Variability and Association Studies in M6 Generation of Isabgol [Plantago ovata Forsk.]
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Date
2009
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Publisher
MPUAT, Udaipur
Abstract
The present investigation entitled “Variability and association studies in
M6 generation of Isabgol [Plantago ovata Forsk]” was carried-out with thirty
five M6
progenies of isabgol. The material was planted during rabi season of 2007-
08 at research farm of Department of Plant Breeding and Genetics, RCA, MPUAT,
Udaipur in RBD with 3 replicates.
Observations were recorded for sixteen traits i.e. yield and its component
traits and some quality parameters.
Analysis of variance revealed that mean square due to genotypes were
significant for eleven characters. It suggested that the experimental material
possessed considerable variability for these eleven traits. Per se performance of DR
2 and PN 87 were superior for most of the traits viz. days to 75% maturity, number
of tillers per plant, biological yield per plant, seed yield per plant, swelling factor,
husk yield per plant, husk yield per unit seed weight, harvest index, test weight,
total phenolic compounds in leaves and per cent disease index at 90 DAS.
Higher magnitude of GCV and PCV in isabgol recorded for percent disease
index at 90 DAS and total phenolic compounds in leaves and moderate for husk
yield per plant, seed yield per plant and harvest index. Highest estimate of
heritability was observed for the trait total phenolic compounds in leaves, followed
by percent disease index at 90 DAS and husk yield per plant. High genetic gain
was observed in percent disease index at 90 DAS and total phenolic compounds in
leaves; moderate values were recorded for the husk yield per plant, seed yield per
plant, harvest index and husk yield per unit seed weight. A high heritability value
with high genetic gain was observed in percent disease index at 90 DAS and total
phenolic compounds in leaves.
There was positive correlation between seed and husk yield per plant. Both
the characters had positive correlation with biological yield per plant, harvest index
and test weight. Seed yield also had positive correlation with number of tillers per
plant. Similarly, husk yield per plant positively correlated with husk yield per unit
seed weight and swelling factor. These correlated characters either had positive or
no correlation between themselves except tillers per plant that had negative
correlation with husk yield per unit seed weight, swelling factor and test weight.
Path analysis of seed yield per plant revealed that number of tillers per
plant and test weight had high direct effect. The correlations of these two
characters were also significant positive. Path analysis of husk yield per plant
revealed that seed yield per plant and test weight had high positive direct effect.
The correlations of these two characters were also significant positive.
The significance of V statistics revealed significant variability among the
genotypes over these characters. The D2 ranged from 4.2 (between PN 104 and PN
108) to 287.14 (PN 44 and PN 15). On the basis of D2 analysis, the genotypes were
grouped into 13 clusters where 7 clusters were bearing single genotype only.
Cluster II contains maximum number of genotypes i.e. 8 while cluster I contains 6.
Among characters subjected to D2 analysis, total phenolic compounds in leaves
(47.53 percent) contributed maximum towards total divergence followed by
percent disease index at 90 DAS (13.82 percent). Other important characters
contributing towards genetic divergence were husk yield per plant (9.66 percent),
seed yield per plant (6.47 percent). The ranking pattern of all the three methods i.e.
divergence of each character, sum of first rank and sum of all ranks over the pairs
of genotypes were almost same. Therefore any method can be used for assessing
the contribution of characters towards D2.
To conclude the present study based over various estimates viz. variability
parameters, correlations, path analysis and genetic divergence, Genotype DR 2 was
good for seed yield, husk yield and swelling factor. It also had high mean values
for characters having positive correlation with above characters and among
themselves. Genotype PN 87 also good for above characters with high total
phenolic compounds in leaves and percent disease index at 90DAS. PN 87 and DR
2 were representing to the cluster I and cluster XII respectively and have higher
inter cluster divergence between them. Hence, these two genotypes are recommend
to utilized as parents for hybridization to obtained transgressive seggregants for
seed yield, husk yield, swelling factor, high phenolic compounds in leaves and
disease resistance.
Description
Variability and Association Studies
in M6 Generation of Isabgol
[Plantago ovata Forsk.]
Keywords
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Citation
Sevaneson and Ranwah, 2009