实践证明,杂交稻种较常规稻种有四个不同的生理特点:一是杂交稻制种开花授粉过程中,因强势花与弱势花的不同,致使种子颖壳闭合度有差异,强势花产生的种子生长势强,颖壳闭合度好,浸种过程中吸水慢,病菌不易浸入;而弱势花则相反。二是杂交稻制种时授粉时间较长。种子成熟不一致,成熟度高的种子发芽势 Practice has proved that hybrid rice has more than four different physiological characteristics of conventional rice varieties: First, hybrid rice seed pollination in the process of flowering, because of the difference between the strong flower and the weak flower, resulting in closure of the seed glume are different, strong flowers produce Of the seeds grow strong, glume closure is good, soaking water absorption slow, bacteria are not easy to infiltrate; the disadvantaged flowers on the contrary. Second, hybrid rice seed pollination longer time. Inconsistent seeds mature, high maturity seed germination potential