GENETIC EVALUATION FOR CYTOPLASMIC INHERITANCE OF MORPHOMETRIC TRAITS AND GRAIN QUALITY PARAMETERS IN RECIPROCAL CROSSES OF RICE (Oryza sativa L.)
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Date
2021-03-03
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University of Agricultural Sciences, Bangalore
Abstract
Reciprocal crosses play an important role in identification of cytoplasmic effect and to choose right breeding programme for population improvement and development of new hybrids to meet global demand for food. In the present study, F2 and F3population ofstraight (BPT-5204 × HPR-14) and reciprocal (HPR-14 × BPT-5204) crosses along with parents were evaluated for growth and yield-attributing traits, disease resistance and grain nutrient traits. Significant differences between mean performance of 50% flowering, number of productive tillers, biomass, grain iron and carbohydratecontent in straight and reciprocal F2 and F3population were revealed cytoplasmic effect. Higher transgressive segregants for yield attributing and grain nutrient traits was observed in straight F2 and F3-populations compared to reciprocal crosses. Straight F2 and reciprocal F3 populations showed higher GCV and PCV for most of the traits. Number of tillers, number of productive-tillers, biomass and harvest index exhibited high PCV, GCV coupled with high-heritability and GAM. Inter-generation association indicated that grain yield plant-1 exhibited ignificant positive correlation with plant height, productive tillers, panicle length and grain zinc content in both the crosses. Panicle exsertion and grain carbohydrate contentshowed highest positive direct effect on grain yield-1 in reciprocal F2 and F3 populations.Genetic basis of anthocyanin pigmentation of basal leaf sheath colour and spikelets tip revealed monogenic inheritance (3:1) and leaf blade colour as inhibitory gene action (3:13). Most of F2 and F3-populations with less infestation of brown spot, sheath blight and sheath rot diseases. Fifteen mitochondrial and chloroplast specific SSRs showed polymorphism between parents, which could be utilized further to check cytoplasmic effects in the progenies. Multitrait selection index identified superior RIL’s (top ranked F3 families) in straight (1,2,6,18,21) and in reciprocal (10,87,96,98,100) crosses for all the traits and those families could beutilized for developing breeding lines for improvement of the traits. February,