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STUDIES ON STABILITY ANALYSIS FOR GRAIN IRON AND ZINC CONCENTRATIONS IN RICE (Oryza sativa L.) GENOTYPES

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(STUDIES ON STABILITY ANALYSIS FOR GRAIN IRON AND ZINC CONCENTRATIONS IN RICE (Oryza sativa L.) GENOTYPES)

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2015
SUDHEER KUMAR, S
PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
D9763;

The present investigation entitled “STUDIES ON STABILITY ANALYSIS FOR GRAIN IRON AND ZINC CONCENTRATIONS IN RICE (Oryza sativa L.) GENOTYPES” was undertaken with thirty seven rice genotypes including two checks at three different locations situated at different agro-climatic regions of TELANGANA viz., Directorate of Rice Research farm at ICRISAT, Medak (Central Telangana Zone), Regional Agricultural Research Station, Jagtial (Northern Telangana Zone) and Agricultural Research Station, Kampasagar (Southern Telangana Zone) for studying stability for ten characters viz., days to 50 per cent flowering, plant height, panicle length, number of productive tillers per plant, total number of grains per panicle, number of filled grains per panicle, grain Iron content, grain Zinc content, 1000- grain weight and grain yield per plant. At three locations, the analysis of variance indicated significant variation among the genotypes for all the characters studied. The pooled analysis of variance indicated significant variation among the environments, genotypes and Genotype x Environment interaction for all the characters studied. The significance of genotype and environment interaction suggests that genotypes behaved differently in different environment. The thirty seven Genotypes showed significant differences for all the characters, when tested against pooled error and pooled deviation. It reveals that the selected genotypes are having significant variation for all characters and may not showing uniform performance in different environments. Environments showed highly significant differences for all the characters under study except thousand grain weight, when tested against pooled error and panicle length, grain Iron content and 1000 grain weight showed no significant differences, when tested against pooled deviation. It reveals that wide difference between environments. Whereas, Genotype x Environment interaction components showed highly significant differences for all the characters, when tested against pooled error and days to 50% flowering, plant height, total number of grains per panicle, grain zinc content and 1000 grain weight showed significantly differences, when tested against pooled deviation. It indicates wide differential behavior of genotypes in changing environments. The environment + (Genotype x Environment) was significant for all the characters, when tested against pooled error and all the characters shown significant differences except panicle length, number of filled grains and grain iron content, when tested against pooled deviation. It is indicating distinct nature of environments and genotype x environment interactions in phenotypic expression. Significance of Environment (linear) component for all the characters except Grain iron content, when tested against pooled error and panicle length, grain iron content and 1000 grain weight showed no significant differences, when tested against pooled deviation. It’s indicating that difference between environments and their influence on genotypes for expression of these characters. The Genotype x Environment (linear) interaction was significant for all characters except panicle length, when tested against pooled error, while it was significant for days to 50% flowering, plant height and 1000 grain weight when tested against pooled deviation showed the significant differences. This indicated significant differences among the genotypes for linear response to environments (bi) behavior of the genotypes could be predicted over environments more precisely and G X E interaction was outcome of the linear function of environmental components. Hence, prediction of performance of genotypes based on stability parameters would be feasible and reliable. The significant pooled deviations for all characters, when tested against pooled error, indicates that the performance of genotypes is entirely unpredictable in nature. Based on environmental indices, the location ICRISAT is best among three locations for grain yield, grain Zinc content and most of the yield traits. The same location may be used for further studies to expect yield stability in rice in future. Kampasagar is best location for grain Iron content. Among the genotypes studied, the genotypes RPHP104 and RPHP 107 were identified as the best genotypes at three locations, as they recorded highest mean for grain yield per plant with highest 1000 grain weight, number of productive tillers per plant and highest number of filled grains per panicle with moderate Iron and Zinc content. The genotypes RPHP 91 and RPHP 92 recorded the highest grain Zinc content along with moderate grain yield and 1000 grain weight. The mean performance of genotype RPHP 106 is high for grain Iron content along with grain yield per plant and 1000 grain weight. Among the genotypes studied for the stability analysis at three locations, the genotype RPHP 103 and RPHP 104 showed stable performance for grain yield along with moderate to high grain Zinc content. The genotype RPHP 106 showed stable performance for grain yield, grain Iron content, total number of grains per panicle and panicle length based on Eberhart and Russell (1966) stability criteria.

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