Photorespiration plays an important role in the regulation of photosynthetic electron flow under fluctuating light in tobacco plants grown under full sunlight

doi:10.3389/fpls.2015.00621

	Photorespiration plays an important role in the regulation of photosynthetic electron flow under fluctuating light in tobacco plants grown under full sunlight
	Huang, Wei; Hu, Hong; Zhang, Shi-Bao
	2015-08-11
发表期刊	FRONTIERS IN PLANT SCIENCE
卷号	6
摘要	Plants usually experience dynamic fluctuations of light intensities under natural conditions. However, the responses of mesophyll conductance, CO2 assimilation, and photorespiration to light fluctuation are not well understood. To address this question, we measured photosynthetic parameters of gas exchange and chlorophyll fluorescence in tobacco leaves at 2-min intervals while irradiance levels alternated between 100 and 1200 mu mol photons m(-2) s(-1). Compared with leaves exposed to a constant light of 1200 mu mol photons m(-2) s(-1), both stomatal and mesophyll conductances were significantly restricted in leaves treated with fluctuating light condition. Meanwhile, CO2 assimilation rate and electron flow devoted to RuBP carboxylation at 1200 mu mol photons m(-2) s(-1) under fluctuating light were limited by the low chloroplast CO2 concentration. Analysis based on the C3 photosynthesis model indicated that, at 1200 mu mol photons m(-2) s(-1) under fluctuating light, the CO2 assimilation rate was limited by RuBP carboxylation. Electron flow devoted to RuBP oxygenation at 1200 mu mol photons m(-2) s(-1) under fluctuating light remained at nearly the maximum level throughout the experimental period. We conclude that fluctuating light restricts CO2 assimilation by decreasing both stomatal and mesophyll conductances. Under such conditions, photorespiration plays an important role in the regulation of photosynthetic electron flow.
关键词	Co2 Assimilation Fluctuating Light Photorespiration Photosynthetic Electron Flow Mesophyll Conductance
DOI	10.3389/fpls.2015.00621
收录类别	SCI
语种	英语
WOS记录号	WOS:000359912300002
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/25103
专题	资源植物与生物技术所级重点实验室
推荐引用方式 GB/T 7714	Huang, Wei,Hu, Hong,Zhang, Shi-Bao. Photorespiration plays an important role in the regulation of photosynthetic electron flow under fluctuating light in tobacco plants grown under full sunlight[J]. FRONTIERS IN PLANT SCIENCE,2015,6.
APA	Huang, Wei,Hu, Hong,&Zhang, Shi-Bao.(2015).Photorespiration plays an important role in the regulation of photosynthetic electron flow under fluctuating light in tobacco plants grown under full sunlight.FRONTIERS IN PLANT SCIENCE,6.
MLA	Huang, Wei,et al."Photorespiration plays an important role in the regulation of photosynthetic electron flow under fluctuating light in tobacco plants grown under full sunlight".FRONTIERS IN PLANT SCIENCE 6(2015).

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