diclisodon is a small section of ferns with about 12 species mainly distributed in East Asia.Here,we carried out morphological and phylogenetic analyses of this section.A new species from southwest China,D.gaoligongensis,is described and illustrated.Dryopteris gaoligongensis resembles D.indonesiana and D.sparsa,but differs by having a creeping rhizome and large 4-pinnate fronds.We also show that D.glabrior Ching&Z.Y.Liu is a distinct species;however,because it is a later homonym of D.glabrior Copel.,it should be renamed D.renchangiana.We conclude that a species previously known as D.nitidula,also an illegitimate homonym,should be recognized with a new name,D.sinonepalensis.We resolve the phylogenetic position of D.yoroii as sister to other sampled species of D.sect Diclisodon.Our phylogenetic analyses confirm the distinctiveness of D.gaoligongensis,D.renchangiana,and D.sinonepalensis.A key to species of D.sect Diclisodon in China is provided. 展开更多
关键词 Dryopteris gaotigongensis Dryopteris renchangiana Dryopteris sect.Nephrocystis Dryopteris sinonepalensis Molecular phylogeny Nomenclatural novelties
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Taxonomic revision of Lepisorus(J.Sm.) Ching sect.Lepisorus(Polypodiaceae) from China 认领 引用 被引量：2
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作者 Xin-Ping QI Xian-Chun ZHANG 《Journal of Systematics and Evolution》 SCIE CAS 北大核心 2009年第6期581-598,共18页
The taxonomy of Lepisorus （J. Sm.） Ching sect. Lepisorus in China was revised based on herbarium specimen examinations, field observations, and microscopic study of rhizome scales, soral paraphyses, leaf epidermis, ... The taxonomy of Lepisorus （J. Sm.） Ching sect. Lepisorus in China was revised based on herbarium specimen examinations, field observations, and microscopic study of rhizome scales, soral paraphyses, leaf epidermis, and spores. As a result, nine species were recognized： Lepisorus macrosphaerus （Baker） Ching, Lepisorus asterolepis （Baker） Ching, Lepisorus marginatus Ching, Lepisorus kuchenensis （Y.C. Wu） Ching, Lepisorus megasorus （C. Chr.） Ching, Lepisorus kawakamii （Hayata） Tagawa, Lepisorus subsessilis Ching ＆ Y.X. Lin, Lepisorus affinis Ching, and Lepisorus nudus （Hook.） Ching. Lepisorus kawakamii （Hayata） Tagawa was reinstated; Lepisorus gyirongensis Ching ＆ S.K. Wu and Lepisorus longus Ching were reduced to synonyms ofL. nudus and L. affinis, respectively. The subdivision ofLepisorus macrosphaerus was not accepted. Rhizome scales and paraphyses are the most useful characters for species delimitation as well as for infrageneric classification. Characteristics of the leaf epidermis and spore ornamentation are usually stable and thus of great significance in understanding the relationships among groups within the genus. 展开更多
关键词 China Lepisorus Lepisorus sect. Lepisorus Polypodiaceae taxonomic revision.
Distribution of Sect.Thea (L.) Dyer in Yunnan Province 认领 引用
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作者 汪云刚 刘本英 +7 位作者 宋维希 马玲 蒋会兵 矣兵 唐一春 李友勇 孙雪梅 王平盛 《Agricultural Science & Technology》 CAS 2011年第7期1067-1070,共4页
Yunnan is not only the center of tea origination but also the center of tea evolution and variation.There is a broad distribution of Sect.Thea（L.） Dyer in Yunnan.This paper concerns the research progress of Sect.The... Yunnan is not only the center of tea origination but also the center of tea evolution and variation.There is a broad distribution of Sect.Thea（L.） Dyer in Yunnan.This paper concerns the research progress of Sect.Thea（L.） Dyer,reveals the distribution of Sect.Thea（L.） Dyer in Yunnan,and checks out the number and name of Sect.Thea（L.） Dyer in Yunnan,which will offer references for further study and application of tea plants. 展开更多
关键词 Yunnan Sect.Thea（L.） Dyer Distribution Species and Variety
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Cytotaxonomy and Cytogeography of Vicia sect. Vicilla in Northeast of China 认领 引用
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作者 刘祥君 张大维 李瑞军 《Journal of Forestry Research》 CAS 1998年第1期19-26,共8页
