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Yunlong Yang,Chunhai Shi,Yuanfei Zhou,Jianguo Wu,Xiaoli Jin,Jianyao Shou 한국유전학회 2014 Genes & Genomics Vol.36 No.3
A dense panicle mutant (dp2) derived from theOryza sativa ssp. japonica cultivar Nipponbare through ethylmethane sulfonate mutagenesis was used in present study. Compared to the wild type, the panicle of dp2 mutantexhibited more branches and denser grains. Further more, thenumber of spikelets per panicle, number of primary branchesand secondary branches of dp2 mutant were significantlyincreased while the panicle length, and 1,000-grain weightwere significantly decreased. The results from the geneticanalysis indicated that the dense panicle phenotype wascontrolled by a single dominance nuclear gene. Polymorphicanalysis of SSR and InDel markers demonstrated that theDP2 gene was located at the long arm of chromosome 2,which was further mapped between SSR markers RM341and RM13356 in a physical region of 398 kb. Within thisregion, the RCN2 (LOC_Os02g32950) gene which wasannotated relating to the development of rice panicle wasfound. Compared to the wild type, the sequence of RCN2gene in the dp2 mutant showed that two SNPs replacementhad taken place in the promoter region (G–A) and the intronregion (A–T), respectively. The dp2 mutant could be a novelmutant of RCN2 gene and this novel mutant might be usefulfor further studies on this gene.
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