GENETIC VARIABILITY, CORRELATION AND PATH ANALYSIS IN A GERMPLASM COLLECTION OF SUDAN GRASS (Sorghum sudanense (Piper) Stapf.)
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Date
1999
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University of Agricultural Science, Dharwad
Abstract
Field experiment was conducted at the RfeRgfesearch Station,
Raichur during rabi/summer seasons of 1997-98 and 1998-99 to study the genetic
variability and character association in 79 accessions of sudan grass germplasm.
The experiment was laid out in 9 x 9 simple lattice design with two replications.
Observations on various quantitative characters were taken in main and two ratoon
crops. Analysis of data of both the seasons individually and pooled were carried
out and it revealed significant differences among genotypes for all the characters
studied.
Over the two seasons, six accessions gave significantly higher total
green fodder yield than the best check DFJ-1. The accession IS-3191 was the best
for green as well as dry fodder yields and other related characters followed by
accession IS-6014.
In genera!, values of various genetic variability parameters for individual
seasons were higher than the those for pooled values. Higher values of GOV,
heritability and genetic advance were obtained for leaf area, green and dry fodder
yields in main crop and green and dry fodder yields in ratoon crops. However,
lower values were observed for days to 50 per cent flowering, number of nodes,
number of leaves, leaf:stem ratio and number of tillers.
Correlation studies revealed very strong positive association of green
and dry fodder yields with plant height and leaf area. Yield was also positively
associated with number of leaves, number of nodes and crude protein and these
characters were positively associated among themselves.
Path analysis revealed that leaf area was the single major character
which exhibited highest positive direct effect on each of the three dependent
characters viz., green fodder yield, total green fodder yield and crude protein. All
other independent characters had maximum indirect contribution through leaf area.
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