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题名: Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum
作者: Li, Zhongrong1, 2; null(张石宝)1; Hu, Hong1; null(李德铢)1
刊名: JOURNAL OF PLANT RESEARCH
关键词: Cypripedium flavum ; Endangered species ; Leaf dry mass per area ; Leaf nitrogen partitioning ; Mesophyll conductance ; Photosynthetic light responses
英文摘要: 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.
出版日期: 2008-11-01
卷号: 121, 期号:6, 页码:559-569
DOI标识: 10.1007/s10265-008-0186-4
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0918-9440
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2469
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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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

Recommended Citation:
Li, ZR; Zhang, SB; Hu, H; Li, DZ.Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum,JOURNAL OF PLANT RESEARCH,2008,121(6):559-569
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