Sun leaves up-regulate the photorespiratory pathway to maintain a high rate of CO2 assimilation in tobacco

doi:10.3389/fpls.2014.00688

	Sun leaves up-regulate the photorespiratory pathway to maintain a high rate of CO2 assimilation in tobacco
	Huang,Wei; Zhang,Shi-Bao; Hu,Hong; Huang,W (reprint author),Chinese Acad Sci,Inst Bot,Key Lab Econ Plants & Biotechnol,132 Lanhei Rd,Kunming 650201,Yunnan,Peoples R China.; huangwei@mail.kib.ac.cn
	2014
发表期刊	FRONTIERS IN PLANT SCIENCE
卷号	5 页码:688
摘要	The greater rate of CO2 assimilation (A(n)) in sun-grown tobacco leaves leads to lower intercellular and chloroplast CO2 concentrations and, thus, a higher rate of oxygenation of ribulose-1,5-bisphosphate (RuBP) than in shade-grown leaves. Impairment of the photorespiratory pathway suppresses photosynthetic CO2 assimilation. Here, we hypothesized that sun leaves can up-regulate photorespiratory pathway to enhance the A(n) in tobacco. To test this hypothesis, we examined the responses of photosynthetic electron flow (J(T)) and CO2 assimilation to incident light intensity and intercellular CO2 concentration (CO in leaves of 'k326' tobacco plants grown at 95% sunlight (sun plants) or 28% sunlight (shade plants). The sun leaves had higher photosynthetic capacity and electron flow devoted to RuBP carboxylation (Jo) than the shade leaves. When exposed to high light, the higher Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) content and lower C-i in the sun leaves led to greater electron flow devoted to RuBP oxygenation (J(o)). The J(o)/J(C) ratio was significantly higher in the sun leaves than in the shade leaves under strong illumination. As estimated from CO2-response curves, the maximum J(o) was linearly correlated with the estimated Rubisco content. Based on light-response curves, the light-saturated J(o) was linearly correlated with light-saturated J(T) and light-saturated photosynthesis. These findings indicate that enhancement of the photorespiratory pathway is an important strategy by which sun plants maintain a high A(n).
关键词	Co2 Assimilation Light Acclimation Photorespiratory Pathway Rubp Carboxylation Rubp Regeneration
学科领域	Plant Sciences
DOI	10.3389/fpls.2014.00688
收录类别	SCI
语种	英语
WOS记录号	WOS:000347699900001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/19365
专题	资源植物与生物技术所级重点实验室
通讯作者	Huang,W (reprint author),Chinese Acad Sci,Inst Bot,Key Lab Econ Plants & Biotechnol,132 Lanhei Rd,Kunming 650201,Yunnan,Peoples R China.; huangwei@mail.kib.ac.cn
推荐引用方式 GB/T 7714	Huang,Wei,Zhang,Shi-Bao,Hu,Hong,et al. Sun leaves up-regulate the photorespiratory pathway to maintain a high rate of CO2 assimilation in tobacco[J]. FRONTIERS IN PLANT SCIENCE,2014,5:688.
APA	Huang,Wei,Zhang,Shi-Bao,Hu,Hong,Huang,W ,&huangwei@mail.kib.ac.cn.(2014).Sun leaves up-regulate the photorespiratory pathway to maintain a high rate of CO2 assimilation in tobacco.FRONTIERS IN PLANT SCIENCE,5,688.
MLA	Huang,Wei,et al."Sun leaves up-regulate the photorespiratory pathway to maintain a high rate of CO2 assimilation in tobacco".FRONTIERS IN PLANT SCIENCE 5(2014):688.

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