自 70年代杂交水稻完成三系配套以来 ,在生产上应用发展迅速 ,对粮食增产发挥了极其重要的作用。由于杂交稻种子的耐藏性比常规稻差 ,如贮藏不当 ,容易导致种子生活力和活力下降 ,而其制繁种技术要求严格 ,制种产量低 ,因此种子成本较常规稻要高 ,杂交稻制种产量易受制种期间天 Since the completion of the three-line hybrid rice cultivation in the 1970s, the rapid development of its application in production has played an extremely important role in increasing grain output. Due to poor seed storage resistance of conventional hybrid rice, improper storage can easily lead to the decrease of seed viability and vitality. However, its seed production technology is more stringent and seed production is lower, so the cost of seed is higher than that of conventional rice and hybridization Yield of rice seed production is susceptible to seeding days