Abstract: A greenable leaf colour mutant, Baifeng A, was screened and developed after a series of backcrosses from Ⅱ32B with gamma ray irradiation. Baifeng A was an albino during the first three leaves growth stage, especially the first two leaves, the leaf colour began to turn back to green at the fourth leaf. Genetic analysis indicated that the leaf colour mutant was controlled by a single recessive gene. Baifeng A had similar flower organs and sterility characters and kept high combination ability as its parent Ⅱ32A. The growth speed of Baifeng A was slower than that of its parent when sown in either high or low density, but the mutant could survive under competition. Simulation test of hybrid rice production demonstrated that the purity of hybrid rice would be improved greatly by using leaf colour as a marker to eliminate the false hybrid rice at early stage.

Key words: hybrid rice, sterile line, leaf colour, mutant

摘要： 用γ射线诱变Ⅱ32B干种子，筛选出苗期转绿型叶色突变体，并经回交选育，获得带转绿型叶色标记不育系白丰A。经考查，白丰A苗期第1~3叶表现叶片或叶缘白化，白化程度前2叶相对较高，4叶期开始转绿。该叶色突变性状受隐性单基因控制。白丰A主要花器性状和不育特性与Ⅱ32A相似，配合力仍保持Ⅱ32A的强优特点。不论稀播或密播，白丰A苗期生长均略慢于正常绿苗对照，但不会造成竞争致死。模拟杂交稻生产和制种繁种，表明利用苗期叶色标记结合人工去杂，可有效提高田间纯度。

关键词: 杂交水稻, 不育系, 叶色标记