论文部分内容阅读
生产实践证明,杂交水稻制种母本柱头外露率的高低,直接左右制种产量的高低。目前生产上大面积应有的V20A和珍汕97A等不育系在自然状态下,柱头外露率只有30%左右,在采取一般措施情况下为40～50%,利用敏感期进行特殊的技术处理后,柱头外露率可达到60%以上,高者甚至达80%以上。母本整个生育期对柱头外露率均有一定影响,但从幼穗分化5～8期和抽穗后3天左右的影响最大,称此期为柱头外露敏感期。此时若管理不当,将使母本柱头外露率大幅度下降。因此,要特别强化此时的田间管理,促进柱头外露率和增加柱头长度。
Production practice has proved that hybrid rice seed head stigma exserted the level of production directly around the level of seed production. At present, the sterility lines such as V20A and Zhenshan 97A which are supposed to be on a large area in production should have a stigma exsertion rate of only about 30% under natural conditions and 40-50% under general measures, and carry out special technical treatments during the sensitive period After the stigma exposed rate can reach more than 60%, the high even more than 80%. The female parent had a certain influence on the stigma exsertion rate during the whole growth period, but had the greatest impact on the stigma exsertion period from 5-8 stages and 3 days after heading. At this point if properly managed, will make the female stigma excretion rate dropped significantly. Therefore, we should especially strengthen field management at this time to promote stigma exsertion rate and increase stigma length.