Generation mean and path analyses of reaction to mungbean yellow mosaic virus (MYMV) and yield-related traits in mungbean (Vigna radiata (L.) Wilczek).
2014; Volume: 46; Issue: 1 Linguagem: Inglês
ISSN
2224-8978
AutoresAra Alam, Prakit Somta, Peerasak Srinives,
Tópico(s)Plant Disease Resistance and Genetics
ResumoA study was conducted to determine types of gene action governing the resistance to mungbean yellow mosaic virus (MYMV) disease, yield components and effect of MYMV on yield-related traits. Two populations each composed of the generations P1, P2, F1, F2, P1F1 and P2F1 were developed from two crosses involving two susceptible (‘BM1’ and ‘KPS1’) and one resistant (‘BM6’) mungbean genotypes. Additive and dominant gene effects were found important in both crosses for all the traits examined. Additive gene effect contributed more to the resistance, while dominance and epitasis gene effect were found significant in most of the traits. For MYMV resistance, segregating populations were classified into four reactions, viz. susceptible (S), moderately susceptible (MS), moderately resistant (MR), and resistant (R). Segregation of the responses in F2 populations agreed with a ratio of 9 S : 3 MS : 3MR : 1 R, suggested that the resistance was governed by two recessive genes. The mean number of major genes or effective factors controlling MYMV resistance in the crosses was estimated at 1.63 to 1.75 loci. The correlation estimates revealed that MYMV had negative correlation with number of pods per plant, seeds per pod, and 100-seed weight. Path coefficient analysis indicated that MYMV significantly and negatively affects yield-related traits, and thus suggested that breeder can use yield as a target selection trait for development of MYMV-resistant cultivar(s).
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