Genetic variation and association analysis for grain
yield and its components in late sown wheat (Triticum aestivum L.)
Nidhi Jain2, Shailesh Marker1,
Neha Thomas2
1Department of Genetics and Plant Breeding, Allahabad School
of Agriculture
2Sam Higginbottom Institute of Agriculture, Technology &
Sciences (Formerly Allahabad Agricultural Institute) Deemed University,
Allahabad-211007
Received: 23 February 2017 Revised
Accepted: 27 April 2017
ABSTRACT
A study was undertaken to analyze the genetic variability and
correlation in bread wheat (Triticum
aestivum L.) germplasm for different quantitative traits in 46 wheat
genotypes grown in last week of December at Field Experimentation Centre of the
Department of Genetics and Plant Breeding, SHIATS, Allahabad during rabi
2012-13. The significant mean
sum of squares
for most of
the characters indicated
the presence of
substantial amount of
variability. The differences between GCV and PCV for important
characters studied indicating the less effect of environment on the expression
of these characters. The GCV was observed high for grain yield followed by
harvest index, canopy temperature, tillers per plan, grain weight per spike and
spike length. The phenotypic coefficient of variation (PCV) was exhibited high
by canopy temperature followed by tillers per plant, spike length and grain
weight per spike. High heritability coupled with high genetic advance was
observed for plant height followed by harvest index. Suggesting the
preponderance of additive gene action in the expression of these characters.
Grain yield exhibited positive and significant correlation with grain weight
per spike, spike length, grain filling period, harvest index, grains per spike,
tillers per plant, test weight, days to maturity, biological yield, plant
height and canopy temperature depression at genotypic level. Therefore
selection can be expressed upon these characters for yield improvement of wheat
in late sown condition.
Key
Words: Genetic variability, Heat stress, Late sown, Wheat
(Triticum aestivum L.)