Phenotypic Comparison of Culm Elongation Among Thirty -Two Nigerian Rice Lines Under Rainfed and Deep- Water Conditions
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Abstract
The study was carried out using 32 selected Nigerian rice genotypes, to evaluate the phenotypic variation, heritability of culm elongation traits, yield components and select the best genotype for breeding purpose. The experiment was conducted in 2024, laid out in RCBD with three replications under rainfed and deep-water ecologies at Tokyo University of Agriculture, Setagaya campus, Japan. Analysis of variance using GenStat 64-bit (2.0) 2020 showed high significance (P < 0.001; P < 0.05) among all the genotypes across the environments. Under rainfed conditions, CL ranged from 50.53-112.0cm and FGPP 81.00-288.67. TOX7-3-2-3B1-1-B-1 revealed highest values for PH (173.94 cm) and CL (147.18cm), TOS 6949 exhibited highest value for PN (14.00) under deep water condition. High genetic variation was observed among the genotypes recorded in GWPH with PCV 46.63 and GCV 45.76 as a result of their genetic makeup. Broad-sense heritability showed high values (0.82-0.99). Indication of high GA in TSPP (101.59). R studio software 4.6.0 was used in analysing correlation coefficient and there was strong positive correlation between CL and PH(r=0.99＊). Genotypes 7-3-2-3-B1-1-B-1, IRESI-ITORI, TOS6949 and IITA182 demonstrated superior culm length under deep water condition which may serve as a valuable accession for flood tolerant rice breeding programs.
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