高温老化处理对陆两优996制种不同收获时期种子活力的影响

对杂交水稻陆两优996种子进行40℃、相对湿度100%高温老化处理,测定种子批活力及生理变化.结果表明:在陆两优996制种母本群体终花期后第8～12天收获的种子,经高温老化处理后,其发芽率、发芽势和发芽指数有不同程度提高;第13～17天收获的种子经高温老化处理后,其发芽率、发芽势、发芽指数均变化不大;第18天及以后收获的种子老化处理后,其发芽率、发芽势、发芽指数明显降低,失去了种用价值;高温老化处理后种子中淀粉含量有不同程度的降低,以第14天以后收获的种子淀粉含量降低较多;CAT活性以第13～17天收获的种子降低最快;第11～17天收获的种子经处理后MDA含量差异不大,第8～10天以及第18天以后收获的种子MDA含量显著高于第11～17天收获的种子.

Effects of artificial aging on seed vigor of Luliangyou996 during different harvest periods

Seed vigor and physiology of Luliangyou996 were determined through aging treatment with 40 ℃ and 100% relative humidity artificially. It showed that: the germination rate,germination energy and germination index of seed when it was harvested in 8-12 d after the ending of flower of female parents, increased and then changed a little in 13-17 d, decreased significantly and lost the value after 18 d after aging treatment. The starch content reduced after aging treatment, especially the seed harvest after 14 d; CAT activity of the harvested seed in 13-17 d reduced most quickly; MDA content of the harvested seed in 11-17 d had little difference,but that of the harvested seed was much higher in 8～10 d or after 18 d.