%0 Journal Article
%T Characteristics of water absorption by Atriplex triangularis roots under salt stress<br>三角叶滨藜根吸水特点与其抗盐性的关系
%A BU Qing-mei
%A WANG Yan-hua
%A HAN Li-ya
%A BAI Xin-fu
%A ZHU Jian-jun
%A <br>卜庆梅
%A 王艳华
%A 韩立亚
%A 柏新富
%A 朱建军
%J 生态学杂志
%D 2007
%I 
%X In this study, Atriplex triangularis plants were grown in a nutrient solution containing different concentrations of NaCl, and the pressure potential of root xylem, osmotic potential of its sap, and Na contents in plant, sap and nutrient solution were measured with pressure chamber, freezing-point osmometer, and atomic absorption spectrometer, respectively. The results showed that with the increasing salinity of nutrient solution, the Na content in plant and in xylem sap increased, but the ultrafiltration coefficient of root system and the relative accumulation amount of Na in plant decreased, illustrating that the root cells of A. triangularis had a strong filtration action. The osmotic potential of root xylem sap decreased with decreasing osmotic potential of nutrient solution, but the water potential (osmotic potential plus pressure potential) of the solution in root xylem increased steadily till higher than the osmotic potential of nutrient solution. It was concluded that A. triangularis could use the lower negative pressure in root xylem to absorb water via anti-osmosis to counteract the low osmotic potential of nutrient solution, and avoid the absorption of excess amount of salt via high-efficient ultrafiltration of root cells.
%K Atriplex triangularis
%K salt resistance
%K water potential
%K xylem pressure<br>三角叶滨藜
%K 抗盐性
%K 水势
%K 木质部压力
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=B04840A985D251F36078BD07A90EF003&aid=97BAEAC0CACADF72&yid=A732AF04DDA03BB3&vid=96C778EE049EE47D&iid=F3090AE9B60B7ED1&sid=A7E1C896834B988A&eid=87A9A510C01DA8C7&journal_id=1000-4890&journal_name=生态学杂志&referenced_num=0&reference_num=24