Inheritance of resistance to sclerotinia stem rot (Sclerotinia trifoliorum) in faba beans (Vicia faba L.) |
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| Institution: | 1. Department of Agronomy, Aristotle University Farm of Thessaloniki, 570 01 Thermi, Greece;2. Department of Genetics and Plant Breeding, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;3. Department of Agronomy, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;1. Department of Plant Pathology and Microbiology, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel;2. Institute for Plant Genomics and Biotechnology, Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843, USA;3. Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706, USA;1. Florida International University, Robert Stempel College of Public Health and Social Work, School of Social Work, 11200 S.W. 8th Street, AHC5 564 Miami, FL 33199, USA;2. Simmons College School of Social Work, HSDM-Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, USA |
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| Abstract: | Stem rot, a fungal disease caused by Sclerotinia trifoliorum Eriks., is often a serious problem in many important forage legumes including faba beans (Vicia faba L.). Understanding the inheritance of resistance to the disease is essential for effective breeding of resistant cultivars. Experiments were conducted to study the inheritance of resistance to stem rot of faba beans. The F1, F2, and the backcross generations of five crosses between four resistant and four susceptible populations (Alto × Polycarpe, A-90 × Polycarpe, ILB-1814 × A-247, A-90 × A-244, VT × Tanagra) were used. The eight populations were crossed properly in the field, and progenies of F1 and F2, as well as backcross progenies of F1 with each of their parents, were evaluated for resistance to stem rot disease under controlled conditions after artificial inoculation of the plants with carrot root pieces colonized by the fungus. On the assumption that inheritance of stem rot resistance is governed by a single dominant gene, no significant differences were found between the observed and the expected frequencies of resistance for progenies, except for one cross. As the expression of resistance to the disease fits the expected ratios for a single dominant gene model, it is concluded that the inheritance of resistance to sclerotinia stem rot in the evaluated faba bean populations is controlled by a single dominant gene. |
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