International Journal of Plant Protection

C. C. Angadi ¹, B.N. Motagi ², G. K. Naidu ³, T. R. Shashidhar ²

Affiliations
1 Karnataka State Department of Agriculture, Dharwad Karnataka, IN
2 Seed Unit, University of Agricultural Sciences,Dharwad Karnataka, IN
3 Department of Genetics and Plant Breeding, University of Agricultural Sciences, Dharwad Karnataka, IN

Abstract

Single and multiple crosses were advanced from S1 to S3 generation by three selection schemes such as scheme I (single seed bulk), scheme II (selection for yield and resistance) and scheme III (selection for only resistance). Different types of selection schemes along with crosses have shown large amount of variability for pod yield and resistance attribute like leaf area affected and defoliation. Breeding methods did not differ much for heritable variation. Among the different breeding methods employed, scheme I retained higher variability for productivity attributes and scheme III for resistance components. The material forwarded through scheme I and II gave higher frequency of desirable recombinants than scheme III. However, scheme II involved additional cost and efforts as compared to single seed descent method. Based on the results, a comprehensive breeding approach for developing disease resistant and productive cultivars has been discussed.

Keywords

Groundnut, Late Leaf Spot, Selection Systems, Comprehensive Breeding Strategy

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C. C. Angadi ¹, B. N. Motagi ², G. K. Naidu ³, T. R. Shashidhar ⁴

Affiliations
1 Karnataka State Department of Agriculture, Dharwad Karnataka, IN
2 Seed Unit, University of Agricultural Sciences, Dharwad Karnataka, IN
3 Department of Genetics and Plant Breeding, University of Agricultural Sciences, Dharwad Karnataka
4 National Seed Project, Seed Unit, University of Agricultural Sciences, Dharwad Karnataka, IN

Abstract

Large amount of variability was present for pod yield (PY) and resistance attributes like leaf are affected (LAA) and defoliation percentage (DF) in most of the segregating material of groundnut. The association analyses revealed the possibility of breaking undesirable linkages by shuffling genes through three way and back crossing designs. Higher proportion of desirable recombinants for most of the character combinations were observed in these cross categories. Single and double crosses were poor in giving superior recombinants. The non-significant correlation between yield and resistance indicated the possibility of incorporating disease resistance into the adapted cultivar without affecting the yield potential. But even in back and three way crosses frequencies of superior recombinants were considerably low revealing the existence of some amount of undesirable association between characters indicating the need for reshuffling of genes through selective inter-mating.

Keywords

Groundnut, Late Leaf Spot, Resistance, Productivity, Genetic Variability, Association

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