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抗冷力强的麻线谷比抗冷力弱的桂朝对低温胁迫具有较高的适应能力,表现在低温吸胀对种子电解质泄漏、根系生长、活力指数、平均发芽天数的影响均是麻线谷小于桂朝。幼苗经低温处理后,根系电导、幼苗转绿、叶片叶绿素荧光对低温的敏感性亦是麻线谷小于桂朝。这些生理特性变化与幼苗存活率相一致,由此认为上述各种变化可作为鉴定水稻品种抗冷力的指标。对3个杂优水稻组合(F_1)及其亲本(三系)进行抗冷力分析结果表明:根系电导、叶片叶绿素荧光、幼苗存活率在一定程度上能反映组合(F_1)及其亲本(三系)之间的抗冷水平,並且杂优水稻的抗冷力倾向于母本。本文对鉴定水稻幼苗的抗冷力方法进行了讨论。
The cold-resistant twine valley had a higher adaptability to low temperature stress than that of the cold-tolerant weaker Guiyu. The results showed that the effects of low temperature swelling on the leakage of electrolyte, root growth, vigor index and average germination days were all at twine valley Less than Gui. After the seedlings were treated at low temperature, the root conductance and seedling turn green, and the sensitivity of leaf chlorophyll fluorescence to low temperature is also less than that of twig line. These changes in physiological characteristics and seedling survival consistent with the above changes that can be used as an indicator of cold tolerance of rice varieties. Cold tolerance analysis of three hybrid rice combinations (F_1) and their parents (three lines) showed that root conductivity, leaf chlorophyll fluorescence and seedling survival rate could reflect F_1 and its parents Line), and the cold tolerance of hybrid rice tended to the female parent. This article discusses the identification of resistance to cold stress in rice seedlings.