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以粳稻品种 USSR5、Hatanishiki 和籼稻品种密阳 23、N22 为材料,研究了水稻品种间种子低温发芽力的差异,并进一步从内源植物激素含量、种子对激素的敏感性及淀粉酶等方面对耐低温发芽的机理进行探讨。结果表明,来自前苏联的 USSR5 和来自日本的 Hatanishiki 低温发芽力高,而籼稻品种 N22、密阳 23 低温发芽力弱,这可能与种子对赤霉素(gibberellin, GA)、脱落酸(abscisic acid, ABA)敏感性更强有关,且低温增加了这种敏感性;低温和外源激素处理可能主要通过影响淀粉酶酶带 3 的活性而起作用;在整个低温萌发过程中,USSR5 种子中内源激素 ABA 含量在相当长的时间内保持较高水平,其 GA1/ABA 值始终低于 N22,这也可能是其低温发芽率高的原因之一。
The rice varieties USSR5, Hatanishiki and Indica rice varieties Miryang 23 and N22 were used as materials to study the difference of seed germination ability between rice cultivars at low temperature. The effects of endogenous plant hormones, hormone sensitivity and amylase Low temperature sprouting mechanism to explore. The results showed that USSR5 from the former Soviet Union and Hatanishiki from Japan had high germination ability at low temperature, while the low germination ability of indica rice varieties N22 and Mieyang23 at low temperature might be related to the low germination rate of gibberellin (GA), abscisic acid , ABA), and hypothermia increased this sensitivity. Low temperature and exogenous hormone treatment may play a major role by affecting the activity of amylase band 3; During the whole low temperature germination, The level of ABA in the source hormone remains high for a long time and its GA1 / ABA value is always lower than N22, which may also be one of the reasons for its high germination rate at low temperature.