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Plant and Cell Physiology, 1995, Vol. 36, No. 8 1525-1529
© 1995

Involvement of Calcium and Calmodulin in Protein and Amino Acid Metabolism in Rice Roots under Anoxia

Nicoletta Aurisano, Alcide Bertani and Remo Reggiani

Istituto Biosintesi Vegetali, C.N.R. via Bassini 15, I-20133 Milano, Italy

The pretreatment of rice roots for 1 h in aerobic conditions with the Ca2+-channel blockers ruthenium red (RR) and verapamil and the calmodulin (CaM) antagonists N-(6-aminohexyl)-5-chloro-1-naphtylenesulfonamide (W-7) and trifluoperazine, induced during 3 h of anoxia: (i) inhibition of amino acid and {gamma}-aminobutyric acid (Gaba) accumulation; (ii) a decline in the protein content; (iii) a release of amino acids and K+ into the growth media. The calcium ionophore A23187 [GenBank] reversed these effects in RR-treated roots. Moreover, the aerobic pretreatment of rice roots with A23187 [GenBank] alone or CaCl2 increased the accumulation of amino acids and Gaba. These data indicate that the Ca2+/CaM complex is involved in the transduction of an anaerobic signal by inhibiting proteolysis and solute release, and activating the Ca2+/CaM-dependent glutamate decarboxylase.

(Received December 22, 1994; Accepted September 11, 1995)
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