The effects of cyto kinins on unfolding of cotyledons and opening of hypocotylar hooks of cucumber cucumis sativus cultivar jing ye no. 4

Tao, G.Q.; Song, Y.R.; Chen, H.Y.; Tong, Z.; Lian, H.P.; Li, S.H.; Tsui, C.

Acta Botanica Sinica 22(1): 37-40


ISSN/ISBN: 0577-7496
Accession: 006662322

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Benzyladenine (BA), zeatin and kinetin caused the unfolding of cucumber (C. sativus L. var. Jing-ye No. 4) cotyledons. Other plant hormones including gibberellic acid (GA3), IAA, ethylene (ethrel), abscisic acid (ABA) and other related compounds had no such effect. This response could be used as a bioassay for cytokinins. KCl acted synergistically with cytokinin-induced unfolding. Basally applied BA (10 ppm) stimulated the opening of the intact hypocotyl hook. The light synergistically affected BA-induced opening. Basally applied BA prevented the opening of decapitated hooks, especially in the light. The cotyledons played a part in maintaining the hook.