National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Rust caused by Puccinia arachidis Speg. is the most important disease on Groundnut worldwide. Limited information about nature of inheritance of rust resistance is available to peanut breeders. The investigation was undertaken to determine the mode of genetic inheritance of rust resistance in two F2 populations of groundnut. The crosses were generated by crossing resistant genotypes viz., GPBD5 and ICGV86699 with susceptible genotype TG76. The parents, F1’s and F2 populations were evaluated for rust resistance under field conditions by following spreader row technique and spraying uredinospore suspension at 30 and 40 DAS. The disease scoring was recorded using 0-9 scale. Resistance of F1's to rust in both crosses indicated that resistance was dominant over resistance. Further F1’s were selfed to generate F2 populations, where resistance segregated in a ratio of 1R:3S, with non-significant chi-square values at 5% level indicating that rust resistance in groundnut is determined by a single recessive gene. This information will be relevant for the implementation of breeding programmes focused on the development of cultivars/hybrids carrying genetic resistance to rust.
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