Abstract
ABSTRACTEmpoasca species leafhoppers are a major insect pest of common bean (Phaseolus vulgaris L.), that cause significant economic losses in both tropical (E. kraemeri) and temperate (E. fabae) regions of the Americas. The objective of this study was to use Insertion–Deletion (InDel) and single‐nucleotide polymorphism (SNP) markers from the BARCBean6K_3 Beadchip to identify quantitative trait loci (QTL) associated with traits related to leafhopper resistance in common bean. Traits for leaf curl and leaf burn damage, as well as Empoasca spp. nymph counts, were evaluated in an inbred backcross line population (Matterhorn*/EMP507) of beans in temperate (Michigan) and tropical (Puerto Rico) climates. Fourteen QTL associated with resistance to E. fabae and E. kraemeri were identified on five chromosomes explaining up to 66.0% of the phenotypic variation for single resistance traits. A major QTL cluster associated with multiple resistance traits and closely linked to the P color gene was detected for both leafhopper species in multiple seasons under both choice and no‐choice treatments on Pv07 (LH7.1, LH7.2, LH7.3), thus validating a similar QTL identified in previous studies. A novel QTL (LH2.2) for E. fabae nymph counts, identified on Pv02 in three seasons, may be associated with antibiosis resistance. Resistance to each leafhopper species appears to be controlled by separate genetic mechanisms in common bean as there was little overlap of QTL regions between species. These QTL could be used to develop beans with leafhopper resistance as an alternative to costly chemical controls while reducing risks to the environment and human health.
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