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Gene Effects and Interaction Analysis for Yield and Quantitative Traits in Bread Wheat (Triticum Aestivum L.) Under Normal and Terminal Heat Stress Conditions Parkash Ved Department of Plant Breeding and Genetics, Rajasthan Agricultural University, Agricultural Research Station, Durgapura, Jaipur-302018 Abstract Six generations (P1, P2, F1, F2, B1 and B2) of two crosses namely PBW 373 x Raj 3077 and Raj 3777 x Raj 3077 were evaluated in randomized block design for days to heading, flag leaf area, grain yield per spike and grain yield per plant under normal and late sown (to create terminal heat stress) conditions. The data of six generations were subjected to individual scaling tests and joint scaling test to detect epistasis. Additive-dominance model was adequate only in cross PBW 373 x Raj 3077 under normal sown condition for grain yield per plant and in remaining cases epistasis was observed. The predominant role of dominant gene effects was observed for most of the traits studied in both the crosses. Among the interaction effects both additive x additive (i) and dominance x dominance (I) were important for most of the traits. Duplicate epistasis was noticed for all the traits as h and I were with opposite signs. Top Index Words Bread wheat, generation means, epistasis, yield components. Top | |
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