Dormancy in Dioscorea : Generality of gibberellin-induced dormancy in asexual dormant organs

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概要

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• Effects of GA_3 and CCC application on the sprouting of bulbils or subterranean dormant organs of 10 species in the genus Dioscorea were observed. Although the efficiency of both chemicals differed by species, in general GA_3 inhibited and CCC promoted the sprouting of the above dormant organs. In some species, however, diluted GA_3 (0.003-0.3 μM) has a promotive and diluted CCC (3-30 μM) has an inhibitive effect on sprouting. Effects of GA_3 application on shoot elongation were tested on sprouted bulbils. GA_3 promoted elongation when applied directly to the shoots and inhibited it when applied to the bulbous parts. These results suggest that GA activates two opposing reactions-sprouting-promoting and sprouting-inhibiting-in these organs. The complicated relation between GA_3 or CCC concentrations and sprouting were explainable by assuming that the two counteractive reactions were activated by GA in different degrees.

• 日本植物生理学会の論文

著者

• Tanno Noriaki

  Biological Institute Faculty Of Science Tohoku University:(present)department Of Biology Faculty Of

• Okagami Nobuo

  Biological Institute Faculty Of Science Tohoku University

関連論文

• Identification of Endogenous Gibberellins and Abscisic Acid from Dormant Bulbils of Dioscorea japonica (Japanese Yam)
• The nature of gibberellin-induced dormancy in aerial tubers of Begonia evansiana
• Dormancy in Dioscorea : Generality of gibberellin-induced dormancy in asexual dormant organs
• Sprouting Promotion by inhibitors of nucleic acid and protein synthesis in the bulbils of some herbaceous plants
• Differences in the Rates of Metabolism of Various Triacylglycerols during Seed Germination and the Subsequent Growth of Seedlings of Dioscorea tokoro, a Perennial Herb
• Dormancy in Dioscorea: Rapid Germination of Detached Embryos from Dormant Seeds of D. tokoro
• Dormancy in Dioscorea : Range, Duration and Timing of High-Temperature Treatment in Germination Inhibition of D. tokoro Seeds
• Dormancy in Dioscorea : Sprouting promotion by inhibitors of protein synthesis in bulbils and rhizomes

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