Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum
Li, Zhongrong1,2; Zhang, Shibao1; Hu, Hong1; Li, Dezhu1
2008-11-01
发表期刊JOURNAL OF PLANT RESEARCH
ISSN0918-9440
卷号121期号:6页码:559-569
摘要Photosynthesis, leaf structure, nitrogen content and nitrogen allocation in photosynthetic functions of Cypripedium flavum were studied in a naturally varying light regime. Light-saturated leaf net photosynthetic rate (A (max)) was strongly correlated with leaf dry mass per area (LMA), mesophyll conductance (g (m)) and area-based leaf nitrogen content (N-area), with all variables increasing with increasing irradiance. Such coordinate variation of all these parameters illustrates the plastic response of leaf structure to high light (HL). Leaf N-area was greater under HL than in low light (LL). The fractions of leaf nitrogen partitioning in carboxylation (P (R)) and bioenergetics (P (B)) were positively related to LMA. In contrast, P (R) and P (B) decreased with increasing mass-based leaf nitrogen content (N-mass). However, no correlation was found between leaf nitrogen investment in light harvesting (P (L)) and either LMA or N-mass. Like maximum rate of carboxylation (V (cmax)) and electron transport (J (max)), the J (max)/V (cmax) ratio, which was strongly correlated to LMA, also increased significantly with irradiance. Under HL, leaf maximum photosynthetic nitrogen efficiency (ANUE) and intrinsic water use efficiency (WUE) were greater than in LL conditions, despite a small difference in WUE. This suggests that a functional balance in the photosynthetic machinery favors leaf photosynthetic plasticity of C. flavum in response to different light conditions. Given an ample soil nitrogen supply, C. flavum may offset its susceptibility to HL by efficient nitrogen use and higher stomatal and mesophyll conductance against photoinhibition so as to keep leaf photosynthesis positive.
关键词Cypripedium Flavum Endangered Species Leaf Dry Mass Per Area Leaf Nitrogen Partitioning Mesophyll Conductance Photosynthetic Light Responses
资助信息This work was funded by NSFC (no. 30470182, 30770225, 30770226), Knowledge Innovation Project (no. KSCX2-YW-Z-033) and West Light Foundation of CAS, and National Project for Sci-Tech Construction Platform (no.2005DRA21006). We thank Dr Ulo Niinemets for clarifying the model of leaf nitrogen partitioning. We also thank Mr. Kun Xu for offering help and Professor Azza Tawfik for improving the English. During the study, we were greatly supported by Mr. Zhengdong Fang and his co-workers from the Shangri-la Alpine Botanic Garden. The anonymous reviewers were acknowledged for their helpful comments on the manuscript.
学科领域Plant Sciences
DOI10.1007/s10265-008-0186-4
收录类别SCI
语种英语
WOS研究方向Plant Sciences
WOS类目Plant Sciences
WOS记录号WOS:000260664800003
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/2469
专题资源植物与生物技术所级重点实验室
作者单位1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
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Li, Zhongrong,Zhang, Shibao,Hu, Hong,et al. Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum[J]. JOURNAL OF PLANT RESEARCH,2008,121(6):559-569.
APA Li, Zhongrong,Zhang, Shibao,Hu, Hong,&Li, Dezhu.(2008).Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum.JOURNAL OF PLANT RESEARCH,121(6),559-569.
MLA Li, Zhongrong,et al."Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum".JOURNAL OF PLANT RESEARCH 121.6(2008):559-569.
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