Genetic analysis of resistance to mungbean yellow mosaic virus in mungbean (Vigna radiata).

摘要

Mungbean yellow mosaic virus (MYMV) causes one of the most destructive diseases in mungbean. The objectives of this study were to determine the inheritance of MYMV resistance and to identify the role of each resistance gene. Six crosses between resistant and susceptible genotypes were attempted. An infector row technique was used for evaluating parents, F₁ and F₂ plants for MYMV resistance. Segregating populations were classified into four reactions viz. susceptible (S), moderately susceptible (MS), moderately resistant (MR) and highly resistant (R) based on the distribution and severity of symptoms. The F₁ plants from all six crosses and the susceptible parents showed S reactions, while resistant parents showed R reactions. The segregation of resistance responses in F₂ populations in ratios of 9 S:3 MS:3 MR:1 R suggested that the resistance was governed by two recessive genes. When one gene was present in the homozygous recessive condition in different plants, it conferred MR and MS reactions. When both genes were present together in the homozygous recessive condition, plants produced resistant reactions (R).Digital Object Identifier http://dx.doi.org/10.1111/j.1439-0523.2012.01964.x