Publication: Genetic analysis of gene-specific resistance to mungbean yellow mosaic virus in mungbean (Vigna radiata)
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Date
2019
Journal Title
Plant Breeding
Journal ISSN
Volume Title
Publisher
Blackwell Publishing Ltd
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, F 1 , F 2 and F 3 plants for MYMV resistance. Disease scoring for MYMV indicated that F 1 s were highly susceptible as were the susceptible parents while resistant parent exhibited resistant reaction. The F 2 progeny segregated in the ratio of 9 S:3 MS:3 MR:1 R suggesting that the resistance was governed by digenic recessive genes (r m 1 and r m 2). When one gene (r m 1) was present in the homozygous recessive condition in different plants, it conferred moderately susceptible (MS) reaction, whereas when other gene (r m 2) was in homozygous condition, moderately resistant (MR) reaction was obvious. When both genes (r m 1 and r m 2) were present together in the homozygous recessive condition, resistant reaction (R) was observed. The F 2 segregation explained on the basis of phenotypic expression was further confirmed by F 3 segregation. © 2019 Blackwell Verlag GmbH
Description
Keywords
inheritance, Mungbean, MYMV, resistance