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Author Zhang,Y., Wang,J., Zhang,X., Chen,J.Q., Tian,D. and Yang,S.
Title Genetic signature of rice domestication shown by a variety of genes
Cultivated rice was domesticated from common wild rice. However, little is known about genetic adaptation under domestication. We investigated the nucleotide variation of both cultivated rice and its wild progenitors at 22 R-gene and 10 non-R-gene loci. A significant regression was observed between wild rice and rice cultivars in their polymorphic levels, particularly in their nonsynonymous substitutions (theta ( a )). Our data also showed that a similar proportion (approximately 60%) of nucleotide variation in wild rice was retained in cultivated rice in both R-genes and non-R-genes. Interestingly, the slope always was >1 and the intercept always >0 in linear regressions when a cultivar's polymorphism was x-axis. The slope and intercept values can provide a basis by which to estimate the founder effect and the strength of artificial direct selection. A larger founder effect than previously reported and a strong direct-selection effect were shown in rice genes. In addition, two-directional selection was commonly found in differentiated genes between indica and japonica rice subspecies. This kind of selection may explain the mosaic origins of indica and japonica rice subspecies. Furthermore, in most R-genes, no significant differentiation between cultivated and wild rice was detected. We found evidence for genetic introgression from wild rice, which may have played an important role during the domestication of rice R-genes.
Journal J. Mol. Evol.
Country China
Volume 68(4)
Pages 393-402
Year 2009
PubMed ID 19290563
PubMed Central ID -
DOI 10.1007/s00239-009-9217-6
Gene PIB SH4 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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