Dormancy in Dioscorea: Rapid Germination of Detached Embryos from Dormant Seeds of D. tokoro

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概要

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• The intact dormant seeds of Dioscorea tokoro germinate slowly if at all between 11-23℃; for full and rapid germination they require prior chilling treatment [Okagami and Kawai (1982) Bot. Mag. Tokyo 95: 155]. The germination abilities of zygotic embryos detached from dormant seeds of this species were studied under various nutritional and temperature regimes. For germination of embryos, the minimum nutritional components in Murashige and Skoog's (1962) medium that were required were sucrose and NO_3^- or SO_4^2- As the source of carbohydrate for germination of detached embryos, sucrose, mannose and maltose were effective; glucose and fructose were less effective; and rhamnose was entirely unable to support germination. Embryos detached from dormant seeds, incubated with the sucrose plus KNO_3, germinated more rapidly with increasing temperature up to 35℃. However, application of sucrose and KNO_3 did not induce germination of intact seeds above 26℃. Therefore, it is very possible that the endosperm exerts an inhibitory function on germination at such high temperatures. When seeds were incubated after a cut was made over a small part of the edge of the endosperm in which the radicle of the embryo is encased, germination occurred rapidly but the increase in germination percentage was slight. This result suggests that the endosperm suppots part of the germination inhibition by means of a mechanical barrier or its impermeability to water or gases. Physiological features of the endosperm alone or interactions between the embryo and endosperm may contribute significantly to the characteristics of dormancy of intact seeds of this species.

• 日本植物生理学会の論文

著者

• Okagami Nobuo

  Biological Institute Faculty Of Science Tohoku University

• Terui Keisuke

  Department of Biology, Faculty of Education, Iwate University

• Terui K

  Iwate Univ. Morioka Jpn

• Terui Keisuke

  Department Of Biology Faculty Of Education Iwate 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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