Analysis of Correlation and Path Coefficients among Yield and Biochemical Traits under Irrigated and Reproductive Stage Drought Stress in Oryza sativa L.
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Date
2014
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VEGETOS
Abstract
Inter-relationships among yield and fourteen biochemical traits were studied under NS and RSS in
eighteen genotypes of upland rice. None of the biochemical traits showed significant phenotypic correlation
with grain yield plant-1 under irrigated (NS), while grain yield plant-1 had highly significant
and positive correlation with chlorophyll a, chlorophyll b, nitrate reductase, soluble sugar at flowering
starch at re-watering and soluble sugar in leaf under reproductive stage drought stress (RSS). This
indicated that these biochemical traits were important associates of grain yield under RSS. Out of 124
character pairs, the significant estimates of phenotypic correlations in either direction were shown by
nine character pairs in NS and 21 character pairs under RSS. In path analysis, high order positive direct
effects was exerted by soluble sugar upper root and starch at re-watering under NS and starch at
maturity, followed by leaf starch and chlorophyll a under RSS. Nitrate reductase, soluble sugar at
flowering and starch in leaf emerged as most important indirect yield contributors due to their high
order positive indirect effects on grain yield under NS.
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