DETERMINATION OF DIRECTION OF PARENTS FOR USE IN CROSSES TO GENERATE VARIABILITY FOR FRUIT YIELD AND ITS COMPONENT TRAITS IN CHILLI (Capsicum annuum L.)
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Date
2022-12-06
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University of Agricultural Sciences, Bangalore
Abstract
Assessing spectrum of variability among F2 populations derived from straight andreciprocal crosses helps to explore cytoplasmic influence, if any, on trait expression. Besidescytoplasmic effects, breeding potential differences between reciprocal cross derived progeniesassist in identifying the direction of use of parents in crosses to derive segregating populations.Under this premise, reciprocal cross differences, if any, between two sets of reciprocal crosses[(ADL-4 × S-343), (S-343 × ADL-4), (BD × S-343) and (S-343 × BD)] were assessed basedon trait mean, absolute range (AR), standardized range (SR), absolute phenotypic variance(σ2
p),phenotypic coefficient of variation (PCV), genotypic coefficient of variation (GCV),transgressive segregation index (TSI) and Usefulness criterion (Uc). Further, breeding potentialof F2 populations derived from six crosses [(ADL-4 × S-343), (S-343 × ADL-4), (BD × S-343),(S-343 × BD), (AP × S-343), and (PDL-1 × S-343)] were assessed based on trait mean, AR,SR, PCV, GCV, TSI and Uc at one and five per cent selection intensities. For productivitytraits, F2 populations derived from two sets of reciprocal crosses differed significantly. F2populations derived from S-343 × ADL-4 and S-343 × BD displayed higher mean, TSI and Ucfor green fruit yield plant-1 than its reciprocal cross. Breeding potential of F2 population derivedfrom S-343 × ADL-4 irrespective of the direction of cross was better than those derived fromremaining crosses for green fruit yield plant-1. The study suggests the need to use S-343 asfemale parent to enhance variability for fruit yield and its component traits.