Search for genetic resources resistant to brown spot in NIAS core collections of Japanese rice landraces and world rice

Matsumoto, Kengo; Seta, Satomi; Ota, Chihiro; Ohno, Teppei; Ota, Yoshihide; Nakayama, Yukinori; Yamakawa, Tomohiro; Sato, Hiroyuki

doi:10.1270/jsbbr.19.155

Cited by 4 publications

(7 citation statements)

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“…In this study, we attempted to identify BS resistance QTLs within a BIL population derived from a cross between 'Dawn' and 'Koshihikari'. Hori et al (2012) reported that a large number of agronomic traits in rice are correlated with heading date, and in previous studies we observed negative correlations of disease score with heading date (Matsumoto et al 2017a(Matsumoto et al , 2017b. In the present study, significant negative correlations between disease score and DTH in the BIL population were observed for three years.…”

Section: Bs Discussionsupporting

confidence: 75%

“…Our research group reported that several cultivars from outside Japan are more resistant to BS than Japanese cultivars ( Matsumoto et al 2017a ). Because BS is such a problem in Japan, it is important that BS resistance QTLs from these other cultivars be introduced into Japanese rice cultivars.…”

Section: Discussionmentioning

confidence: 97%

“…Several research groups, including ours, have reported genotypic variability among rice cultivars for BS resistance and have conducted quantitative trait locus (QTL) analyses of BS resistance ( Mizobuchi et al 2016 and references therein, Matsumoto et al 2017a ). Although we have recently detected several QTLs for BS resistance, none of them explained over 30% of the phenotypic variation in the analysis ( Matsumoto et al 2017b , Sato et al 2008 , 2015 ).…”

Section: Introductionmentioning

confidence: 99%

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QTL analysis for brown spot resistance in American rice cultivar ‘Dawn’

et al. 2021

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Rice brown spot (BS), caused by Bipolaris oryzae, causes yield loss and deterioration of grain quality. Using single-nucleotide polymorphism (SNP) markers, we conducted quantitative trait locus (QTL) analysis of BS resistance in backcross inbred lines (BILs) from a cross between an American rice cultivar, 'Dawn' (resistant), and 'Koshihikari' (susceptible). Four QTLs for BS resistance were detected in a three-year field evaluation, and 'Dawn' contributed the resistance alleles at all QTLs. The QTL with the greatest effect, qBSR6-kd, explained 15.1% to 20.3% of the total phenotypic variation. Although disease score and days to heading (DTH) were negatively correlated in all three years, qBSR6-kd was located near a QTL for DTH at which the 'Dawn' allele promoted heading. Another BS resistance QTL (qBSR3.1-kd) was unlinked to the QTLs for DTH. Therefore, these two QTLs are likely to be useful for breeding BS-resistant varieties without delaying heading. The other two BS resistance QTLs (qBSR3.2-kd and qBSR7-kd) were located near DTH QTLs at which the 'Dawn' alleles delayed heading. The QTLs reported here will be good candidates for developing BS-resistant cultivars.

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Section: Bs Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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QTL analysis for brown spot resistance in American rice cultivar ‘Dawn’

et al. 2021

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“…Mienoyume is highly susceptible to BS and is more susceptible than Koshihikari (Matsumoto et al 2017a). Here, we developed NILs with resistance to BS by using qBSfR11, derived from Tadukan, which had been identi ed as a major QTL responsible for resistance to BS (Sato et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…It has resistance to rice blast owing to the presence of the resistance gene Pita-2, but not to BS (Yamakawa et al 2002). In our previous study, Mienoyume was one of the varieties most susceptible to BS of about 140 accessions including NIAS core collections of Japanese rice landraces and world rice (Matsumoto et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

Breeding and Characterization of The World’s First Practical Rice Variety With Resistance to Brown Spot (Bipolaris Oryzae)

Matsumoto¹,

Ota²,

Yamakawa³

et al. 2021

Preprint

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Background: Brown spot (BS) caused by Bipolaris oryzae is a serious disease of rice and decreases grain yield. Breeding for BS resistance is an economical solution but has not hitherto been achieved.Results: To develop a practical BS-resistant variety, we introduced a chromosomal segment including a quantitative trait locus (QTL) for BS resistance, qBSfR11, derived from the BS-resistant local resource ‘Tadukan’, into the genetic background of the high-yielding but susceptible ‘Mienoyume’. Resistance is controlled by a single recessive gene in a 1.3-Mbp region. We named this gene bsr1 (brown spot resistance 1). The near-isogenic line bsr1-NIL had a greater yield with larger grain width than Mienoyume but similar other agronomic traits in fields where BS was mild; it had a significantly lower BS disease score and a 28.8% higher yield in fields where BS was more severe, and it showed resistance to multiple isolates of BS fungus. It showed stable resistance to BS and had excellent agricultural traits in the presence of BS.Conclusions: We developed the bsr1-NIL with resistance to BS and applied it for variety registration to Ministry of Agriculture, Forestry and Fisheries in Japan as ‘Mienoyume BSL’. It is the world’s first practical breeding variety with resistance to BS.

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