Changes of plasma membrane ATPase activity,membrane potential and transmembrane proton gradient in Kandelia candel and A

Abstract： The salt-secreting mangrove, Avicennia marina, and non-salt-secreting mangrove, Kandelia candel were cultivated in sand with various salinities(0 ‰, 10 ‰, 20 ‰, 30 ‰, 40 ‰) for 60 d. Plasma membrane vesicles of high-purity in leaves and roots of A.marina and K. candel seedlings were obtained by two-phase partitioning. The function of the plasma membranes, the activity of ATPase, membrane potential and transmembrane proton gradient, at various salinities were investigated. The results showed that within a certain range of salinity(A. marina and roots of K. candel: 0-30‰;leaves of K.candel: 0-20‰), the activity of ATPase increased with increasing salinity, while high salinity(above 30‰ or 20‰) inhibited ATPase activity. In comparison with A. marina, K. candel appeared to be more sensitive to salinity. The dynamics of membrane potential and transmembrane proton gradient in leaves and roots of A. marina and K. candel seedlings were similar to that of ATPase. When treated directly by NaCl all the indexes were inhibited markedly: there was a little increase within 0-10‰(K. candel) or 0-20‰(A. marina) followed by sharp declining. It indicated that the structure and function of plasma membrane was damaged severely. 作 者： ZHAO Zhong-qiu    ZHENG Hai-lei    ZHU Yong-Guan   作者單位： ZHAO Zhong-qiu,ZHU Yong-Guan(Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

ZHENG Hai-lei(School of Life Sciences,Xiamen University,Xiamen 361005,China) 

期 刊： 環(huán)境科學(xué)學(xué)報(bào)（英文版）  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(5)  分類號(hào)： X173  Keywords： salinity    A. marina    K. candel    plasma membrane    H-ATPase    Ca-ATPase    membrane potential    transmembrane proton gradient   

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