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24-epibrassinolide promoting the cell division of Dunaliella salina relation to Ca~(2+) and calmodulin

Yuan Lin, Zhao Yuju

Shanghai Institute of Plant Physiology,Chinese Academy of Science.Shanghai 200032

Abstract

24-epibrassinolide was found to promote the cell division of Dunaliella salina, at a concentration as low as 0.005mg/L, with an optimal concentration at about 0.5mg/L. In contrast to kinetin, which is effective only in light, 24-epiBL could promote cell division both in light and in the dark. With Ca~(2+), EGTA, A_(23187), and Verapamil we found that the promoting of cell division by 24-epiBL was related to Ca~(2+) and Ca~(2+) channel. The depression effect of W_(7) indicates that the cell division of Dunaliella salina relates to calmodulin (CaM). These results may indicate that 24-epiBL could promote cell division of Dunaliella salina and has a different way from kinetin. Moreover, 24-epiBL has its effect on the cell division through increasing cytoplasm Ca~(2+) concentration. The results also imply that 24-epiBL regulated cell division through its effect on protein synthesis.

Key words: 24-epibrassinolide;Dunaliella salina;Ca~(2+)

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Citing This Article：

Yuan Lin, Zhao Yuju. 24-epibrassinolide promoting the cell division of Dunaliella salina relation to Ca~(2+) and calmodulin. Acta Physiol Sin 1999; 51 (2): (in Chinese with English abstract).