A Citrullus amarus mapping population segregating for resistance to Fusarium oxysporum f. sp. niveum race 2 and Papaya ringspot virus was used to identify novel QTL, important for the improvement in watermelon disease resistance. 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.

中文翻译：

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尖孢镰刀菌f抗性QTL图谱。sp。Citrullus amarus 中的 niveum 种族 2 和木瓜环斑病毒。

为抗尖孢镰刀菌 f 分离的 Citrullus amarus 作图种群。sp。niveum Race 2和Papaya环斑病毒用于鉴定新的QTL，对提高西瓜抗病性很重要。USDA Citrullus spp 的多种疾病筛查。种质资源收集突出了 Citrullus amarus（香橼瓜或野生西瓜）作为增强现代西瓜品种（Citrullus lanatus）对西瓜广泛的真菌、细菌和病毒病害的抵抗力的资源的价值。我们已经产生了一个 C. amarus 遗传种群，该种群对两种重要的西瓜疾病具有抗性：枯萎病（由真菌 Fusarium oxysporum f. sp. niveum 引起；Fon race 2）和木瓜环斑病毒-西瓜株 (PRSV-W) . Fon 种族 2 抗性的 QTL 作图确定了七个重要的 QTL，主要 QTL 代表了新的抗性遗传来源和基因金字塔的机会。单个 QTL 与对 PRSV-W 的抗性相关，这符合先前研究的预期，表明西瓜中存在单基因隐性遗传。这里鉴定的抗性位点为渗入栽培西瓜以提高抗病性提供了宝贵的遗传资源。