J Integr Plant Biol. ›› 1996, Vol. 38 ›› Issue (6): -.

• Research Articles •    

Exogenous Ca2+ Inhibits Senescence-Retarding Effect of Cytokinins in Detached Rice Leaves

Peng Xin-xiang and Yamauchi M   

Abstract: Cytokinins and Ca2+ singly retarded senescence of detached rice leaves. When Ca2+ was applied together with cytokinins, the effectiveness of cytokinins was significantly reduced. Ca2+ and cytokinins did not stimulate ethylene production synergistically, ruling out the possibility that ethylene was involved in the inhibition of cytokinin-induced senescence- retarding effect by Ca2+. The experiment with specific compounds known to increase (Ca ionophore A23187), or decrease (EGTA, LaCl3, Verapamil, chlorpromazine) cytosolic Ca2+ level indicated that the elevated cytosolic Ca2+ retards senescence.

Key words: Cytokinin, Ca2+, Senescence, Rice

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