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RELATIONSHIP BETWEEN CALCIUM AND ENDOGENOUS ABA IN SUGARCANE SEEDLINGS UNDER DROUGHT STRESS

Zhang Muqing

Abstract

The relationship between Ca2+ and other second signal molecule(ABA) in sugarcane(Saccharum officinarum L.) seedlings under drought stress was examined.It was found that endogenous ABA accumulated in sugarcane seedlings under drought stress,and the drought-induced increase of ABA content was significantly inhibited by the pretreatment of EGTA(a Ca2+ chelator).It demonstrated that the low concentration of Ca2+ in the cytoplasm might hamper the signal transduction of drought stress and finally decrease the synthesis and release of endogenous ABA,and there might be a crosstalk between the signal transduction pathways mediated by Ca2+ and ABA.

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Key concepts: Endogeny, Drought stress, EGTA, Crosstalk, Saccharum officinarum, Abscisic acid, Guard cell, Calcium