U.S. Vegetable Laboratory, USDA-ARS, Charleston, SC 29414.
Plant Dis. 2019 May;103(5):984-989. doi: 10.1094/PDIS-09-18-1677-RE. Epub 2019 Mar 11.
Fusarium wilt race 1, caused by the soilborne fungus Schlechtend.: Fr. f. sp. (E.F. Sm.) W.C. Snyder & H.N. Hans (), is a major disease of watermelon () in the United States and throughout the world. Although Fusarium wilt race 1 resistance has been incorporated into several watermelon cultivars, identification of additional genetic sources of resistance is crucial if a durable and sustainable level of resistance is to be continued over the years. We conducted a genetic mapping study to identify quantitative trait loci (QTLs) associated with resistance to race 1 in segregating populations (F and recombinant inbred lines) of (citron melon) derived from the race 1 resistant and susceptible parents USVL246-FR2 and USVL114, respectively. A major QTL () associated with resistance to race 1 was identified on chromosome 9 of USVL246-FR2. This discovery provides a novel genetic source of resistance to Fusarium wilt race 1 in watermelon and, thus, an additional host-resistance option for watermelon breeders to further the effort to mitigate this serious phytopathogen.
枯萎病 1 号小种是由土壤真菌 Schlechtend.: Fr. f. sp. （E.F. Sm.）W.C. Snyder & H.N. Hans 引起的，是美国和全球西瓜的主要病害。尽管已经将枯萎病 1 号小种抗性纳入了几个西瓜品种中，但如果要多年保持持久和可持续的抗性水平，识别额外的遗传抗性来源至关重要。我们进行了一项遗传图谱研究，以鉴定源自抗性和易感亲本 USVL246-FR2 和 USVL114 的分离群体（F 代和重组自交系）中与 1 号小种抗性相关的数量性状位点（QTL）。在 USVL246-FR2 的第 9 号染色体上鉴定到与 1 号小种抗性相关的主要 QTL（）。这一发现为西瓜枯萎病 1 号小种提供了一个新的遗传抗性来源，因此为西瓜培育者提供了另一种宿主抗性选择，以进一步减轻这种严重的植物病原菌。
