Genetic Variability Studies in Free Threshable and Spot Blotch Resistant Derived Dicoccum Lines
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Date
2011
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Abstract
Dicoccum wheat (Triticum dicoccum (Schrank) Schulb) is nutritionally
superior compared to durum and aestivum. The present investigation was carried out
to study genetic variability, free threshability and spot blotch resistance in 95
advanced generation mutant lines. Development of free threshable lines which are
resistant to spot blotch (Helminthosporium sativum) is of prime requirement. These 95
mutant lines were sown along with five checks during rabi 2010-11. Observation on
yield, yield components, morpho-physiological, grain quality parameters and disease
scoring for spot blotch and rust were recorded.
Analysis of variance revealed the prevalence of significant difference among
the genotypes for all the morphological and quality parameters studied. GCV and
PCV were found to be high for seed yield per plant and tillers per plant. Heritability
and genetic advance over mean were high for thousand grain weight (g) seed yield per
plant, spike length, tillers per plant and seeds per spikelet. Quality parameters like
starch content, wet gluten and sedimentation value shown significant positive
association with yield. Among 95 mutants 15 shown immune and remaining were
resistant for spot blotch disease. Considerable amount of genetic diversity was
observed in the material with respect to tillers per plant and wet gluten. Out of thirteen
characters studied six shown direct effect on yield. Comparative study among mutants
revealed that direct mutation was superior in comparison with hybridization followed
by mutation. All the twenty RAPD primers used in the study were polymorphic.
Mutant No. 845, 873, 2292, 2758 and 2761 were found to be superior in comparison
with both durum and dicoccum parents with respect to yield and yield attributing
traits. Outstanding productive and potential mutants could be evaluated to isolate the
superior high yielding free threshable lines and resistance to spot blotch disease
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Genetics and Plant Breeding