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Differential hormone responses in different growing zones of the bean hypocotyl

✍ Scribed by Nobuharu Gotô; Yoji Esashi

Publisher
Springer-Verlag
Year
1974
Tongue
English
Weight
841 KB
Volume
116
Category
Article
ISSN
0032-0935

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✦ Synopsis

Differential growth responses to plant growth substances--a cytokinin (benzyl adenine), gibberellic acid (GA3), indoleacetic acid (IAA), abscisic acid (ABA), coumarin and ethylene--and to environmental factors (carbon dioxide and red light) were found in tissues of different age in a 4-cm segment of the etiolated hypocotyl of Phaseolus vulgaris L. Elongation in all zones of the hypocotyl which were growing or were about to grow was generally enhanced, but each factor or phy~ohormone acted specifically on a particular zone, in the order cytokinin, red light, GA3, C02, C2H4 and IAA, going from the top of the hypocotyl. ABA inhibited elongation both in the red-light-and GAa-dcpendent, immature zones and in the IAA-dependent, relatively mature zones. The effects of C2H 4 and C02 were opposite and those of auxin and eoumarin were similar.

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