关键词: 杂交水稻, 不育系, 经济性状, 配合力, 遗传力

Abstract:

In order to analyze the combining ability of major economic characters of three-line sterile line De 66A, 18 cross combinations from 3 sterile lines and 6 restorer lines were used by the 3×6 NCII genetic mating design. The results showed that the general combing ability value （GCA） of effective panicles, 1 000-grain weight, seed setting rate and grain weight per plant of De 66A were significantly higher than Ganxiang 1A and Luxiang 618A. The special combining ability value of effective panicles, 1 000-grain weight and grain weight per plant of De 66A/ Chenghui 727 were the highest in all of 18 hybrid combinations. 18 hybrid combinations heterosis of main economic traits were greatly influenced by the sterile lines than the restorer lines. The narrow sense heritability ranged from great to small as follows: grain weight per plant, effective panicles, seed setting rate, 1000-grain weight, panicle length and full grain per panicle. 

Key words: hybrid rice, sterile line, economic characters, combining ability, heritability