Germplasm innovation for high-temperature tolerance from traditional rice accessions of Kerala using genetic variability, genetic advance, path coefficient analysis and principal component analysis
Beena, R. | Veena, V. | Jaslam, M. P. K. | Nithya, N. | Adarsh, V. S.
Ninety landraces of rice were evaluated for various physio-morphological traits in completely randomized design with two treatment levels, i.e. control and high-temperature stress (3–5 °C) more than the ambient condition with three replications each. The high-temperature stress was induced from panicle initiation to maturity stage by keeping the pots in a temperature-controlled green house facility. High values of genotypic coefficient of variability, phenotypic coefficient of variability, heritability and genetic advance were found for the traits number of unfilled grains/panicle and number of filled grains/panicle, indicating the pre-ponderance of additive gene action and, therefore, scope for improvement of the trait through selection. Four principle components were depicted having Eigen value > 1 and cumulative variation of 59.84%. Based on the performances of various physio-morphological traits under control and heat stress conditions, we were able to identify Karuthacheera, LN-9956-Vellakaravala (Pavumba) and Pokkali white were recorded the highest number of fertile grains under high temperature.
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