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O. meridionalis is a wild species belonging to AA genome in the Oryza genus, which has a lot of beneficial genes for improvement of cultivated rice. In the present study, 99 chromosome single-segment substitution lines (SSSLs) were developed carrying donor segments of O. meridionalis in the genetic background of an indica cultivar, Huajingxian 74 (HJX74). The total lengths of the 99 substituted segments...