J Integr Plant Biol. ›› 1990, Vol. 32 ›› Issue (7): -.

• Research Articles •    

Effects of Al3+ on Ca2+-ATPase Activity on Chloroplasts of Rice and Relation to Calmodulin

Liu Hou-tian and Hao Lu-ning   

Abstract: The relationship between aluminium phytotoxicity and calmodulin has been studied with. calcium-dependent ATPase in chloroplasts of rice. This enzyme could be activated by extrinsic calmodulin. It showed that the activity of Ca2+-ATPase in chloroplasts was regulated by calmodulin. The activation of calmodulin to the enzyme might be inhibited by calmodulin antagonists, TFP and CPZ. The effects of A13+ on the activation of calmodulin was similar to that of the calmodulin antagonists. Calcium could reduce the inhibition of aluminiutn. It seems that there is a model of toxic responses in plants to aluminium: Al3+→calmodulin→target enzy mes→metabolism.

Key words: Rice, Chloroplast, Ca2+-ATPase activity, AL3+, Ca2+, Calmodulin

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