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Allele Types of Rc Gene of Weedy Rice from Jiangsu Province, China

作者：

Xiaoyan Li;Sheng Qiang;Xiaoling Song;Kaican Cai;Yajuan Sun;Zhihua Shi;Weimin Da

单位：

Weed Research Laboratory, Nanjing Agricultural University, Nanjing 210095, Chin;Weed Research Laboratory, Nanjing Agricultural University, Nanjing 210095, China

关键词：

weedy rice;red pericarp;Rc gene;allele type;origi

摘要：

Weedy rice (Oryza sativa f. spontanea), the predominant type of which has a red pericarp, seriously inhibits growth and yield of direct-seeded rice in Jiangsu Province, China. In this study, we randomly selected 10 weedy rice accessions from 10 plots in Jiangsu, and then sequenced the full lengths of their Rc genes (approximately 6.4 kb). In addition, we collected 166 different full-length Rc genes in the Oryza genus from the literature and from GenBank. A collinearity sequence analysis showed that the 10 weedy rice accessions from Jiangsu all had the same wild-type allele of the Rc gene. Single nucleotide polymorphisms indicated that the nucleotide polymorphisms (Pi = 0.19) and the proportion of segregation sites (theta w = 0.28) of the Rc genes in the 10 weedy rice accessions from Jiangsu were higher than those in 56 weedy rice accessions from USA (Pi = 0.09 and theta w = 0.07). Haplotype and phylogenetic analyses showed that the Rc genes of weedy rice accessions from Jiangsu were not revertants of the rc gene found in Asian cultivated rice (0. sativa) varieties with white pericarp. In addition, Rc gene sequences of the rice varieties Lvdao from Lianyungang, Jiangsu and Tangdao from Anhui were more similar to those of cultivated rice than to the weedy rice from Jiangsu. These findings support the continued quarantine of weedy rice and clarify the evolutionary mechanism of the red pericarp found in the weedy rice of Jiangsu.

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Allele Types of Rc Gene of Weedy Rice from Jiangsu Province, China

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