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Sources of resistance to the watermelon strain of papaya ringspot virus (PRSV-W) have been identified within the watermelon ( Citrullus lanatus ) germplasm collection. Inheritance of resistance to papaya ringspot virus-watermelon strain was studied in three  C. lanatus var. citroides  accessions: PI 244017, PI 244019, and PI 485583. The susceptible parent lines `Allsweet', `Calhoun Gray', and `New Hampshire Midget' were crossed with resistant accessions to develop F 1 , F 2 , and BC 1  generations for six families. A single recessive gene was found to control resistance to PRSV-W. The gene symbol ` prv ' is proposed for PRSV-W resistance in watermelon. Additional work is needed to determine whether the genes in PI 244017, PI 244019, and PI 485583 are allelic for resistance to PRSV-W.

Inheritance of Resistance to the Watermelon Strain of Papaya Ringspot Virus in Watermelon