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Plastome structure,divergence time,and C4 photosynthesis evolution in Chenopodiaceae s.s. 认领 引用
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作者 Shuai Liu Qiumei Cao +6 位作者 Giovanni Zecca Fabrizio Grassi Alexander P.Sukhorukov Mariyo Boboev Parvina Kurbonova Hikmat Hisoriev Zhibin Wen 《Journal of Systematics and Evolution》 SCIE CSCD 2026年第4期643-662,共20页
Chenopodiaceae s.s.(Amaranthaceae s.l.)contains the largest number of C4 species among eudicots.Despite this,plastome evolution within this family has been investigated in only a few species.Here,we analyzed 119 pl... Chenopodiaceae s.s.(Amaranthaceae s.l.)contains the largest number of C4 species among eudicots.Despite this,plastome evolution within this family has been investigated in only a few species.Here,we analyzed 119 plastomes from 115 species,including 78 newly sequenced plastomes,representing all subfamilies and most C4 lineages of Chenopodiaceae s.s.Plastome structural variants,rearrangements,and codon usage bias were compared across subfamilies and photosynthetic types.Multiple phylogenetic approaches were employed to reconstruct the evolutionary relationships within Chenopodiaceae s.s.,and Bayesian divergence time estimation was performed.Various Mk models for discrete character evolution were tested to investigate the evolution of C4 photosynthesis,and stochastic character mapping simulations were used to reconstruct shifts in photosynthetic pathways through time.Several plastome structural variants and rearrangements were identified,but associations with photosynthetic types were observed only in the subfamily Suaedoideae.Codon usage bias analysis revealed significant bias exclusively in C4 species,suggesting enhanced translational efficiency and accuracy as an adaptation to environmental conditions.We inferred multiple independent origins of the C4 pathway,with the oldest lineages—Bienertia(Suaedoideae)and Caroxyleae(Salsoloideae)—dating to approximately 34 and 32 million years ago(Ma),respectively,during the Oligocene.A marked increase in the number of C4 lineages occurred between 20 and 15 Ma.Declining atmospheric CO2 concentrations,combined with genetic,ecological,and environmental factors,likely promoted the expansion of C4 photosynthesis until recently.Finally,we identified five new hypervariable regions that will be valuable for phylogenetic and DNA barcoding applications in Chenopodiaceae s.s. 展开更多
关键词 C4photosynthesis Chenopodiaceae s.s. chloroplast genome codon bias evolution IR/SC boundary
Sc:In:Fe:LiNbO_3晶体的生长及全息关联存储的研究 认领 引用
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作者 荣宪伟 刘欣荣 +1 位作者 李德敏 关承祥 《人工晶体学报》 EI CAS 北大核心 2006年第1期143-146,共4页
在Fe:LiNbO3中掺进Sc2O3和In2O3采用Czochralski技术生长Sc:In:Fe:LiNbO3晶体。测试Sc:In:Fe:LiNbO3晶体的红外光谱和抗光致散射能力。Sc(1mol%):In(2mol%):Fe:LiNbO3晶体OH-吸收峰移到3508cm-1,抗光致散射能力比Fe:LiNbO3晶体提高二个... 在Fe:LiNbO3中掺进Sc2O3和In2O3采用Czochralski技术生长Sc:In:Fe:LiNbO3晶体。测试Sc:In:Fe:LiNbO3晶体的红外光谱和抗光致散射能力。Sc(1mol%):In(2mol%):Fe:LiNbO3晶体OH-吸收峰移到3508cm-1,抗光致散射能力比Fe:LiNbO3晶体提高二个数量级。对Sc(1mol%):In(2mol%):Fe:LiNbO3晶体OH-吸收峰移动机理和抗光致散射能力增强的机理进行讨论。以Sc(1mol%):In(2mol%):Fe:LiNbO3晶体作存储元件,以Cu:KNSBN晶体作为位相共轭镜进行全息关联存储,试验结果表明全息关联存储的成象质量高、图象清晰完整、噪音小。 展开更多
关键词 Sc:In:Fe:LiNbO3晶体 全息关联存储 红外光谱
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