Genetic Diversity and Classification of Korean Weedy Rice based on RAPD Markers
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Abstract
In the preliminary screening using 92 primers, twenty-four which produced reproducible and polymorphic bands werethe accesions were used to classify 148 accessions including 11 Korean weedy rice strains and the 37 typical ecotype referenceaccesions. Wedy rice accessions were classified into three types: japonica, indica, and intermediate, whereas the typical ecotypereference accesions were clearly grouped into three distinctive types: temperate japonica, tropical japonica, and indica. Com-parisons of the genetic similarity were made within and between the six groups identified from the cluster analysis. Comparisonsof the similarity were also made between the six groups and the four reference groups of Korean elite rice cultivars, landraces,Shareibyeo strains, and weedy strains from China. The japonica and indica type weedy accessions showed about 50% genetic sim-ilarity (GS). The japonica type weedy accessions had the highest GS coeficient of 0.725 with the Shareibyeo accessions. In con-trast, indica type weedy accessions had the highest GS (0.619) with the Anhui weedy strains. The intermediate type, on the othershowed very high GS and the 109 polymorphic bands failed to discriminate among several accessions collected from the sameregion. These results might suggest that weedy rice evolved in the area spontaneously and did not experience much changes. Thepresent study also indicated that weedy rice occurred in the Korean peninsula where no wild rice is present.
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