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[PB-0006] A novel resistance gene for bakanae disease in rice, qBK4T identified by GWAS
Sais-Beul Lee(Sais-Beul Lee),Ju-Won Kang(Ju-Won Kang),Ji-Yoon Lee(Ji-Yoon Lee),Nkulu Rolly Kabange(Nkulu Rolly Kabange ),Hyunggon Mang(Hyunggon Mang),Yeongho Kwon(Yeongho Kwon),Gi-Un Seong(Gi-Un Seong 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
[PB-0007] Gene integration approach detected QTLs Associated with Bakanae disease resistance in rice
Sais-Beul Lee(Sais-Beul Lee),Hyunggon Mang(Hyunggon Mang),Ju-Won Kang(Ju-Won Kang),Ji-Yoon Lee(Ji-Yoon Lee),Nkulu Rolly Kabange(Nkulu Rolly Kabange ),Yeongho Kwon(Yeongho Kwon),Gi-Un Seong(Gi-Un Seong 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
The genes pyramiding of bakanae disease resistance gene, qBK1 and qFfR1, in rice
Sais-Beul Lee,Su-Min Jo,Nkulu Rolly Kabange,Ji-Yoon Lee,Yeong-Ho Kwon,Ju-Won Kang,Dong-jin Shin,Jong-Hee Lee,You-Chun Song,Jun-Hyeon Cho,Jong-Min Ko,Kyung-Min Kim,Dong-Soo Park 한국국제농업개발학회 2020 한국국제농업개발학회 학술대회 Vol.2020 No.12
Fine mapping of <i>qBK1</i> , a major QTL for bakanae disease resistance in rice
Lee, Sais-Beul,Kim, Namgyu,Hur, Yeon-Jae,Cho, Su-Min,Kim, Tae-Heon,Lee, Ji-youn,Cho, Jun-Hyeon,Lee, Jong-Hee,Song, You-Chun,Seo, Young-Su,Ko, Jong-Min,Park, Dong-Soo Springer US 2019 Rice Vol.12 No.-
<P><B>Background</B></P><P>Bakanae disease is an important fungal disease caused by <I>Gibberella fujikuroi</I>. Incidence of rice bakanae disease creates serious problems in the foremost rice growing countries, and no rice variety has been found to be completely resistant to this disease. However, breeding rice varieties resistant to bakanae disease may be a cost-saving solution preferable to the application of fungicides. In this study, we aimed to determine the exact position and the candidate gene for <I>qBK1</I>, a major resistant quantitative trait locus (QTLs) for bakanae disease.</P><P><B>Results</B></P><P>The genotypes/phenotypes of recombinants selected from backcrossed recombinant inbred lines of two rice varieties, Shingwang (resistant) and Ilpum (susceptible), indicated that the locus <I>qBK1</I>, conferring resistance to bakanae disease in Shingwang, was delimited to a 35-kb interval delimited by InDel 18 (23.637 Mbp) and InDel 19–14 (23.672 Mbp). Sequence analysis of this 35-kb region revealed four candidate genes, LOC_Os01g41770, LOC_Os01g41780, LOC_Os01g41790, and LOC_Os01g41800. There were many non-synonymous SNPs in LOC_Os01g41770 and the transcript of LOC_Os01g41790 was early terminated in Shingwang, whereas there were no differences in both LOC_Os01g41780 and LOC_Os01g41800 sequences between Ilpum and Shingwang. Expression profiling of the four candidate genes showed the up-regulation of LOC_Os01g41770, LOC_Os01g41780, and LOC_Os01g41790 in Ilpum and of LOC_Os01g41800 in Shingwang after inoculation of <I>G. fujikuroi.</I></P><P><B>Conclusion</B></P><P>Utilization of marker-assisted selection (MAS) with a precise molecular marker on <I>qBK1</I> could provide an effective tool for breeding rice varieties resistant to bakanae disease. To our knowledge, this is the first report on fine mapping and candidate gene approaches for identifying the gene for <I>qBK1</I>.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1186/s12284-019-0295-9) contains supplementary material, which is available to authorized users.</P>
Lee, Sais-Beul,Hur, Yeon-Jae,Cho, Jun-Hyeon,Lee, Jong-Hee,Kim, Tae-Heon,Cho, Soo-Min,Song, You-Chun,Seo, Young-Su,Lee, Jungkwan,Kim, Tae-sung,Park, Yong-Jin,Oh, Myung-Kyu,Park, Dong-Soo Springer US 2018 Rice Vol.11 No.-
<P><B>Background</B></P><P>Bakanae or foot rot disease is a prominent disease of rice caused by <I>Gibberella fujikuroi</I>. This disease may infect rice plants from the pre-emergence stage to the mature stage. In recent years, raising rice seedlings in seed boxes for mechanical transplanting has increased the incidence of many seedling diseases; only a few rice varieties have been reported to exhibit resistance to bakanae disease. In this study, we attempted to identify quantitative trait loci (QTLs) conferring bakanae disease resistance from the highly resistant <I>japonica</I> variety Wonseadaesoo.</P><P><B>Results</B></P><P>A primary QTL study using the genotypes/phenotypes of the recombinant inbred lines (RILs) indicated that the locus <I>qBK1</I><SUP><I>WD</I></SUP> conferring resistance to bakanae disease from Wonseadaesoo was located in a 1.59 Mb interval delimited on the physical map between chr01_13542347 (13.54 Mb) and chr01_15132528 (15.13 Mb). The log of odds (LOD) score of <I>qBK1</I><SUP><I>WD</I></SUP> was 8.29, accounting for 20.2% of the total phenotypic variation. We further identified a gene pyramiding effect of two QTLs, <I>qBK</I><SUP><I>WD</I></SUP> and previously developed <I>qBK1</I>. The mean proportion of healthy plant for 31 F<SUB>4</SUB> RILs that had no resistance genes was 35.3%, which was similar to that of the susceptible check variety Ilpum. The proportion of healthy plants for the lines with only <I>qBK</I><SUP><I>WD</I></SUP> or <I>qBK1</I> was 66.1% and 55.5%, respectively, which was significantly higher than that of the lines without resistance genes and that of Ilpum. The mean proportion of the healthy plant for 15 F<SUB>4</SUB> RILs harboring both <I>qBK</I><SUP><I>WD</I></SUP> and <I>qBK1</I> was 80.2%, which was significantly higher than that of the lines with only <I>qBK</I><SUP><I>WD</I></SUP> or <I>qBK1</I>.</P><P><B>Conclusion</B></P><P>Introducing <I>qBK</I><SUP><I>WD</I></SUP> or pyramiding the QTLs <I>qBK</I><SUP><I>WD</I></SUP> and <I>qBK1</I> could provide effective tools for breeding rice with bakanae disease resistance. To our knowledge, this is the first report on a gene pyramiding effect that provides higher resistance against bakanae disease.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1186/s12284-017-0197-7) contains supplementary material, which is available to authorized users.</P>