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Genetic polymorphism of Wx gene and its correlation with major grain quality traits in rice

, : Genetic polymorphism of Wx gene and its correlation with major grain quality traits in rice. Zhongguo Shuidao Kexue 20(6): 603-609

An experiment was conducted to analyze the allelic variation of the W-x gene in 50 non-glutinous rice varieties (lines) using molecular markers RM190 [for (CT)(n) single sequence repeat] and 484/W2R-ACCI (for G/T SNP). A total of seven homozygous (CT)(n)-type variations. namely (CT)(20), (CT)(19), (CT)(18), (CT)(17), (CT)(14), (CT)(11) and (CT)(10), heterozygous genotype (CT)(11)/(CT)(18) is were detected with RM190. of which (CT)(11) and (CT)(18) were predominant. Two hemozygous (G/G and T/T genotypes) and one heterozygous G/T Wx genotype were detected using 484/W2R-ACCI Most of the materials with a (CT)(11) of RM190 were G/G SNP of 484/W2R-ACCI, while (CT)(18) is were T/T. The materials tested were grouped into 10 categories using the two markers together. Further analysis indicated that 59.3% variance of amylose content was attributed to the polymorphism of Wx gene resulted from RM190 marker, whereas 56.1% and 24.6% of the variance in amylose content and gut consistency were respectively attributed to the polymorphism of Wx gene resulted from 484/W2R -ACC I marker. Furthermore, in the presence of SSR and CAPS markers together, 72.4% of the variance in amylose content could be explained. The application prospects of the two markers in breeding were also discussed.


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