11. 温度耐性イネの種子の水分動態(平成20年度第54回低温生物工学会年会)

概要

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Dry weight, water content, water status in relation to kernel quality of ripening seeds of rice cultivars against thermal stresses were examined. Although a temperature of 20℃ suppressed the growth rate of developing seeds of cvs. Nikomaru and Hinohikari, the dry weight of cv. Nikomaru was entirely recovered on 21DAF. Additionally, the change in dry weight of cv. Nikomaru seeds grown at higher temperature did not differ from that of control during maturation. The water contents and T_1 values of cv. Nikomaru grown at 20℃ between 14 and 21 DAF markedly decreased in seeds indicating that the free water disappeared under low temperature stress during early ripening stage. After harvesting, thermal stresses did not severely suppress the ratio of ripened seeds and its quality of cv. Nikomaru. These results suggested that the diminish of free water in developing seeds is a reason that the quality in seeds can be maintained under low temperature stress.
低温生物工学会の論文
2008-12-30