Identification of QTL for Fusarium root rot resistance in common bean.
Journal of Crop Improvement ; 2013 [Vol.4] Pages:-
Abstract
Resistance to Fusarium root rot (FRR) in common bean (Phaseolus vulgaris L.) has been determined to be a quantitative trait. The objective of this study was to identify quantitative trait loci (QTL) for resistance to FRR in a resistant line MLB-49-89A of common bean. A mapping population of 62 F4:5 recombinant inbred lines (RILs) derived from cross of K132 × MLB-49-89A was evaluated. A second population of 90 F4:5 RILs derived from cross of K20 × MLB-49-89A was used to validate the QTL identified in K132 population. A major QTL with a logarithm of odds (LOD) score of 6.1 and R2 of 34% was detected between PVBR87 and PVBR109 markers in the K132 population The same markers were significantly associated with resistance in the K20 population (R2=14%, P0.001). The QTL could facilitate marker-assisted selection to introgress resistance for FRR into the highly susceptible Andean genotypes widely grown in Uganda.
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