The Sclerophyllous Eucalyptus camaldulensis and Herbaceous Nicotiana tabacum Have Different Mechanisms to Maintain High Rates of Photosynthesis

	The Sclerophyllous Eucalyptus camaldulensis and Herbaceous Nicotiana tabacum Have Different Mechanisms to Maintain High Rates of Photosynthesis
	Huang, Wei ; Tong, You-Gui ; Yu, Guo-Yun
刊名	FRONTIERS IN PLANT SCIENCE
	2016
卷号	7 期号:1769
关键词	alternative electron flow CO2 assimilation mesophyll conductance photorespiration sclerophyllous
中文摘要	It is believed that high levels of mesophyll conductance (gm) largely contribute to the high rates of photosynthesis in herbaceous C-3 plants. However, some sclerophyllous 03 plants that display low levels of gm have high rates of photosynthesis, and the underlying mechanisms responsible for high photosynthetic rates in sclerophyllous 03 plants are unclear. In the present study, we examined photosynthetic characteristics in two high-photosynthesis plants (the sclerophyllous Eucalyptus camaldulensis and the herbaceous Nicotiana tabacum) using measurements of gas exchange and chlorophyll fluorescence. Under saturating light intensities, both species had similar rates of 002 assimilation at 400 mu mol mol(-1) CO2 (A(400)). However, E. camaldulensis exhibited significantly lower g(m) and chloroplast CO2 concentration (C-C) than N. tabacum. A quantitative analysis revealed that, in E. camaldulensis, the g(m) limitation was the most constraining factor for photosynthesis. By comparison, in N. tabacum, the biochemical limitation was the strongest, followed by g(m) and g(S) limitations. In conjunction with a lower C-C, E. camaldulensis up-regulated the capacities of photorespiratory pathway and alternative electron flow. Furthermore, the rate of alternative electron flow was positively correlated with the rates of photorespiration and ATP supply from other flexible mechanisms, suggesting the important roles of photorespiratory pathway, and alternative electron flow in sustaining high rate of photosynthesis in E. camaldulensis. These results highlight the different mechanisms used to maintain high rates of photosynthesis in the sclerophyllous E. camaldulensis and the herbaceous N. tabacum.
公开日期	2016-12-16
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/10170]
专题	西双版纳热带植物园_其他
推荐引用方式 GB/T 7714	Huang, Wei,Tong, You-Gui,Yu, Guo-Yun. The Sclerophyllous Eucalyptus camaldulensis and Herbaceous Nicotiana tabacum Have Different Mechanisms to Maintain High Rates of Photosynthesis[J]. FRONTIERS IN PLANT SCIENCE,2016,7(1769).
APA	Huang, Wei,Tong, You-Gui,&Yu, Guo-Yun.(2016).The Sclerophyllous Eucalyptus camaldulensis and Herbaceous Nicotiana tabacum Have Different Mechanisms to Maintain High Rates of Photosynthesis.FRONTIERS IN PLANT SCIENCE,7(1769).
MLA	Huang, Wei,et al."The Sclerophyllous Eucalyptus camaldulensis and Herbaceous Nicotiana tabacum Have Different Mechanisms to Maintain High Rates of Photosynthesis".FRONTIERS IN PLANT SCIENCE 7.1769(2016).