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Genetic analysis of forage yield and
quality in oats (Avena sativa L.)
Firdous Ahmad Nehvi
Dr. Shafiq A. Wani
PhD
1999
Avena
sativa,
Genetic
analysis,
Heritability, Genotypic ,Correlations
ABSTRACT
Triple Test Cross (TTC) design was used in oats (Avena sativa L) to detect
epistasis, and estimate magnitude of genetic variances and other parameters, Twenty four
true breeding genotypes designated as lines were used to generate 72 TTC families by
crossing each line with two testers (Sabzaar and Blacknip) and their F1’. These were
evaluated under two random environments (locations) in randomized block design with
three replications.
Observations were recorded on maturity, morphological, yield and yield
component and quality traits, Significant variation among progenies were observed for all
the traits, indicating presence of high level of genetic variability, significant G x E
interaction was also observed for all the traits.
Analysis of variance for test of epistasis revealed significant epistasis (I) ; for days
to 50 per cent flowering, number of leaves per plant, green and dry leaf and stem weight
per plant, and green and dry fodder yield per plant in both the environments.
Both additive (i) and non-additive (j + I) interactions were significant for all the
traits except days to 50 per cent flowering, plant height, number of tillers per plant, dry
leaf weight and protein content in both the environments. Sums and differences were
highly significant for all the traits, indicating importance of both additive and dominance
genetic variances for these traits. G x E interaction revealed greater sensitivity of additive
genetic variance to environmental change. Most of the traits revealed higher magnitude
of additive component (D), partial and ambidirectional dominance.
High heritability (broad sense) was demonstrated by all the traits, while heritability
(narrow sense) exhibited medium estimates for most of the traits except for dry stem
weight and dry fodder yield that showed high estimates. Highest level of genetic gain
(per cent of mean) was observed for protein content, while days to 50 per cent flowering
revealed lowest genetic gain.
Genotypic correlation were positive and significant among the yield component
traits and the green fodder yield per plant was result of direct contribution from green leaf
and stem weight (Biomass) per plant. Most of the other traits contributing to green fodder
yield were having high indirect effect via these two traits.
-o-