Vicia amirensis has pollen grain with swollen mesocipium, terete style, abaxially sprouting stylar hairs and globes stigma, differing from other five species,V. amoena, V. japonica, V. pseudo-orbus, V. ramuliflora, V.... Vicia amirensis has pollen grain with swollen mesocipium, terete style, abaxially sprouting stylar hairs and globes stigma, differing from other five species,V. amoena, V. japonica, V. pseudo-orbus, V. ramuliflora, V. unijuga andV. venosa, in sect.Vicilla of Kupicha’s System. This result further support taxonomic treatmentV. amurensis proposed by Endo and Ohash. The chromosome numbers of 64 populations and karyotypes of 15 populations for sect.Vicilla and sect.Amurense were observed.V. amurensis andV. psendo-orbus have similar karyotype features such as the same karyotype symmetry, comparable chromosome size and the same type, of Sat-chromosomes, and thereforeV. amurensis in seet.Amurense is assumed to be closely related toV. japonica in sect.Vicilla. The primary study of nuclear DNA amount was carried out on nine populations of six taxa in sect.Vicilla in China. It is primarily discussed that evolutionary trend of karyotype, nuclear DNA amount in sect.Vicilla and geographic distribution of different ploidy cytotypes. 展开更多
关键词 Vicia sect.Vicilla Sect.Amurense Karyotype Nuclear DNA content Cytogeography Cytotaxonomy
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Molecular identification of species in Prunus sect. Persica (Rosaceae), with emphasis on evaluation of candidate barcodes for plants 认领 引用 被引量：6
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作者 Xu QUAN Shi-Liang ZHOU 《Journal of Systematics and Evolution》 SCIE CAS CSCD 北大核心 2011年第2期138-145,共8页
Species of Prunus L. sect. Persica are not only important fruit trees, but also popular ornamental and medicinal plants. Correct identification of seedlings, barks, or fruit kernels is sometimes required, but no relia... Species of Prunus L. sect. Persica are not only important fruit trees, but also popular ornamental and medicinal plants. Correct identification of seedlings, barks, or fruit kernels is sometimes required, but no reliable morphological characters are available. Nowadays, the technique of DNA barcoding has the potential to meet such requirements. In this study, we evaluated the suitability of 11 DNA loci （atpB-rbcL, trnH-psbA, trnL-F, trnS-G, atpF-H, rbcL, matK, rpoB, rpoC1, nadl, and internal transcribed spacer [ITS]） as candidate DNA barcodes for peaches, using samples from 38 populations, covering all the species in sect. Persica. On the whole, the primers worked well in this group and sequencing difficulties were met only in the case of ITS locus. Five loci （rbcL, matK, rpoB, rpoC, and nadl ） have very low variation rates, whereas atpB-rbcL, atpF-H, trnH-psbA, trnL-F and trnS-G show more variability. The most variable loci, atpB-rbcL and trnH-psbA, can distinguish three of the five species. Two two-locus combinations, atpB-rbcL＋trnL-F and atpB-rbcL＋atpF-H, can resolve all five species. We also find that identification powers of the loci are method-dependent. The NeighborNet method shows higher species identification power than maximum parsimony, neighbor joining, and unweighted pair group method with arithmetic mean methods. Key words atpB-rbcL, DNA barcode, Prunus sect. Persica, trnL-F. 展开更多
关键词 atpB-rbcL DNA barcode Prunus sect. Persica trnL-F.
中国茜草属sect.Oligoneura的形态计量学研究 认领 引用 被引量：1
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作者 杨丽娥 孟盈 +1 位作者 聂泽龙 孙航 《广西植物》 CAS CSCD 北大核心 2017年第7期829-840,共12页
茜草属为茜草科模式属,全球约80种,中国有近一半的物种,是茜草属的重要分布中心,大部分隶属于sect.Oligoneura。但是,该组内各种间的形态特征错综复杂,依靠单个性状不易划定种间界限。该研究在全面衡量sect.Oligoneura组内各种间形态特... 茜草属为茜草科模式属,全球约80种,中国有近一半的物种,是茜草属的重要分布中心,大部分隶属于sect.Oligoneura。但是,该组内各种间的形态特征错综复杂,依靠单个性状不易划定种间界限。该研究在全面衡量sect.Oligoneura组内各种间形态特征的基础上,选取该组20种共171份标本,对其3个数量性状和28个定性性状进行聚类分析和主成分分析。结果表明:在主成分分析中,前3个主成分累积贡献率有46.88%,性状的累积贡献率增长并不明显,但该结果仍与聚类分析结果一致。对前3个主成分贡献较大的特征包括叶形(叶长宽比)、叶柄长度、叶脉、每轮叶片数和生活型等,这些形态性状也是该属传统分类学中重要的物种鉴定特征。该研究结果与分子系统发育结果基本一致,支持该组内ser.Chinenses、R.mandersii group、R.angustissima group和R.siamensis group类群的划分,但并不支持ser.Cordifoliae单独成系。sect.Oligoneura内除少数物种外,大部分物种界限均比较清晰。形态计量学研究为sect.Oligoneura甚至茜草属的物种鉴定与划分提供了重要的参考意义。 展开更多
