Differences in the Rates of Metabolism of Various Triacylglycerols during Seed Germination and the Subsequent Growth of Seedlings of Dioscorea tokoro, a Perennial Herb

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概要

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• Differences in the rates of metabolism of various tri-acylglycerols (TAGs) in the reserve oil of seeds during the course of germination and seedling growth were studied in Dioscorea tokoro, an East Asian perennial herb. Eleven molecular species of TAG were determined in the reserve oil of seeds. These TAGs contained five fatty acids: palmitic acid (P); stearic acid (S); oleic acid (O); linoleic acid (L); and linolenic acid (Ln). At 20℃, levels of TAGs with one or less than one L moiety, such as OLO, OOO, PLO, POO, OLS, and OLnO, decreased rapidly during ger-mination and the initial elongation of seedlings, whereas levels of other TAGs decreased slowly during the subsequent development of seedlings. Even though seeds were unable to germinate at these temperatures, levels of some TAGs decreased during incubation at 5℃ and at 30℃. Such changes might be related to the metabolism required for the survival of seeds at these temperatures. It is also possible that they might be involved in the breaking of dormancy at low temperatures or in the induction of secondary dor-mancy at high temperatures. The present results provide an example of the selective utilization of the TAGs in the reserve oil of seeds during germination and the subsequent growth of seedlings.

• 日本植物生理学会の論文

著者

• Okagami Nobuo

  Biological Institute Graduate School Of Science Tohoku University

• Okagami Nobuo

  Biological Institute Faculty Of Science Tohoku University

• Terui Keisuke

  Department of Biology, Faculty of Education, Iwate University

• 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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