Senescence of Rice Leaves XXIV. Involvement of Calcium and Calmodulin in the Regulation of Senescence

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Effects of compounds that influenced calcium uptake and calmodulin inhibitors on the senescence of detached rice leaves were examined. Chelators, ethyleneglycol-bis-(β-aminoethyl ether)-N,N,N',N'-tetraacetic acid (EGTA) and 1,2-bis-(o-aminophenoxy)-ethane-N,N,N',N'-tetraacetic acid (BAPTA), significantly promoted senescence of detached rice leaves in the dark and light. The effect of EGTA can be reversed by treating detached rice leaves with calcium. Verapamil, a calcium channel blocker, and lanthanum chloride, a calcium antagonist, promoted dark-induced, and suppressed BA- and light-retarded senescence of detached rice leaves. Calcium ionophore A23187 and ruthenium red, believed to raise cytosolic level of Ca^<2+>, were quite effective in retarding dark-induced and ABA-promoted senescence of detached rice leaves. Calmodulin inhibitors, W-7, compound 48/80, chlorpromazine and trifluoperazine, significantly promoted dark-induced, and suppressed BA- and light-retarded senescence of detached rice leaves. It is concluded that cytosolic level of Ca^<2+> may regulate senescence of detached rice leaves through a calmodulin-dependent mechanism.
日本植物生理学会の論文