Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum

doi:10.1007/s10265-008-0186-4

	Photosynthetic performance along a light gradient as related to leaf characteristics of a naturally occurring Cypripedium flavum
	Li, Zhongrong 1,2; Zhang, Shibao1 ; Hu, Hong1 ; Li, Dezhu1
通讯作者	huhong@mail.kib.ac.cn
	2008-11-01
发表期刊	JOURNAL OF PLANT RESEARCH
ISSN	0918-9440
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
学科领域	Plant Sciences
DOI	10.1007/s10265-008-0186-4
收录类别	SCI
语种	英语
WOS记录号	WOS:000260664800003
引用统计
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
推荐引用方式 GB/T 7714	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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