Evaluation of major rice cultivars for resistance to bacterial seedling rot caused by Burkholderia glumae and identification of Japanese standard cultivars for resistance assessments

Breeding Science
Ritsuko MizobuchiHiroyuki Sato

Abstract

Burkholderia glumae causes bacterial seedling rot (BSR) and bacterial grain rot (BGR) in rice (Oryza sativa), both of which are important diseases in Japan. We previously evaluated major Japanese cultivars for BGR resistance and selected standard cultivars for resistance assessments. Here, we assessed the BSR occurrence rate in cultivars from the World Rice Collection (WRC) and other sources and found wide variation in resistance. Next, we evaluated major Japanese cultivars for BSR resistance and found that two Japanese landraces, 'Kujuu' and 'Aikoku', showed "strong" resistance; most others were categorized as "medium" or "medium to weak". We previously developed a near-isogenic line (RBG1-NIL) by introducing the genomic region containing RBG1, a quantitative trait locus (QTL) for BSR resistance, from 'Nona Bokra' (indica) into 'Koshihikari' (temperatejaponica). The resistance level of RBG1-NIL was "strong", indicating the effectiveness of RBG1 against BSR. The correlation between BSR and BGR resistance scores was low, indicating that it is necessary to introduce QTLs for resistance from different sources to develop cultivars resistant to both BSR and BGR. On the basis of the screening results, we selected standard cultivars f...Continue Reading

References

Jun 26, 2013·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·R MizobuchiM Yano
Jan 27, 2015·Molecular Breeding : New Strategies in Plant Improvement·Ritsuko MizobuchiMasahiro Yano
Apr 13, 2018·International Journal of Molecular Sciences·Pankaj Kumar SinghTilak Raj Sharma

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