Genetic studies for various agro morphological traits and diversity analysis using in situ hybridization in different oat species

Abstract

The present investigation entitled, Genetic studies for various agro-morphological traits newlineand diversity analysis using in situ hybridization in different oat species was undertaken to study newlinethe nature and magnitude of gene action for forage and seed yield contributing traits, to understand newlinethe inheritance of powdery mildew resistance and cytological analysis of different oat species so newlineas to assess the diversity among them. Nine generations of six cross combinations namely, HJ-8 x newlinePLP-1, HJ-8 x EC-528896, HJ-8 x JPO-46, HJ-8 x Avena sterilis, HJ-8 x KRR-AK-26 and PLP-1 newlinex A. sterilisand#8223; were evaluated in compact family block design with three replications during Rabi newline2017-18. newlineSimple scaling tests revealed the inadequacy of additive-dominance model for all the newlinetraits except leaves per plant and plant height indicating the presence of non-allelic interactions for newlinethese traits. Duplicate type of gene action was observed for two characters in cross HJ-8 x PLP-1, newlinethree in HJ-8 x EC-528896, ten in HJ-8 x JPO-46, five in HJ-8 x A. sterilis, seven in HJ-8 x KRRAK- newline26 and for four characters in PLP-1 x A. sterilis. Complementary type of epistasis was newlineobserved for one character in HJ-8 x A. sterilis and two characters in HJ-8 x KRR-AK-26. The newlinebest heterotic crosses coupled with low inbreeding depression were HJ-8 x PLP-1 for dry matter newlineyield and crude protein yield per plant; HJ-8 x EC-528896 for fresh fodder yield and biological newlineyield per plant; HJ-8 x JPO-46 for seed yield per plant and HJ-8 x KRR-AK-26 for days to 50% newlineflowering and days to 75% maturity. The outcome of the present endeavour suggested that HJ-8 x newlineJPO-46 and HJ-8 x EC-528896 crosses may be exploited through biparental approach in early newlinegenerations followed by recurrent selection in later generations for harnessing desirable newlinetransgressive segregants. newlineThe segregation pattern of powdery mildew disease indicated that resistance was newlinegoverned by a single dominant gene in HJ-8 x PLP-1, HJ-8 x EC-528896, HJ-8 x JPO-46, HJ-8 x newlineA. sterilis and HJ-8 x KRR-AK-26 cross