一个新的水稻白化转绿突变体“白S”特性的研究

Study on Characteristics of A Novel Albinotic Green-revertible Rice Mutant “Bai S”

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。

A new albinotic green-revertible rice mutant ＂Bai S＂ was bred from the photo-thermo-sensitive genie male sterile line Guangzhan 63-4S by using 60Co-,γray to irradiate its dry seeds. The first two leaves of Bai S were completely albinotic expect for leaf opex, and the third leaf was partially albinotic. The albinotic leaves of this mutant gradually became green when the fourth leaf fully emerged out, and they recovered to green-white stripe color in later period. In comparison with the wild-type parent Guangzhan 63-4S, Bai S had lower plant height, less chlorophyll content in leaf, and more glumous flowers per spike; but there were no significant differences in the other agronomic and economic traits, fertility, selfing seed setting rate and so on between Guangzhan 63 -4S and Bai S. The over-standard heterosis of 6 combinations from Bai S in single-plant theoretical yield was -17.6% - 21.9%, and its average value was 0.7%. The author discussed how to use the albinotic green-revertible feature of Bai S to effectively enhance the purity of hybrid rice seeds in the practice.