National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Twelve rice genotypes with three checks were evaluated under aerobic conditions using a randomized complete block design with three replications. GE interaction was analyzed using linear regression techniques. There was considerable variation for grain yield among both genotypes and environments. The regression coefficient for genotype CR 2624 was almost unity and had one of the lowest deviations from regressions with high coefficient of determination, confirming its stability. In contrast, genotypes IR 78875-53-2-2-2 and IR 78878-53-2-2-4 showed regression coefficients less than 1, indicating insensitivity to environmental changes for grain yield. Low and consistent ARI is confirming their stability. The ARI is a yield stability parameter which is based on grain yield reduction under stress. Genotypic variation in ARI was consistent for tested genotypes among all the farmers’ field and genotypic mean ARI ranged from 0.71 to 1.65. The mean values of ARI for grain yield (GY) were less than 1, indicated the relative tolerance of this character in this study. Grain yield reduction ranged from 12.83 (Annada) to 29.70 per cent (Lalat) in aerobic rice w.r.t. irrigated condition. The significant and positive correlations were obtained between ARI and GY under irrigated condition, whereas negative association in aerobic condition. Three genotypes namely, Anjali, Lalat and IR 79906-B-5-3-3 were identified as inconsistent ARI performers over the farmers’ field. The inconsistence of the estimates in ARI across farmers’ field reflects the nature of the large G x E interactions observed for grain yield under aerobic condition. Simultaneously, CR 2624, IR 78875-53-2-2-2 and IR 78878-53-2-2-4 may be suggested for target area during dry season. Involvement of the client farmers in the breeding and selection process will be very much helpful in finding new varieties, which combine higher grain yield with the necessary characters for the farmers with water scarcity in irrigated/ lowland rice.
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