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Articles

The Effect of Dormancy on the Heat Shock Response in Gladiolus Cormels ^1,2

Department of Ornamental Horticulture, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel, Department of Virology, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

Cormels of Gladiolus X gandavensis Van Houtte respond to heat shock by an induced synthesis of heat shock proteins. Synthesis of some of the non-heat shock proteins is concomitantly reduced. The ability of dormant cormels to synthesize heat shock proteins (hsps) and to repress the synthesis of non-hsps is greater than that of nondormant ones. A hsp of apparent molecular weight 68 kilodaltons is synthesized only in dormant cormels or in cormels that lost their dormancy after long storage at 25°C. The synthesis of hsps at 40°C, but not at 25°C, is promoted by abscisic acid in nondormant cormels. Methionine incorporation into hsps declines after a 4-hour incubation period at 40°C. Induction of hsps is stronger if exposure to extreme temperature is done gradually.

² Supported by the United States-Israel-Binational Agricultural Research and Development (BARD) Fund, grant I-196-80.