籼稻多柱头颖花有两种类型:(1)、多柱头多子房;(2)、多柱头单子房。试验证明:多柱头多子房性状属单隐性基因控制。多柱头不育株,由于柱头多而长,接受花粉面积大,异交结实率高。1984年—1985年测定,多柱头不育株,异交结实率为71.5—76.1％。多柱头多子房不育株与恢复系配制的F_1杂种,完全能恢复成双柱头单子房,不存在复米,不影响大米的经济价值。 There are two types of Indica multi-stigma: (1), multi-stigma multi-ovary; (2), multiple stigma single ovary. Experiments show that: multi-stigma multi-ovary traits are a single recessive gene control. Multi-stigma sterile plant, due to the stigma and long, pollen area to accept large, outcrossing seed setting rate. 1984 - 1985 determination, multi-stigma sterile plants, outcrossing rate of 71.5-76.1%. F_1 hybrids with multi-stigma multi-ovary sterile plants and restorer lines could be completely recovered into double stigma single ovary without the presence of double rice, which would not affect the economic value of rice.