QTL Analysis of Ascochyta Blight Resistance in Chickpea

Authors : Mücella TEKEOĞLU*

Pages : 183-187

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Publication Date : 2004-06-01

Article Type : Research Paper

Abstract :Recent advances in quantitative trait loci insert ignore into journalissuearticles values(QTL); analysis have facilitated studies on Ascochyta blight, caused by Ascochyta rabiei Pass insert ignore into journalissuearticles values(Lab.);, resistance in chickpea insert ignore into journalissuearticles values(Cicer arietinum L.);. Using a recombinant inbred line insert ignore into journalissuearticles values(RIL); population derived from an interspecific cross between C. arietinum and C. reticulatum, the same 2 QTLs conferring resistance to Ascochyta blight were identified at 2 locations by interval mapping. Genotype X environment insert ignore into journalissuearticles values(G x E); interaction was significant both between years at the same location and between locations. The effect of QTL-1 on linkage group 8 insert ignore into journalissuearticles values(LG-8); was greater than that of QTL-2 on LG-4 at Pullman while the effect of QTL-2 was higher than that of QTL-1 at Eskişehir. Dissection of QTLs with molecular markers provides a better understanding of resistance to Ascochyta blight in chickpea. Validation of both QTLs in a second environment promises the application of marker-assisted selection insert ignore into journalissuearticles values(MAS); for this trait. Changes in magnitudes of the QTL`s effect in 2 locations indicate possible differences in pathogen populations and environmental interactions.
Keywords : Chickpea, Ascochyta blight, quantitative trait locus, recombinant inbred line, molecular markers