Leaf and whole tree adaptations to mild salinity in field grown Populus euphratica

CORC > 新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所(2010年以前数据)

	Leaf and whole tree adaptations to mild salinity in field grown Populus euphratica
	Zeng ; Fanjiang ; Yan ; Hailong ; Arndt ; Stefan K.
刊名	TREE PHYSIOLOGY
	2009
卷号	29 期号:10 页码:1237-1246
关键词	SALT TOLERANCE OSMOTIC ADJUSTMENT HYPERARID DESERT TRANSITION ZONE WATER RELATIONS NW CHINA TRANSPORT STRESS PLANTS ROOTS
ISSN号	0829-318X
通讯作者	Arndt, SK, Univ Melbourne, Dept Forest & Ecosystem Sci, 500 Yarra Blvd, Richmond, Vic 3121, Australia
中文摘要	Populus euphratica Oliv. is a highly salt tolerant tree species, and this study represents the first comprehensive investigation of salt tolerance mechanisms of mature trees of P. euphratica in the field. We measured NaCl concentration in xylem sap, NaCl accumulation in leaves, the effect of NaCl on leaf physiological parameters and osmotic adjustment and the allocation and distribution of NaCl between different plant organs on a whole plant level in trees exposed to mild saline groundwater (around 30 mM) in China. Populus euphratica showed three key mechanisms of salt tolerance. The primary mechanism had a strong control over Na+ and Cl- uptake with effective exclusion mechanisms for Cl- with up to 99% of the external NaCl being excluded from the xylem. Secondly, the trees allocated large proportions of NaCl into the leaves, which served as a salt elimination mechanism as the leaves are ultimately shed at the end of the growing season. Thirdly, the trees tolerated high foliar Na+ concentrations through a combination of osmotic adjustment using sucrose and probable sequestering of Na+ in the apoplast. Our results indicate that the control of Na+ and Cl- uptake and the regulation of Na+ and Cl- delivery to the shoot are key to salt tolerance of P. euphratica in the field with tolerance of high Na+ concentrations in leaves being a critical component.
学科主题	植物生理学
收录类别	SCI
公开日期	2011-08-19
内容类型	期刊论文
源URL	[http://ir.xjlas.org/handle/365004/10078]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	Zeng,Fanjiang,Yan,et al. Leaf and whole tree adaptations to mild salinity in field grown Populus euphratica[J]. TREE PHYSIOLOGY,2009,29(10):1237-1246.
APA	Zeng,Fanjiang,Yan,Hailong,Arndt,&Stefan K..(2009).Leaf and whole tree adaptations to mild salinity in field grown Populus euphratica.TREE PHYSIOLOGY,29(10),1237-1246.
MLA	Zeng,et al."Leaf and whole tree adaptations to mild salinity in field grown Populus euphratica".TREE PHYSIOLOGY 29.10(2009):1237-1246.