The role of gibberellins in the growth of floral organs of Pharbitis nil

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概要

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• Evidence that the synthesis of GA_3 is involved in the growth of floral organs of Pharbitis nil is presented. GAs in floral organs at different developmental stages were surveyed using TLC followed by the bioassay with two dwarf rice seedlings, 'Tanginbozu' and 'Waito-C'. The amount of GAs in the petal and stamen increased rapidly after the petal emerged from calyx, reached a maximum 12 hr before anthesis, then declined markedly thereafter. The GA content in the calyx remained unchanged before and after anthesis, and that in the pistil increased after anthesis. Pharbitis flowers contained at least two active GAs, one of which was probably GA_3, the other appeared to be GA_<19>. GA_3 was detected in relatively large amounts in both the petal and stamen during their rapid elongation. In the calyx, which showed little increase in fresh weight during rapid flower growth, GA_<19> was the dominant GA. Exogenously supplied GA_3 promoted elongation of sections in excised young filaments. Sucrose was necessary for definite growth promotion by GA_3. GA_<19> had little effect on filament elongation, and IAA was rather inhibitive.

• 日本植物生理学会の論文

著者

• MURAKAMI YUTAKA

  National Institute of Agricultural Sciences

関連論文

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• The role of gibberellins in the growth of floral organs of Pharbitis nil

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