SRIRAM CRDT - MASTER SEMINAR ON A Sriram RAM/12-50 M.Sc(Ag...

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A. Sriram RAM/12-50 M.Sc.(Ag) 2 nd year A. Sriram RAM/12-50 M.Sc.(Ag) 2 nd year MASTER SEMINAR ON
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Contents Introduction Definitions Stability analysis Models Case studies conclusion
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Introduction Phenotypically stable genotypes have great importance because the environmental conditions vary from season to season and year to year. Stability in performance is one of the most desirable properties of a genotypes to be released as a variety for wide adaptations. Wide adaptation to the particular environment and consistent performance of recommended genotypes are very important for successful cultivation of genotype.
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Genotype-Environment interactions are of major importance to the plant breeder in developing improved varieties. When varieties are compared over a series of environments, the relative rankings usually differ. This causes difficulty in demonstrating the significant superiority of any variety. Comstock and Moll have shown statistically the effect of large genotype-environment interactions in reducing progress from selection.
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It is important to develop genotypes having predictable performance for trait of interest with minimal genotype x environmental interactions (GEI) Lin et al., 1986 and Tai 2007. GEI are extremely important in the development and evaluation of genotypes because they reduce the genotypic stability values under diverse environments (Habert et al., 1995).
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Genotype: The genotypic effects are heritable and therefore, stable. Environment: External conditions that affects expression of gene of an individual or genotype. Genotype x Environment: Environment and interactions effects are non-heritable and can-not be fixed.
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The phenotypic value (P) measured on suitable scale is not equal to genotypic value (G) when the genotype is grown under more than one environment (E). That is, P≠G+E But, P=G+ E+ (G x E) G x E interaction underlines the very success of a scientific crop improvement programme related to stability of genotypes/varieties. It also influences the adoptive evaluation of improved strains before being released for commercial cultivation.
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Stability Analysis 1. The performance of genotype mainly depends on environmental interaction. 2. Estimation of phenotypic stability involves regression analysis. 3. An evaluation of genotypes x environmental interaction provides an idea of buffering capacity of the population under study. The low magnitude of G x E interactions indicates consistence performance of a population over variable environments. 4. The stability analysis is done from the data of replicated trials conducted over several locations or for several years on the same location or both.
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Stability Analysis Steps Stability analysis is done from the data of replicated trials over several environments.
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