Mapping QTLs for partial resistance to blast in rice
2003
Talukder, M.Z.I. | Leifert, C. | Price, A.H.
A population of 100 F6 recombinant inbred lines (RILs) produced by single-seed descent from a cross between Azucena (japonica) and Bala (indica) was evaluated for partial resistance to blast in the greenhouse. A genetic map developed from this population containing 135 markers on 17 linkage groups covering 1,680 cM was used to map the QTLs with composite interval mapping. Five QTLs were identified for disease severity using the 3 LOD threshold - one each on chromosomes 1, 10 and 12 and two on chromosome 4. Altogether, these five QTLs accounted for 58% of the phenotypic variation in the population. Two loci, one each on chromosomes 1 and 4, were detected for number of lesions per leaf and together they accounted for 17% of the phenotypic variation. All of these QTLs reflected a positive effect from the Azucena allele. A total of five, two and four QTLs were detected for lesion length, lesion width, and lesion area, respectively, with a large-effect QTL on chromosome 12.
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