Abstract
It is a matter of fact that essentially derived varieties (EDV) exist in rice breeding in China, which impact breeding innovation negatively. This study explores the potential of using identity score (IS) method, which was originally developed by animal breeding and population genetic society, in determining essentially deviated rice male sterile (MS) lines released by “two-way hybrid rice system”. Six MS lines plus a control line, Nongken 58, which is an autonomous mutation donor of Nongken 58S, are analyzed with IS. Our results show that IS can determine similarity between rice lines to a very good level, with superiority on genome-wide coverage and accuracy when compared with NYT 1433-2007, which is the present rice authenticity standard. It is noteworthy that the 2 EDV lines identified by our study show enough polymorphisms when tested by simple sequence repeat (SSR), which suggests that it should call for challenges for SSR based authenticity test as required by the present national standards. Discussions on how to push forward rice breeding with implementation of IS are also covered.
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