A Comparative Study of the Effect of Abscisic Acid and cAMP on Protein Synthesis in Wheat Caryopses under Drought Conditions

N. N. Maksyutova^* and L. V. Viktorova

Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, ul. Lobachevskogo 2/31, Kazan 420111, Russia; fax: (8432) 38-7577; E-mail: maksyutova@yandex.ru

^* To whom correspondence should be addressed.

Received February 13, 2002; Revision received December 11, 2002

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The effect of exogenous abscisic acid and cAMP on synthesis of soluble proteins in wheat caryopses in drought has been studied. Both compounds affected the formation of the polypeptides whose synthesis was stimulated by dehydration: they increased the incorporation of the label into polypeptides of 13, 15, and 26 kD and decreased the incorporation of the label into polypeptides of 14, 64, and 77 kD. Abscisic acid and cAMP increased the level of the incorporation of [¹⁴C]leucine into the low-molecular-weight polypeptides of 12, 17, and 19 kD whose synthesis was suppressed by drought. These data suggest that the cyclic adenylate signal system is probably involved in the effect of abscisic acid on protein synthesis in drought.

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KEY WORDS: protein synthesis, drought, abscisic acid, cAMP, signal systems of plant cells

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