Abstract: “02428 Xuan” was a japonica rice selection from wide compatibility strain 02428. It was characterised by early and concentrative blooming habit, and a large amount of pollen grains, and was especially advantageous to synchronizing the blooming time in hybrid seed production between indica and japonica. In comparison with 02428, “02428 Xuan” headed 8-9 days later, and was about 5 cm higher with broader leaves, larger panicles and smaller grains, and there existed apparent purple marker in itsapiculus. lt was identified that “02428 Xuan” had wide compatibility as the same as 02428, and obvious heterosis was shown when it crossed with indica or japonica testers. The potential breeding value of “02428 Xuan” was discussed in the utilization of heterosis between indica and japonica.

Key words: Cross between indica and japonica, Heterosis, Wide compatibility, Blooming time

摘要： 在水稻广亲和系02428群体中选出一个变异株02428选，它具有花时早而集中，花粉量大的特点；抽穗期比02428迟8～9天，植株高5厘米左右：叶片较宽，穗型较大，粒型较小，稃尖有明显的紫色标记。测交鉴定结果表明，02428选不仅保留了02428与籼、粳稻的广泛亲和性， 而且与籼、粳稻杂交的F1具有明显的杂种优势。在籼粳亚种间杂种优势利用中，它具有潜在的育种价值。

关键词: 籼粳, 杂交, 杂种优势, 广亲和性, 花时