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. Researchers in Dr. Yiqun Weng’s lab at USDA-ARS 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.
In recent years, significant progress has been made in molecular mapping and identification of genes and QTL responsible for key phenotypic traits. CucCAP scientists and collaborators led by Drs. Yuhui Wang and Yupeng Pan from Dr. Yiqun Weng’s lab at the University of Wisconsin at Madison provide an extensive review of the literature to systematically […]
Changes in Winter Squash Fruit Exocarp Structure Associated with Age-Related Resistance to Phytophthora capsici by Safa A. Alzohairy, Ray Hammerschmidt, and Mary K. Hausbeck Published Online:27 Aug 2019 Phytophthora capsici is a destructive pathogen of cucurbits causing root, crown, and fruit rot. Winter squash (Cucurbita sp.) production is limited by this pathogen in Michigan and other U.S. growing […]
Ben Mansfeld’s research focuses on cucumber resistance to Phytophthora capsici (a fungus-like plant disease that affects many crops including cucurbits). In the Grumet Lab, researchers have screened over 1300 different cucumber varieties from around the world to try to identify natural sources of disease resistance. Through this process, they identified an age-related resistance; young […]
A pickling cucumber variety trial was planted at the Saginaw Valley Research and Extension Center (43.399097, -83.694497, Frankenmuth, Michigan). Rijk Zwaan (RZ) and Bejo (BJ) seed companies donated parthenocarpic (seedless) cucumber seeds for the trial. A PDF version of this report can be found at the Midwest Vegetable Trial Report for 2018 website. Continue Reading
On location in Davis, California at Cucurbitaceae 2018, we sit down with Michigan State University pickling cucumber breeder Ben Mansfeld to chat about his work in making cucumbers more disease resistant. Read More Listen to the podcast here
Development of varieties with multiple disease resistances is always an important goal for plant breeders. Dr. Yiqun Weng’s Lab at the Vegetable Crops Research Unit in USDA-ARS, Madison, Wisconsin identified the STAYGREEN gene that is responsible for the PI 197087-derived triple-disease resistances.
Project GREEEN supported Dr. Hausbeck’s research into the emerging cucurbit downy mildew problem in Michigan.