Greener Journal of Plant Breeding and Crop Science Vol. 2 (2), pp. 018-026, March 2014.
ISSN: 2354-2292 © 2013 Greener Journals
Manuscript Number: 101013897
Stability Analysis of Bean Yields of Arabica Coffee Genotypes across Different Environments
Yonas Belete*1, Bayetta Belachew2, Chemeda Fininsa3
1Plant Breeder, Jimma Agricultural Research Center, P.O. Box, 192, Jimma, Ethiopia.
2Plant Breeder, Inter Africa Coffee Organization (IACO) Research Director.
3Plant Pathologist, Associate Professor, Haramaya University, P.O. Box 138, Dire Dawa, Ethiopia.
An evaluation of stability of thirty Arabica coffee genotypes was carried out across different environments. The interaction of genotype by environment (G x E) across the different environments was highly significant. Both heterogeneity of regression and pooled deviation mean square from regression were highly significant. On this basis stability analysis was done using regression and AMMI models. On the basis of the analyses, different sets of genotypes were found as stable by the two models. Genotypes 7803A and 7803B, which were at the 13th and 14th ranks from thirty genotypes, were found as stable by the regression model. On the other hand genotypes 8143, 75187B and 8019, which were at the second, third and seventh ranks, were found as stable by the AMMI model. The discrepancy noticed in the two models in indicating the stable genotypes was largely attributed to their differences in accounting the interaction sum of squares. The result of the study is considered as one remarkable success in the history of Arabica coffee research as identifying stable genotype for multi-locations / diverse environments has long been a major challenge and in practice able for decades.
Keywords: Stable, Genotype, Arabica coffee, Environments.