Studies in relation to phenotypic stability in fodder oats (Avena sativa L.)
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Date
2008
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Publisher
SKUAST-K
Abstract
Ten elite genotypes of fodder oats including one high yielding released variety viz., Sabzaar were evaluated during Rabi 2006-07 across the random environments representing southern, northern and central agro-climatic regions of Kashmir valley for their forage yield, stability and quality performance as per AMMI and Eberhart and Russell models. According to both models analysis of variance revealed that all the genotypes possessed significant differences for various forage yield and quality traits. Estimation of the genetic parameters over locations revealed that the environments were significant and random. Under AMMI analysis green fodder and crude protein do not exhibit much variation and biplots could not be drawn as such no inference regarding stability of genotype through this analysis could be made, however rest of the traits exhibited considerable variation. As per Eberhart and Russell’s model the mean squares due to GxE interaction were significant for all the traits. The component analysis of environment (GxE) revealed significant mean squares for all the traits except crude protein content. Mean square into linear and non-linear components revealed that environment (linear) were significant for all the traits. Mean squares due to GxE (linear) were significant for all the traits except days taken to 50 per cent flowering. Thus, the significant mean squares for environments + (GxE) for all the traits except crude protein content has arisen due to environments (L) and linear response of the regression of the cultivars to environment. Stability performance of all the traits showing non-significant mean squares for pooled deviation and significant mean squares for pooled deviation could be precise and reliable. The good performance of different traits and their stability across the environment indicated that the genotype SKO-105 excelled for all the traits while other genotypes possessing better performance and average stability for most of these traits were SKO-109 and SKO-96. The early flowering cultivar was Sabzaar. The genotype SKO-114, SKO-12 and SKO-108 had higher ash content In-Sacco dry matter degradability was highest in SKO-90 and overall crude protein degradability was highest in the cultivar SKO-98 when samples were subjected to rumen degradation also exhibited highest dry matter degradability. Hence the cultivar SKO-105, SKO-109, SKO-96, SKO-98 and SK-90 were found to be most stable across the random locations alongwith Sabzaar.
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Description
M.Sc Thesis submitted to SKUAST Kashmir
Keywords
AMMI model, Fodder oats, In-Sacco, Genetic and Plant Breeding