关键词 茜草属 sect.Oligoneura 聚类分析 主成分分析
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Fruit Anatomy of sect. Paracamellia with Reference to Their Significance of Germplasm Resources Exploitation 认领 引用 被引量：1
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作者 洪思思 张斯敏 +3 位作者 楼嘉 张薇 吕洪飞 廖芳蕾 《Agricultural Science & Technology》 CAS 2011年第5期643-646,共4页
[Objective] To utilize the germplasm resources,new systematic evidence for the classification of sect.Paracamellia,genus Camellia is found in this article.[Method] Fruit anatomy of 10 species representing sect.Paracam... [Objective] To utilize the germplasm resources,new systematic evidence for the classification of sect.Paracamellia,genus Camellia is found in this article.[Method] Fruit anatomy of 10 species representing sect.Paracamellia was investigated.And the main component of sect.Paracamellia in the genus Camellia was studied by MVSP software.[Result] The exocarp was thin;mesocarp was broad,having a large number of stone cells;endocarp was lignified,and separated easily from seed.The principle components analysis suggested that the distance between species was far,showing far relation;the current study did not support the formation of Camellia grijsii（C.grijsii）and Camellia yuhsienensis（C.yuhsienensis）,Camellia shensiensis（C.shensiensis）should not be recognized as a variety of C.yuhsienensis.In addition,it also proved Ming＇s combining of Camellia confusa（C.confusa）and Camellia kissi（C.kissi）was unnatural.[Conclusion] The study provided theoretical basis for the development and application of sect.Paracamellia in the genus Camellia. 展开更多
关键词 Genus Camellia Sect.Paracamellia Fruit anatomy Classification Germplasm resources
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What is Allium paniculatum? Establishing taxonomic and molecular phylogenetic relationships within A. sect. Codonoprasum 认领 引用
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作者 Cristina Salmeri Cristian Brullo +2 位作者 Salvatore Brullo Giampietro Giusso Del Galdo Ivan I. Moysiyenko 《Journal of Systematics and Evolution》 SCIE CAS CSCD 2016年第2期123-134,共12页
Allium paniculatum L. is commonly recorded from the Euro-Mediterranean and Irano-Turanian regions. Evidence from literature and herbarium collections revealed that many different taxa of A. sect. Codonoprasum Rchb., a... Allium paniculatum L. is commonly recorded from the Euro-Mediterranean and Irano-Turanian regions. Evidence from literature and herbarium collections revealed that many different taxa of A. sect. Codonoprasum Rchb., all characterized by big size, diffuse and densely flowered umbrella, very long spathe valves, long pedicels, and cylindrical-campanulate perigon, have been wrongly attributed to this species thus affecting records on its geographic distribution and morphological characterization. In order to define the true identity of A. paniculatum, we analyzed specimens coming from the type locality （Don River）, and provided details on morphology, ecology, karyology, leaf anatomy, seed morphology and seed coat micro-sculpturing. Taxonomic and phylogenetic relationships with related species of sect. Codonoprasum and with other taxa of different sections were investigated by means of morphological characters and molecular data from the internal transcribed spacers （ITS） nrDNA and the trnH-psbA cpDNA region. Maximum parsimony and Bayesian inference analyses of molecular data recovered two main clades in A. sect. Codonoprasum and clearly separated A. paniculatum from related taxa. The taxonomic implications of these patterns of relationships are discussed. To our knowledge, this is the first study documenting in-depth phylogenetic relationships within A. sect. Codonoprasum. 展开更多
关键词 Allium paniculatum A. sect. Codonoprasum karyology morphology phylogeny seed coat sculpturing taxonomy.
