Abstract:

Abstract: The restore or remain characteristics of 72 rice germplasm resources from Guangdong province were distinguished based on natural seed setting, and theirs heterosis of main agronomic characters were preliminary observed based on index of competition vigor. The results showed that 45 Guangdong resources had restoring character to male-infertile lines, 8 resources had maintaining character to male-infertile lines and 19 resources had restoring and maintaining character to male-infertile lines. The 45 hybrid combinations might be divided into 3 groups by using principal component analysis and cluster analysis based on competition superiority. Group I had 18 combinations, with the positive competition superiority of plant height, panicles of per plant and spikelets of per panicle, the negative competition superiority of the period of from sowing to heading, filled spikelets per panicle, seed setting, 1000-grain weight and grain weight per plant. Group II had 11 combinations, with the positive competition superiority of panicles per plant, spikelets per panicle, filled spikelets per panicle and grain weight per plant, the negative competition superiority of other traits. Group III had 16 combinations, with the positive competition superiority of panicles per plant and spikelets per panicle, the negative competition superiority of other traits. Among the 57 hybrid combinations, the brown rice rates of 12, 20 and 18 hybrid combinations reached the first , second and third grade of the national high quality rice standards respectively. The chalky rice rates of 16, 28 and 6 hybrid combinations reached the first , second and third grade of the national high quality rice standards respectively. The head rice rate of 1 combination (Yixiang 1A/Sanhuangzhan-2) reached the second grade of the national high quality rice standards. There were more restoring types among germplasm resources from Guangdong province. Competition superiority of panicles of per plant, spikelets of per panicle and chalky rice rates were significant.