当前杂交水稻制种已步入高产阶段,其关键技术措施之一是如何进一步提高不育系异交结实率。实践表明:提高异交结实率较为切实可行的途径是以提高柱头外露率为中心,在较高外露率基础上提高外实率,稳定和提高非外实率。据考证,母本柱头外露授粉结实一般都占总结实的75%以上,是制种产量的主体构成。然而,不育系柱头外露率的高低不仅与本身的遗传因素密切相关,很大程度上还受到环 The current hybrid rice seed production has entered a high-yield stage, one of the key technical measures is how to further improve the male sterile line outcrossing rate. Practice shows that it is more practical and feasible to improve the rate of outcrossing by raising the stigma exsertion rate, improving the external real rate, stabilizing and improving the non-external real rate based on the higher external exposure rate. According to research, the parent stigma pollination generally account for more than 75% of total solid, is the main component of seed production. However, the stigma exsertion rate of male sterile lines is not only closely related to their own genetic factors, but also to a large extent by the ring