Circumscriptions and Phylogenetic Relationships of Primula Sects. Auganthus and Ranunculoides: Evidence from nrDNA ITS Sequences 认领 引用 被引量：4
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作者 郝刚 胡启明 李南淑 《Acta Botanica Sinica》 2002年第1期72-75,共4页
The circumscriptions of sections Auganthus Pax ex Balf. f. and Ranunculoides Chen et C. M. Hu in the genus Primula L. have been controversial, due to the different treatments of P. filchnerae Knuth. We conducted a phy... The circumscriptions of sections Auganthus Pax ex Balf. f. and Ranunculoides Chen et C. M. Hu in the genus Primula L. have been controversial, due to the different treatments of P. filchnerae Knuth. We conducted a phylogenetic analysis using sequences from the ITS region of nuclear ribosomal DNA. All five species of these two sections and some representatives of other related sections were sampled. The ITS trees show that P. filchnerae could be convincingly placed in sect. Auganthus , together with P. sinensis Sabine ex Lindl. and P. rupestris Balf. f. et Farrer, whereas sect. Ranunculoides contains two species: P. cicutariifolia Pax and P. merrilliana Schltr. These two sections are distantly related and their association with other sections needs further studies. This study also demonstrated that ITS sequences would be a suitable marker for the reconstruction of Primula phylogeny. 展开更多
关键词 Primula sect. Auganthus sect. Ranunculoides Phylogeny ITS Primulaceae
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Addressing schistosomiasis in the Philippines:Need for a coordinated intersectoral effort 认领 引用
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作者 Alvin I.Abeleda Don Eliseo Lucero-PrisnoⅢ Jerico B.Ogaya 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2025年第5期239-240,共2页
To the Editor:Abeleda et al.[1]recently argued in a perspective article that the Philippines should do better in order to achieve its goal of reducing schistosomiasis incidence to zero in humans,animals,and snails by ... To the Editor:Abeleda et al.[1]recently argued in a perspective article that the Philippines should do better in order to achieve its goal of reducing schistosomiasis incidence to zero in humans,animals,and snails by 2025[2,3].The authors appropriately ascribed the need to ramp up surveillance,WASH(water,sanitation,and hygiene),and veterinary efforts.In this letter,I would like to add to the discussion that the key to achieving schistosomiasis elimination may be strengthening the veterinary public health sector and framing mitigation efforts within the One Health lens.Schistosoma(S.)japonicum infection is a zoonotic disease and it affects more than 40 species of animals,including livestock animals like cattle,pigs,and water buffaloes,and pets like dogs[4].In the Philippines,the prevalence of infection in animal reservoirs remains largely unknown in most endemic areas due to the lack of concerted epidemiological efforts unlike what is being done in human hosts.In areas where studies have been done,infection rates are from less than 10%to 97%in water buffaloes tested[5-7].Indeed,as Abeleda et al.[1]argued,there is a need to do better on this front. 展开更多
关键词 Schistosomiasis Epidemiological Efforts Veterinary Public Health Water Buffaloes Zoonotic Disease One Health Animal Reservoirs strengthening veterinary public health sect
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双能量CT混合图像结合3mL/s对比剂团注速度在胸腹部增强检查中对腋静脉区域对比剂伪影的优化价值评估 认领 引用 被引量：1
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作者 王晓 陆晓平 +5 位作者 张鹏 秦瑞遥 郑福玲 高鑫 薛华丹 王沄 《CT理论与应用研究（中英文）》 2026年第4期789-797,共9页
目的:通过比较双能量CT(DECT)与单能量CT(SECT)搭配不同对比剂团注速度在胸腹增强检查中动脉期腋静脉对比剂硬化伪影的大小,评估其临床应用价值。方法:回顾性收集2024年1月至2024年11月同一受检者在我院先后分别接受双能量扫描(实验组)... 目的:通过比较双能量CT(DECT)与单能量CT(SECT)搭配不同对比剂团注速度在胸腹增强检查中动脉期腋静脉对比剂硬化伪影的大小,评估其临床应用价值。方法:回顾性收集2024年1月至2024年11月同一受检者在我院先后分别接受双能量扫描(实验组)和单能量扫描(对照组)的胸腹增强CT检查77例,对比两组图像动脉期腋静脉硬化伪影、动脉强化程度、图像信噪比(SNR)及对比噪声比(CNR)、硬化伪影主观评价、图像质量主观评价方面的差异。硬化伪影和图像质量主观评分由两位放射科医师独立完成。结果:实验组腋静脉硬化伪影客观评价显著低于对照组,实验组动脉CT值高于对照组。实验组图像在不受硬化伪影影响的区域骨骼、肌肉、脂肪组织的SNR和CNR均不低于对照组,但辐射剂量远低于对照组。腋静脉硬化伪影主观评分方面实验组优于对照组。腋静脉硬化伪影区域外图像质量主观评分实验组不低于对照组。两位观察者评分一致性较高。结论:双能量CT混合图像结合3 mL/s对比剂团注速度在胸腹部增强检查中,能够显著的降低对比剂硬化伪影干扰,提高图像质量,降低辐射剂量,具有更好的临床应用价值。 展开更多
关键词 双能量CT 单能量CT 硬化伪影 胸腹增强CT 图像质量 动脉期
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Late Eocene leaves of Nageia(section Dammaroideae)from Maoming Basin,South China and their implications on phytogeography 认领 引用 被引量：3
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作者 Xiao-Yan Liu Qi Gao Jian-Hua Jin 《Journal of Systematics and Evolution》 SCIE CAS CSCD 2015年第4期297-307,共11页
A new species of Nageia,Nageia maomingensis sp.nov.,is described from the Late Eocene of Maoming Basin,Guangdong Province,South China.According to its cuticular characteristics,the present fossil species is assigned t... A new species of Nageia,Nageia maomingensis sp.nov.,is described from the Late Eocene of Maoming Basin,Guangdong Province,South China.According to its cuticular characteristics,the present fossil species is assigned to N.sect.Dammaroideae,showing the most resemblance to the extant species N.motleyi(Parl.)de Laub.At present,this section is mainly distributed in the Pacific islands region from South Asia to New Guinea.The discovery of N.maomingensis demonstrates that plants of this section inhabited South China at least by the Eocene.The distribution and living habitat of extant N.sect.Dammaroideae imply that South China was warmer during the Late Eocene than today,and may represent one of the centers for early diversification of Nageia and its section Dammaroideae during the Eocene.In addition,we postulate that plants of sect.Oammaroideae migrated southward in response to climate cooling after the Eocene. 展开更多
关键词 Late Eocene Maoming Basin Nageia sect.Dammaroideae phytogeography South China.
