Genetic Investigation of Resistance to Beet Necrotic Yellow Vein Virus

Management of rhizomania includes planting in cool soils, proper irrigation and soil fumigation with methyl bromide. However, breeding for resistance to BNYW is the most critical aspect of rhizomania control In this study, the inheritance of resistance to beet necrotic yellow vein virus (BNYW) in B. vulgaris subsp. maritima. wild beet (WB) accession WB42 was investigated. Crosses between resistant source and susceptible parents were carried out and F1, F2 and BC1 populations were obtained . Another source of resistance , B. vulgaris subsp vulgaris, accession Holly-1-4, was also crossed with WB42 and population of F2 was obtained Virus concentrations in WB42 and its F1, F2and BC1 populations were investigated by DAS-ELISA in greenhouse conditions Observed ratios of susceptible and resistant plants in F2 and BC1 populations of WB42 were confirmed 3:1 and 1:1 ratios, respectively and adjusted X test were not statistically significant(P:s;0.05). This result was in agreement with hypothesis of one dominant major gene. Segregation of plants in F2 populations obtained from crosses between Holly-1-4 and WB42 revealed that the resistant genes in Holly1-4 and WB42 were nonallelic and linked loci with approximately distance of 35 eM