The indica-japonica characteristics of a novel Rice germplasm Yihui 1577 was identified based on six agronomic traits of lemma hair, pheno reaction, internode length between the first and second nachiees, the hull color at heading, leaf hair and grain shape with the morphological index method founded by Mr Chen. The result showed that Yihui 1577 belong to japonicalinous restorer line. The yield combination ability analysis of Yihui 1577 made by not complete dual crossing with 4 CMS lines and 6 restore lines indicated that general combination ability effect value of Yihui 1577 was 0.226 and that of Minghui 63 was –0.113, the former was superior to the latter.
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