Analysis of Quantitative Trait Loci for Pathogenic Strain Pi-1 of Resistance to Rice False Smut in Rice

doi:10.7668/hbnxb.2014.05.001

Abstract

Abstract: In order to identify the resistant gene of rice false smut in rice,a recombinant inbred line(RILs)population with 157 lines derived from an inter-subspecies cross of Daguandao/IR28 by the single seed descent method was used to detect quantitative trait loci(QTLs)conferring resistance to strain Pi-1 of rice false smut(caused by Ustilaginoidea virens(Cooke)Takahashi)in 2012 and 2013.The disease rate index of the two parents and 157 RILs caused by the strain Pi-1 of rice false smut were scored and the QTLs for rice false smut resistance were detected accordingly by QTL Cartographer software.Seven QTLs controlling false smut resistance were detected on chromosomes 2,7,8,11 and 12,respectively,with the phenotypic variance of 8.5%-17.2%.There were four QTLs detected in 2012 and 2013,respectively,and only one QTL was found in both two years,the phenotypic variation explained by this individual QTL was 13.5% and 17.2%,and the additive effects of this QTL contributed to the 9.9% and 14.3% decrease of disease index and therefore the disease resistance increased.The direction of the additive effects at five loci qFsr2a,qFsr8a,qFsr8b,qFsr11 and qFsr12 coincided with that predicted by phenotypes of the parents,and the IR28 alleles at these loci had positive effect against rice false smut while the negative effects were found in Daguandao alleles at qFsr2b and qFsr7. The qFsr11 should be useful in rice breeding for resistance to rice false smut in marker-assisted selection(MAS)program.

Key words: Rice, Rice false smut, Pathogen strains, Disease resistance, Quantitative trait locus

CLC Number:

Q78
S435

LI Yu-sheng, YANG Juan, HUANG Sheng-dong, WANG Cai-lin. Analysis of Quantitative Trait Loci for Pathogenic Strain Pi-1 of Resistance to Rice False Smut in Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(5): 1-4. doi: 10.7668/hbnxb.2014.05.001.

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