Theoretical and Applied Genetics (2020) 133, 677-687

Sandra E. Branham, W. Patrick Wechter, Kai-Shu Ling, Bidisha Chanda, Laura Massey, Guangwei Zhao, Nihat Guner, Marco Bello, Eileen Kabelka, Zhangjun Fei and Amnon Levi (2020)
QTL mapping of resistance to Fusarium oxysporum f.sp. niveum race 2 and Papaya ringspot virus in Citrullus amarus
Theoretical and Applied Genetics 133 (2), 677-687
Abstract: Multiple disease screens of the USDA Citrullus spp. germplasm collection have highlighted the value of Citrullus amarus (citron melon or wild watermelon) as a resource for enhancing modern watermelon cultivars (Citrullus lanatus) with resistance to a broad range of fungal, bacterial and viral diseases of watermelon. We have generated a genetic population of C. amarus segregating for resistance to two important watermelon diseases: Fusarium wilt (caused by the fungus Fusarium oxysporum f. sp. niveum; Fon race 2) and Papaya ringspot virus-watermelon strain (PRSV-W). QTL mapping of Fon race 2 resistance identified seven significant QTLs, with the major QTL representing a novel genetic source of resistance and an opportunity for gene pyramiding. A single QTL was associated with resistance to PRSV-W, which adhered to expectations of a prior study indicating a single-gene recessive inheritance in watermelon. The resistance loci identified here provide valuable genetic resources for introgression into cultivated watermelon for the improvement in disease resistance.
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Database assignments for author(s): Kai-Shu Ling

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Fusarium oxysporum f.sp. niveum	Watermelon/colocynth (Citrullus)