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Verticillium wilt (VW) caused by  Verticillium dahliae  Kleb is one of the most destructive diseases of cotton. Development and use of a VW resistant variety is the most practical and effective way to manage this disease. Identification of highly resistant genes/QTL and the underlining genetic architecture is a prerequisite for developing a VW resistant variety. A major QTL  qVW-c6-1  conferring resistance to the defoliating isolate V991 was identified on chromosome 6 in LHB22×JM11 F 2∶3  population inoculated and grown in a greenhouse. This QTL was further validated in the LHB22×NNG F 2∶3  population that was evaluated in an artificial disease nursery of V991 for two years and in its subsequent F 4  population grown in a field severely infested by V991. The allele conferring resistance within the QTL  qVW-c6-1  region originated from parent LHB22 and could explain 23.1–27.1% of phenotypic variation. Another resistance QTL  qVW-c21-1  originated from the susceptible parent JM11 was mapped on chromosome 21, explaining 14.44% of phenotypic variation. The resistance QTL reported herein provides a useful tool for breeding a cotton variety with enhanced resistance to VW.

Molecular Mapping and Validation of a Major QTL Conferring Resistance to a Defoliating Isolate of Verticillium Wilt in Cotton (Gossypium hirsutum L.)