Studies on Breeding of a New Type of Cytoplasmic Male Sterile Rice Line Quanlong A

Several types of leaf color mutants were obtained by using 300 Gy 60 Co gamma rays treatment on rice dry seeds of a cytoplasmic male sterile (CMS) maintainer line, Long te fu B(Long B). A mutant line, of which the leaves were albino at seedling stage but normal green after extention of the 4th leaf, was selected and crossed (backcrossed) to the CMS line long te fuA (Long A). Quanlong A, a new CMS line with albino leaf labelling, was thus developed. The 1st to 3rd leaves of Quanlong A(B) show marginal white,and the albnotic area is about 1/2 to 1/3 of the total area of leaf, decreases sharply in the 4th leaf and transits into normal green in late leaves. Agronomical and outcrossing characteristics of Quanlong A were similar to those of the control line, Long A, both had large panicle and grain, high rate of extruded stigma, good flowering characteristics, etc. It also showed that the combining ability of Quanlong A was similar to that of Long A by testing of hybrid F 1 plants of same restorer lines. The prospects of utilization of CMS lines with leaf color labelling was discussed in the text.