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Inter-relationship and Path Coefficient Estimation in Rice under Salt Stress Environment |
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V.R. Pandey,
P.K. Singh,
O.P. Verma and P. Pandey |
Abstract:
Crop yield mostly depends on net result of yield contributing traits, action
of genes and their interactions with environment. Hence, an experiment was undertaken
with fifty two rice genotypes to know genetic relationship of various polygenic
traits on yield. All the genotypes were grown in a randomized complete block
design with three replications during Kharif 2009 under salt affected soil (pH
of 9.2 and EC 1.61 dS m-1). Results showed that substantial amount
of variability exists in the entire gene pool for all traits studied validated
ample scope of selection. Magnitude of Phenotypic Coefficient of Variation (PCV)
along with Genotypic Coefficient of Variation (GCV) was recorded high for biological
yield per plant; moderate for grain yield per plant, spikelets per panicle and
flag leaf area. However, days to 50% flowering, days to maturity, plant height,
panicle length, spikelet fertility (%), 1000-grain weight and harvest-index
had low estimates. High heritability coupled with high genetic advance in percent
of mean were observed for biological yield per plant, grain yield per plant,
spikelets per panicle and flag leaf area while, the 1000-grain weight and harvest-index
suggesting preponderance of additive gene action in the expression of these
characters. Grain yield per plant exhibited a very strong positive association
with biological yield per plant, flag leaf area and spikelet fertility at phenotypic
and genotypic level which indicated that these traits were the strongest associates
of grain yield per plant. However, significant negative correlation was observed
in case of harvest-index with biological yield per plant, and 1000-grain weight
with effective tillers per plant. The genetic reasons for this type of negative
association may be linkage or pleiotropy. Path analysis identified harvest-index,
days to maturity and effective tillers per plant, 1000-grain weight and flag
leaf area and panicle length as major direct contributors. Hence, these traits
should be given much emphasis on the selection criteria for genetic improvement
of rice yield in salt stress environment.
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How to cite this article:
V.R. Pandey, P.K. Singh, O.P. Verma and P. Pandey, 2012. Inter-relationship and Path Coefficient Estimation in Rice under Salt Stress Environment. International Journal of Agricultural Research, 7: 169-184.
DOI: 10.3923/ijar.2012.169.184
URL: https://scialert.net/abstract/?doi=ijar.2012.169.184
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