Additive main effects and multiplicative interaction analysis for storage root yield of cassava genotypes evaluated in Uganda
Genotype by environment interaction (G x E) is a major problem in the study of quantitative traits as it complicates the interpretation of genotypes evaluation experiments and makes predications of performance difficult. In order to disentangle the genetic and GxE effects and get meaningful interpre...
| Autores principales: | , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés Francés |
| Publicado: |
African Journals Online
2001
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/92704 |
| Sumario: | Genotype by environment interaction (G x E) is a major problem in the study of quantitative traits as it complicates the interpretation of genotypes evaluation experiments and makes predications of performance difficult. In order to disentangle the genetic and GxE effects and get meaningful interpretation of the results, additive main effects and multiplicattive interaction (AMMI) were used to identify patterns in the data, estimate the genotype performance by removing G x E noise that are intrinsic in cassava genotypes and determine genotype performance in specific environments. The proportion of variation of treatment sum of squares (SST) due to genotypes (79.7%) was much larger than the proportion of SST due to environments (8.2%). Although the G x E interaction was significant (P<0.05), its contribution to the total variation was low, indicating that cassava genotypes were more closely related. The linear regression analysis indicated that the genotype TMS 81/01635 was more stable ( b=0.93, R2= 0.48 ) across environments. AMMI bi-plot revealed that genotypes Migyera and TMS 191/0057 and the group of environments ( E1=Namulonge season 1, E3=Bulisa season 1, and E5=Kapchorwa season 1) were less interactive in season 1 than in season 2 suggesting that environments of the first season were better than the second season. Migyera had the best yield and was more stable. The results further revealed that the genotype TMS I 91/0067 was very interactive and was more specifically adapted to Kapchorwa season 2 environment. |
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