5个水稻三系新不育系异交特性研究

A Study on the Outcrossing Characteristics of 5 New Cytoplasm Male Sterile Lines of Rice

对5个新育成的水稻不育系和金23A(CK)的开花习性、柱头外露率、柱头活力、田间异交结实率等异交特性进行了系统观察研究。结果表明:井冈5A异交性能总体最好,柱头外露率高,花时集中,开花率高,田间异交结实率高达48.1%;其次是井冈2A、井冈3A,开花率高,柱头活力强,田间异交结实率分别为38.5%、39.2%;井冈1A、井冈4A异交特性表现较一般。

Outcrossing characteristics of 5 cytoplasm male sterile （CMS） lines of rice Jingsang 1 A, Jing.gang 2A, Jinggang 3 A ,Jinggang 4A, Jinggang 5A and Jin23A（ CK）, such as flowering habits, stigma exser-tion rate, stigma vitality and outcrossing fertility were observed. In Jinggang 5A, the ratio of stigma exsertionwas the highest; all of the flowers opened in a short time ; the ratio of opening flowers was the highest and the outcrossing fertility was the best, up to 48.1% in field. The outcrosing fertility of Jinggang 2A and 3A was upto 38.5% and 39.2% , respectively, the ratio of opening flowers＇was the highest, the ratio of stigma exsertion was the highest; the outcrossing characteristics of Jinggang1 A and Jinggang4A were the average .