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《Molecular Plant Breeding》 2005-03
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Mutagenic Improvement of Grain Weight of Superior Heterosis Rice Restoring Line 9311

Chen Zhongming1 Wang Xiu'e 2* 1 Jiangsu Tomorrow Seed Co., Ltd., Nanjing, 210014; 2 State Key Laboratory of Cr op Genetics & Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 2 10095  
A grain size mutant of restoring line 9311, M316, was identified by EMS treatment. It's grain length and 1000-grain weight was increased from 6.9mm to 8.0mm and 31g to 35.6g, with an increased rate of 15.9% and 14.8%, respectively. However, the seed density of M316 was significantly decreased from 6.77 seeds/c m to 5.61 seeds/cm, with a decrease rate of 17.1%. As a result of these factors, single plant yield was decreased by 8.7%. Phenotype segregation observation of this trait in generations M2, M3 and M4 indicated that this was an accessive mut ation. Interestingly, compared with the three original hybrids Liangyoupeijiu, Y ueyou 938 and Fengliangyou No.1, the F1 hybids between the mutant and sterile li nes Pei'ai 64s, Yuetai A, and Guangzhan 63s was significantly improved in 1000-g rain weight, panicle length, and number of spikelets per panicle, but the seed d ensity and other important traits were not decreased. Therefore, single plant yi eld of the new hybrids were increased in varying degrees, indicating that the mu tant were obviously improved in both the combining ability and grain weight.
【CateGory Index】: S511.21
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