[Objectives]q SS-9 controlling seed storability was identified using backcross-inbred lines( BILs) derived from the backcross Koshihikari( japonica) / Kasalath( indica) / / Koshihikari and‘Kasalath'chromosome segment substitution lines( CSSLs) in a‘Koshihikari'genetic background in our previous study. Based on these results,q SS-9 was further fine-mapping in the present study.[Methods]Effect and stability of the‘Kasalath'allele of q SS-9 were validated using a chromosome segment substitution line,SL226,whic...