Auxin-gibberellin relationships in their effects on hypocotyl elongation of light-grown cucumber seedlings II. Effect of GA_3-pretreatment on IAA-induced elongation
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概要
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IAA-induced growth of light-grown cucumber hypocotyl sections is markedly enhanced by GA_3-pretreatment of the sections; there is a distinct synergism between IAA and GA_3. Water pretreatment also enhances IAA-induced growth. On the other hand, IAA pretreated sections showed practically no further growth in response to post treatment with CA_3. The enhancing effect of GA_3 is obtained with only 30 min pretreatment, the maximum effect occuring with 2 hr pretreatment. Pretreatment longer than 8 hr is less effective. This enhancing effect of GA_3 can be observed soon after post treatment with IAA. The response of GA_3-pretreated sections to IAA is greater in pretreatment with higher concentrations of GA_3, and higher degrees of synergism between IAA and GA_3 are obtained at IAA. concentrations less than 10^<-4> M. This synergistic interac.tion between GA_3 and IAA is more marked in aged hypocotyl sections than in young sections. From these results we concluded that gibberellin sensitizes hypocotyl cells to the subsequent effect of auxin on cell elongation.
- 日本植物生理学会の論文
著者
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Katsumi Masayuki
Biology Department Division Of Natural Sciences International Christian University
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Kazama Haruko
Biology Department Institute Christian University
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