%0 Journal Article
%T Nitrate as an Enhancer of Root Signal in the Regulation of Stomatal Movement in Plants under Drought Stress<br>干旱胁迫下氮素营养与根信号在气孔运动调控中的协同作用
%A Jing Liu&#
%A Kaifa Wei&#
%A Zhihui Gao
%A Bingbing Li
%A Huibo Ren
%A Jianfang Hu
%A Wensuo Jia
%A <br>刘静&#
%A 魏开发&#
%A 高志晖
%A 李冰冰
%A 任慧波
%A 胡建芳
%A 贾文锁
%J 植物学报
%D 2008
%I 
%X Plants can sense changes in soil water status before obvious water deficit occurs in shoots. Abscisic acid(ABA) and pH are key signals mediating root-to-shoot signaling. Here we report that drought leads to changes in xylem pH differently in Commelina communis L., tomato(Lycopersicon esculentum Mill.) and sunflower(Helianthus annuus L.). The drought-induced changes in pH were not related to changes in xylem nitrate content. However, for the plant species tested, nitrate was able to increase the stomatal sensitivity to ABA in detached leaves. Moreover, root-splitting experiments demonstrated that supplying extra nitrate in soil increased the stomatal sensitivity to root-sourced soil-drying signals when the nitrate concentration in the xylem was lifted. Our results suggest that nitrate can enhance the root signal and thereby jointly regulate stomatal movement under drought stress.
%K <br>干旱
%K 氮素营养
%K 根信号
%K 气孔运动
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=97AE3D0EBF25E42C466FEF50E492F710&aid=57178E6EDF6828D8EF469D69C35E541F&yid=67289AFF6305E306&vid=C5154311167311FE&iid=CA4FD0336C81A37A&sid=339D79302DF62549&eid=1371F55DA51B6E64&journal_id=1674-3466&journal_name=植物学报&referenced_num=0&reference_num=23