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J Integr Plant Biol, 1980, 22 (1): -, Research Article
The Effects of Cytokinins on Unfolding of Cotyledons and Opening of Hypocotylar Hooks of Cucumber
Tao Guo-qing, Song Yan-ru, Chen Hui-ying, Tong Zhe, Lian Han-ping, Li Shu-huan and Tsui Cheng
doi:
Abstract
Benzyladenine (BA), zeatin and kinetin caused the unfolding of cucumber (Cucumis sativus L. Var. Jing-ye No. 4) cotyledons. But the other plant hormones e.g. gibberellic acid (GA3), indoleacetic acid(IAA), ethylene (ethrel), abscisic acid (ABA) and other related compound e.g. KCl, adenine were not so. This response was caused by even lower concentration (0.01 ppm). Therefore, it could be used as a bioassay for cytokinins. KCl affaeted synergistically on cytokinin-induced unfolding. Basally applied BA (10 ppm) stimulated the opening of the intact hypocotylar hook. The light affacted synergistically on BA-induced opening. However, basally applied BA prevented the opening of decapitated hooks, especially in the light. The cotyledons were found to play a part of effects in maintaining the hook.
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