Abstract
Cuttings of “Kyoho” grape were collected during endodormancy (November) and during ecodormancy (January) . Water stress was induced by storing the cuttings in desiccators packed with silica gel. ABA (50 mg/L) and BA (40 mg/L) treatments were given to the cuttings after water stress by completely soaking them in the solutions for 1 h after a presoak in water for 12 h. Water stress enhanced early budbreak and increased the number of buds that broke. Response of budbreak to water stress showed specificity to the water content level attained in the cuttings at the end of stress. Promotive effects of BA and inhibitory effects of ABA on budbreak were significant during endodormancy but not during ecodormancy. Water stress given during endodormancy showed a highly positive interaction with exogenous cytokinins (BA) .
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