Auxin-gibberellin relationships in their effects on hypocotyl elongation of light-grown cucumber seedlings. Responses of sections to auxin, gibberellin and sucrose

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The sensitivity of light-grown cucumber hypocotyl sections to IAA and GA_3 depends on the degree of aging of the tissue. A greater response to GA_3 was obtained with young tissue, while that to IAA was obtained with relatively old tissue. The response to IAA reached a maximum at about 15 hr of incubation ; the younger the tissue the earlier the time of maximum response. The response to GA_3 continued for more than 70 hr with a constant growth rate. Very young tissue started to respond to GA_3 without lag time; the older the tissue the later the start of the response. Sucrose (2%) inhibited IAA-induced elongation, while there was a distinct synergism between GA_3 and sucrose. The promotive effect of sucrose on GA_3-induced elongation was also obtained when sections were pretreated with sucrose, then transferred to GA_3. Mannitol (1%) strongly inhibited IAA-induced elongation, but not GA_3-induced elongation.
日本植物生理学会の論文