CucCAP researchers identified a major QTL associated with sulfur tolerance in a melon mapping population. Genetic markers were developed for the major QTL and can be used to incorporate sulfur tolerance in melon breeding programs.
The CucCAP team met with project stakeholders for their fourth annual progress report in June 2020.
CucCAP economists developed models showing potential for economic returns for cucurbit crops in multiple production regions. Economic variables such as interest rates, input costs, production windows and existing crop budgets were collected to develop representative farms for production of cucurbit crops
The cucumber line WI2757 has been an important sources of disease resistances for cucumber breeding, but it has some drawbacks including later flowering and poor growth under field conditions. The genetic basis for these traits is not known. CucCAP researchers conducted molecular mapping using populations involving WI2757, and uncovered a large paracentric inversion of about 10 megabases in length on cucumber chromosome 1 of WI2757. They found that inversion region harbors genes or quantitative trait loci for fruit length, diameter, fruit shape, fruit number, and flowering time.
CucCAP Vegetable Pathology and Crop Production Extension Specialists published plant disease management reports and Cucurbit cultigen evaluations from recent field trials. These reports provide valuable information for cucurbit crop producers, seed companies and other CucCAP stakeholders.
CucCAP scientists and collaborators provide an extensive review of the literature to systematically document genes for simply inherited traits, QTL for 130 quantitative traits, and develop recommendations for QTL nomenclature in cucumber. In a separate study, researchers conducted comparative analysis on the genetic basis of fruit size and shape variation among cucumber, melon and watermelon, and revealed both conserved and unique genetic architecture of fruit size/shape variation among cucurbit crops.
Multiple disease screens of the USDA watermelon germplasm collection have highlighted the value of wild type watermelons as a source for enhancing resistance to diseases in modern watermelon cultivars. CucCAP researchers collaborated with Sakata Seed America on generating genetic populations and on conducting genetic analyses to identify genetic loci that confer resistance to Fusarium wilt and papaya ring-spot virus.
The occurrence of powdery mildew of watermelon has significantly increased in recent years. While the majority of the watermelon varieties evaluated in South Carolina were susceptible to powdery mildew, the seedless variety Suprema and seeded variety Declaration were relatively less susceptible and the commercial pollenizers Lion, SP5 and SP6 were resistant across three years of testing. Because of the frequent […]