A study was undertaken to evaluate the genetic parameters and correlation between the root and shoot traits in 50 upland rice genotypes of Manipur along with 3 checks for drought tolerance. The highest GCV and PCV values were recorded in Root fresh weight with 42% and 41.9% in controlled and 34% and 33.7% in stressed conditions. This was followed by Root dry weight (35.29% & 34.79% and 25.2% & 23.97%) in controlled and stressed conditions, respectively. The estimates of heritability were observed to be high in magnitude for all the characters. Heritability ranged from 80.32 per cent (number of tillers) and 99.7 per cent (root fresh weight) in controlled and 92.36 per cent (number of tillers) and 99.36 (shoot length) in stressed conditions. Correlation reveals highly positive and significant association at 0.01% in both controlled and stressed conditions. The large genetic variation found in this population can be exploited further to develop a few forward breeding high-yielding lines with better drought tolerance ability and used as drought donors in drought breeding programs.
The experiment was carried out during rabi 2018-19 and rabi 19-20 in the experimental field of College of Agriculture, Central Agricultural University, Imphal. Seeds of two genotypes of Indian mustard viz., CAULC-2 (local cultivar) and NRCHB-101 were exposed to three doses (1000, 1100 and 1200 Gy) of gamma rays, three concentrations of ethyl methanesulphonate (0.3, 0.5 and 0.7%) alone and in various combinations (1000Gy + 0.5%, 1100Gy + 0.5% and 1200Gy + 0.5%). Five different types of chlorophyll mutants viz., albina, chlorina, xantha, viridis and alboviridis were isolated from different treatments in M2 generation. Combination treatment of 1100 Gy+ 0.5% EMS produced the highest frequency of chlorophyll mutation in both the genotypes. Alboviridis and viridis types of mutants were more frequent in CAULC-2 and NRCHB-101 respectively, whereas albina type was least frequent in both the genotypes. CAULC-2 was more sensitive to mutagenic treatment as compared to NRCHB-101.
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