Genetic variability and association studies in F2 population of rice under sodicity
Rice is the major staple food crop in Asia and it feeds more than 70 per cent population of India. A study was carried out in rice using F2 segregating population of three cross combinations viz., ASD 16 × CSR 23, ASD 16 × Anna (R) 4 and MDU 6 × Ezhome1 in a non-randomized experimental design under sodic soil condition. Observations were recorded on 12 morphometric traits viz., days to flowering, plant height, flag leaf length, flag leaf width, number of productive tillers, panicle length, number of grains per panicle, spikelet fertility percentage, chlorophyll content, thousand grain weight, grain length breadth ratio and single plant yield. Genetic variability parameters and correlation varied from cross to cross and the traits number of productive tillers and number of grains per panicle showed high PCV and GCV. These characters also showed high positive correlation towards single plant yield with high direct effects in path analysis. Hence, these traits could be relied upon as selection indices under sodic soil conditions in rice.
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