ワイルドライス(Zizania属)種子の休眠打破に対する低温要求性(平成17年度第51回低温低物工学会研究報告)

概要

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Seeds of almost all plants growing in areas with marked seasonal temperature variations require a period of cold treatment prior to germination. Wild rice, Zizania palustris L. and Z. aquatica L., are annual aquatic plants having deep dormant seeds. Since water in seeds plays an important role not only in physiological but also in chemical processes, dynamic states of water in wild rice seeds were determined during stratification. Wild rice seeds required at least 12 weeks of low temperature (3℃) treatment to break dormancy. The significant prolongation in T_1 was observed in the seeds chilled for 16 weeks whereas water content did not change. Zizania seeds indicating typical recalcitrant seed, have not tightly bound water observed in orthodox seeds such as wheat and rice plants. The prolongation of T_1 in germinating seeds mainly depended upon increase in T_1 of long fraction derived from free water. The prolongation of T_1 of the long fraction in the chilled seeds of wild rice suggested that the dormancy break entirely occurred at 16 weeks. These tendencies were more manifested in T_1 compared to T_2. Changes in molecular dynamics of water indicated that dormancy could be easily monitored by T_1. Therefore, the water compartments in endosperms of germinating seeds would reflect potentiality breaking of dormancy in seeds of wild rice as an aquatic plant.
低温生物工学会の論文
2005-12-30