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利用60Co-γ射线照射光温敏核不育系广占63-4S的干种子,以诱发其突变,从中选育出了一个白化转绿突变体白S。该突变体在前2叶除叶尖外完全白化,第3叶部分白化,从第4叶开始白化的叶片转绿,后期恢复成白绿相间条纹色。与亲本广占63-4S相比,白S的株高较矮,叶片叶绿素含量较低,每穗颖花数较多,但其它农艺和经济性状、育性、自交结实率等均无显著差异。白S所配6个组合在单株理论产量方面的超标优势为-17.6%~21.9%,平均为0.7%。对生产上如何利用白S的白化转绿特性有效地提高水稻杂交种的纯度进行了探讨。
The 60Co-γ ray was used to irradiate the light-temperature-sensitive genic male sterile line to occupy the 63-4S dry seeds to induce its mutation, and a white-to-green mutant White S was selected. The mutant completely albino in the first two leaves except the tip, the third leaf partially albino, the leaf which began to albino from the fourth leaf turned green, and the latter recovered to a white-green and white streak color. White S had a shorter plant height, lower leaf chlorophyll content and more spikelets per spike, but no significant differences in other agronomic and economic traits, fertility and selfed seed setting rate difference. Six combinations of white S in the single theoretical yield exceeded the advantage of -17.6% to 21.9%, with an average of 0.7%. How to utilize the white-green-to-green characteristic of white S to effectively improve the purity of rice hybrids was discussed.