干旱区生态环境知识资源中心(Arid): Interactive response of photosynthetic characteristics in Haloxylon ammodendron and Hedysarum scoparium exposed to soil water and air vapor pressure deficits

Arid

	Interactive response of photosynthetic characteristics in Haloxylon ammodendron and Hedysarum scoparium exposed to soil water and air vapor pressure deficits
	Gong Chunmei; Wang Jiajia; Hu Congxia; Wang Junhui; Ning Pengbo; Bai Juan
来源期刊	Journal of Environmental Sciences
ISSN	1001-0742
出版年	2015
卷号	34 页码:184-196
英文摘要	C_4 plants possess better drought tolerance than C_3 plants. However, Hedysarum scoparium, a C_3 species, is dominant and widely distributed in the desert areas of northwestern China due to its strong drought tolerance. This study compared it with Haloxylon ammodendron, a C_4 species, regarding the interactive effects of drought stress and different leaf-air vapor pressure deficits. Variables of interest included gas exchange, the activity levels of key C_4 photosynthetic enzymes, and cellular anatomy. In both species, gas exchange parameters were more sensitive to high vapor pressure deficit than to strong water stress, and the net CO_2 assimilation rate (A_n) was enhanced as vapor pressure deficits increased. A close relationship between A_n and stomatal conductance (g_s) suggested that the species shared a similar response mechanism. In H. ammodendron, the activity levels of key C_4 enzymes were higher, including those of phosphoenolpyruvate carboxylase (PEPC) and nicotinamide adenine dinucleotide phosphate-malate enzyme (NADP-ME), whereas in H. scoparium, the activity level of nicotinamide adenine dinucleotide-malate enzyme (NAD-ME) was higher. Meanwhile, H. scoparium utilized adaptive structural features, including a larger relative vessel area and a shorter distance from vein to stomata, which facilitated the movement of water. These findings implied that some C_4 biochemical pathways were present in H. scoparium to respond to environmental challenges.
英文关键词	C_4 photosynthesis Gas exchange H. ammodendron H. scoparium Water stress Vapor pressure deficit
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5494522
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335531
作者单位	Gong Chunmei, College of Life Sciences, Northwest A&F University, Yangling, Shanxi 712100, China.; Wang Jiajia, College of Life Sciences, Northwest A&F University, Yangling, Shanxi 712100, China.; Hu Congxia, College of Life Sciences, Northwest A&F University, Yangling, Shanxi 712100, China.; Wang Junhui, College of Life Sciences, Northwest A&F University, Yangling, Shanxi 712100, China.; Bai Juan, College of Life Sciences, Northwest A&F University, Yangling, Shanxi 712100, China.; Ning Pengbo, College of Veterinary Medicine, Northwest A&F University, Yangling, Shanxi 712100, China.
推荐引用方式 GB/T 7714	Gong Chunmei,Wang Jiajia,Hu Congxia,et al. Interactive response of photosynthetic characteristics in Haloxylon ammodendron and Hedysarum scoparium exposed to soil water and air vapor pressure deficits[J],2015,34:184-196.
APA	Gong Chunmei,Wang Jiajia,Hu Congxia,Wang Junhui,Ning Pengbo,&Bai Juan.(2015).Interactive response of photosynthetic characteristics in Haloxylon ammodendron and Hedysarum scoparium exposed to soil water and air vapor pressure deficits.Journal of Environmental Sciences,34,184-196.
MLA	Gong Chunmei,et al."Interactive response of photosynthetic characteristics in Haloxylon ammodendron and Hedysarum scoparium exposed to soil water and air vapor pressure deficits".Journal of Environmental Sciences 34(2015):184-196.