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The transport of ABA from root to shoot and its distribution in response to water stress in Vicia faba L.

Jia Wensuo, Wang Xuechen, Zhang Shuqiu, Lou Chenghou

College of Biological Sciences, Beijing Agricultural University. Beijing 100094

Abstract

~(3)H-ABA loaded in roots of Vicia faba L. could be transported to shoot at a speed of 5.6 cm/min or higher in a relatively short period of 5 min. ABAtransported from roots was distributed mainly in the epidermis. However, after 3 h, it was mainly distributed in mesophyll cells. When the transport was inhibited by covering the leaf surfacc with Parafilm, the transport and accumulation of ABAin leaves declined substantially. The results of autoradiography showed that ABA transported from roots to shoots could be distributied in the apoplast of guard cells and epidermal cells. The rapid transport of ABAfrom root to shoot and its accumulation in apoplast of guard cells indicated that stomatal movement could be controled by ABA communication from root to shoot in response to water stress in Vicia faba L.

Key words: Water stress;ABA;Transport;Guard cell

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Citing This Article：

Jia Wensuo, Wang Xuechen, Zhang Shuqiu, Lou Chenghou. The transport of ABA from root to shoot and its distribution in response to water stress in Vicia faba L.. Acta Physiol Sin 1996; 48 (4): (in Chinese with English abstract).