Pollen Morphology of Pedicularis sect.Cyathophora,a Group Endemic to the Eastern Himalaya-Hengduan Mountains Region 认领 引用 被引量：3
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作者 Wen-Bin Yu Hong Wang 《Journal of Integrative Plant Biology》 SCIE CAS 2008年第2期244-252,共9页
Pedicularis sect. Cyathophora is a distinctive group endemic to the eastern Himalaya-Hengduan Mountains region. It was regarded as a ＇grex＇ or section and included all four general corolla types of Pedicularis. A un... Pedicularis sect. Cyathophora is a distinctive group endemic to the eastern Himalaya-Hengduan Mountains region. It was regarded as a ＇grex＇ or section and included all four general corolla types of Pedicularis. A unique feature of it is that the leaf and bract bases are fused together to form a cup-like structure around the stem at each node. Pollen morphology of seven species in sect. Cyathophora was investigated by scanning electron microscopy （SEM） and light microscopy （LM）. Two different pollen apertures could be distinguished （i.e. trisyncolpate and bisyncolpate） using LM, while examination with SEM made it possible to recognize three types of exine ornamentation （i.e. microscabrate, microfoveolate and microreticulate）. The microfoveolate exine ornamentation was found in trisyncolpate pollen grains for the first time. Possible relationships between pollen data and the corolla types were discussed. Comparisons of floral and phyllotaxy characters of the genus Pedicularis, together with the pollen characters of sect. Cyathophora, could help us to better understand the evolutionary trends in Pedicularis. 展开更多
关键词 eastern Himalaya Hengduan Mountains Pedicualns pollen morphology sect. Cyathophora.
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线柱兰开花特性与繁育系统 认领 引用
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作者 叶晓霞 彭月焕 +5 位作者 陈以 周惠萍 罗珍 赖世秋 覃梦宇 朱明裕 《植物生理学报》 CAS CSCD 北大核心 2026年第6期590-600,共11页
通过系统观测线柱兰的花部特征、开花动态及访花昆虫行为,结合不同开花时期的花粉活力与柱头可授性测定,并通过杂交指数(OCI)评估与人工控制授粉试验,判定其繁育系统类型。结果表明:线柱兰群体花期为1月中旬至3月下旬,单花花期为10~12 d... 通过系统观测线柱兰的花部特征、开花动态及访花昆虫行为,结合不同开花时期的花粉活力与柱头可授性测定,并通过杂交指数(OCI)评估与人工控制授粉试验,判定其繁育系统类型。结果表明:线柱兰群体花期为1月中旬至3月下旬,单花花期为10~12 d;盛花期花粉活力最强,柱头可授性与花粉活力在时间上出现重叠期,传粉者多样性低,仅记录到蓟马一种访花昆虫。杂交指数值为2,表明线柱兰为自交亲和;人工控制授粉实验进一步判定其繁育系统属兼性自交型,同时仍保留较强异交能力。研究结果证实线柱兰通过花粉活力与柱头可授性的时间重叠以延长有效授粉期,并采取兼性自交与无融合生殖相结合的“双保险”繁殖机制,是应对传粉者稀缺与人为干扰生境的适应策略,为进一步理解兰科植物在干扰生境下的繁殖适应策略提供参考。 展开更多
关键词 线柱兰 开花特性 繁育系统 花粉活力 访花昆虫
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