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ARS Home » Southeast Area » Charleston, South Carolina » Vegetable Research » Research » Publications at this Location » Publication #350325

Research Project: Biological, Genetic and Genomic Based Disease Management for Vegetable Crops

Location: Vegetable Research

Title: Genetics of resistance to Fusarium wilt races 1 and 2 in watermelon

item Branham, Sandra
item Levi, Amnon
item Wechter, William - Pat

Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: 2/3/2018
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The prevalent watermelon disease, Fusarium wilt, is caused by four different races (0, 1, 2, and 3) of the fungal pathogen Fusarium oxysporum f.sp. niveum (Fon). A QTL (Q1_fon1) that confers resistance to Fon race 1 in watermelon has been previously identified in multiple studies but suffers from low resolution (6.5 Mb) due to low marker density in the region. Here we present the results of a QTL-seq study of Fon race 1 resistance in Citrullus lanatus that has improved the resolution of Q1_fon1 to 1.5 Mb. Resequencing of the parents of the population and subsequent marker development further narrowed the region to 261 kb. In addition, we have identified a novel source of resistance to Fon race 1 from Citrullus amarus and compare it to a QTL for Fon race 2 resistance. KASP markers for these three Fon resistance QTL will be developed to aid in gene pyramiding into an elite C. lanatus background.