واکنش تعدادی ارقام لوبیا نسبت به قارچ Fusarium oxysporum f. sp. Phaseoli، عامل پژمردگی فوزاریومی

Bean is an important plant due to having 20-25% protein and planted all over the world. Bean have the third position in terms of cultivated area and production rate after soybeans and peanuts. Due to its ability to fix atmospheric nitrogen in the roots, this plants also cause fertility and improves soil properties. Many important diseases and pests affect the growth and yield of these plants and one of the most important pathogen is bean wilt caused by Fusarium oxysporum f. sp. phaseoli, which causes yellowing, wilting and necrosis of the plant, especially in areas with high temperature and drought during the growing season. The use of resistant cultivars is one of the main and very effective ways to control this disease. In this research, the reaction of five bean cultivars, including Ofogh, Yaghut, Saleh, Gholi, and Talash, against the fungal pathogen was examined in a completely randomized design with four replications under greenhouse conditions. In the two-leaf stage of beans, the suspension of fungal pathogen in the concentration of 106 spores per ml was inoculated to the crown area of the plant. After the appearance of disease symptoms, its severity was recorded in four-time stages with an interval of seven days, and the area under disease progress curve was calculated. To check the significant difference between the mean of disease severity in the studied cultivars, the Kruskal-Wallis non-parametric test was used at the five percent probability level in SPSS software. According to the obtained results, the cultivars of Ofogh, Yaghut, Saleh and Gholi had the highest amount of area under disease progress curve and the shortest disease incubation period, respectively and so were known as susceptible ones. The variety of Talash had the lowest amount of AUDPC and longest disease incubation period and then was determined as moderately susceptible against pathogen.