在杂交水稻繁殖、制种过程中,常因气候和栽培条件的影响,造成花时不遇,使当天有不少开花母本未授上粉。这些关闭了的颖花,各个品种都有部分外露柱头,据初步调查,二九南1号不育系外露柱头有27.2%,广陆银不育系有23.9%,珍汕97不育系有31.5%。闭花后的外露柱头是否还可授粉结实,柱头寿命有多长,也就是它的生活力状况如何?柱头生活力的长短、强弱与繁殖、制种的结实率高低密切相关。1977年晚造,我们对二九南1号、 In hybrid rice breeding, seed production process, often due to climate and cultivation conditions, resulting in not met, so that a lot of flowering mother that day did not grant flour. According to the preliminary investigation, 27.2% of the exposed stigma of male sterile line No.29nan and 23.9% of male sterile line of Guanglu silver, and the sterile line of Zhenshan 97 31.5%. After the flowering stigma whether pollination can be strong, how long stigma life expectancy, that is, its vitality? Stigma viability of the length, strength and breeding, seed production is closely related to the level of seed set. Made late in 1977, we on the 29th South 1,