GENETIC ANALYSIS FOR SOME FORAGE TRAITS IN OAT
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Date
2017-07
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CSKHPKV, Palampur
Abstract
The present investigation entitled, “Genetic analysis for some forage traits in oat” was undertaken to estimate the gene effects for different forage traits and to identify promising oat progenies in F3 and F4 generations of a cross PLP-1 × HJ-8. The experimental material comprising P1, P2, F1, F2 and F3 generations of a cross PLP-1 × HJ-8 was raised in Randomized Block Design during Rabi 2016-17 with three replications and data were recorded on morphophysiological, forage traits and reaction to powdery mildew resistance. Genic effects were estimated by using scaling test and generation mean analysis for traits related to forage yield. The results obtained in the present investigation with respect to generation mean analysis suggested that both additive and dominance effects were important for most of the traits. The results of scaling tests revealed the presence of non-allelic interactions for days to 50 per cent flowering, plant height, tillers per plant, leaves per plant, fresh fodder yield per plant, leaf area, days to 75 per cent maturity, dry matter yield per plant and dry matter per cent. In fresh fodder yield per plant and crude protein yield per plant additive × additive and dominance × dominance type of non-allelic interaction was observed whereas, dominance × dominance type of epistasis were present for most of the traits. Duplicate type of gene action was observed for plant height and leaves per plant, these observations imply the use of biparental approach and selection to be delayed to later generations. The study on path analysis and correlation studies in F2, F3 and F4 generations indicated the significance of sub traits like tillers per plant, leaves per plant, leaf area dry matter yield per plant, dry matter per cent, tillers per plant and crude protein yield per plant and therefore, these traits could be considered as the best selection parameters for the improvement of fresh fodder yield per plant due to their high direct and indirect contributions. Resistance to powdery mildew was governed by a single dominant gene in a cross PLP-1 × HJ-8. Evaluation of F2, F3 and F4 generations of the same cross along with parents revealed that 14.33%, 18.44% and 22.89% transgressive segregants were obtained in F2, F3 and F4 generations, respectively. Two hundred six superior progenies have been identified in F4 generation and P6-9-8, P31-5-8, P36-6-6, P46-6-4, P56-3-4, P69-3-3, P74-2-9 and P76-7-7 showed superiority for most of the forage and component traits in F4.
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