Dormancy in Dioscorea : Range, Duration and Timing of High-Temperature Treatment in Germination Inhibition of D. tokoro Seeds

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概要

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• The effects of temperature on induction and release of high-temperature inhibition in seed germination of Dioscorea tokoro Makino, a monocotyledonous summer perennial of the temperate zone of East Asia, were investigated. Germination was increasingly inhibited with elevation of temperature over 23℃ and lengthening of its duration. The low temperature limit for germination inhibition decreased with lengthening of the duration of high temperature. The most sensitive phase for high temperature was 1-2 days after the start of imbibition at 20℃. The germination inhibition by high temperature was reversed by chilling at 5℃, which is the optimum temperature for breaking the natural dormancy (primary dormancy) of this seed. This showed that the high-temperature inhibition of germination does not cause mortal damage but only secondary dormancy (induced dormancy). Seeds from a cold climate (Miyagi Pref.) responded rather quickly to both high temperature and chilling compared to seeds from a warm climate (Kagoshima Pref.). The responsiveness to high temperature and chilling of D. tokoro seed may affect the germination time under natural conditions.

• 日本植物生理学会の論文

著者

• Kawai Masashi

  Biological Department Faculty Of Science Hirosaki University

• 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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