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Genetic analysis of gene‐specific resistance to mungbean yellow mosaic virus in mungbean (Vigna radiata)

Author:
Bhanu, Akhouri Nishant, Singh, Mahendra Narain, Srivastava, Kartikeya
Source:
Plant breeding 2019 v.138 no.2 pp. 202-206
ISSN:
0179-9541
Subject:
Mungbean yellow mosaic virus, Vigna radiata, crossing, genetic analysis, homozygosity, inheritance (genetics), mung beans, parents, phenotype, progeny, recessive genes
Abstract:
Six intervarietal crosses involving two resistant and three susceptible genotypes of mungbean were attempted with the objectives to determine the mode of inheritance of gene‐specific Mungbean Yellow Mosaic Virus (MYMV) resistance. An infector row technique along with artificial inoculation was used for evaluating parents, F₁, F₂ and F₃ plants for MYMV resistance. Disease scoring for MYMV indicated that F₁s were highly susceptible as were the susceptible parents while resistant parent exhibited resistant reaction. The F₂ progeny segregated in the ratio of 9 S:3 MS:3 MR:1 R suggesting that the resistance was governed by digenic recessive genes (rₘ1 and rₘ2). When one gene (rₘ1) was present in the homozygous recessive condition in different plants, it conferred moderately susceptible (MS) reaction, whereas when other gene (rₘ2) was in homozygous condition, moderately resistant (MR) reaction was obvious. When both genes (rₘ1 and rₘ2) were present together in the homozygous recessive condition, resistant reaction (R) was observed. The F₂ segregation explained on the basis of phenotypic expression was further confirmed by F₃ segregation.
Agid:
6364295