African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

Genotype × environment interaction and yield stability of Arabica coffee (Coffea arabica L.) genotypes

Lemi Beksisa
  • Lemi Beksisa
  • Jimma Agricultural Research Center, P. O. Box, 192, Jimma, Ethiopia.
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Sentayew Alamerew
  • Sentayew Alamerew
  • College of Agriculture and Veterinary Medicine, Jimma University, P. O. Box, 370, Jimma, Ethiopia.
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Ashenafi Ayano
  • Ashenafi Ayano
  • Jimma Agricultural Research Center, P. O. Box, 192, Jimma, Ethiopia.
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Gerba Daba
  • Gerba Daba
  • College of Agriculture and Veterinary Medicine, Jimma University, P. O. Box, 370, Jimma, Ethiopia.
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  •  Received: 12 October 2017
  •  Accepted: 26 October 2017
  •  Published: 25 January 2018

Abstract

Lack of suitable varieties that exhibit stable yield performances across wide ranges of environments is the major factor among several production constraints contributing to low productivity of Arabica coffee in Ethiopia. Eleven advanced Limmu coffee genotypes were evaluated in eight environments (four locations over two years) to determine the existence of GEI and yield stability performances. The experiment was laid out in a randomized complete block design of two replications under all locations. Combined analysis of variance showed a highly significant effect of genotype by environment interaction indicating the differential yield response of genotypes across different environments. The major proportion of the variation explained by environments was 42.74% of the total variation. Nevertheless, the contribution of the genotypes to the total variance was much smaller than the environments, and the genotype by environment interaction. Different stability models such as additive main effect and multiplicative interaction (AMMI), AMMI stability value, cultivar superiority index and yield stability index were used for stability analysis. The first two Interaction Principal Component Axis (IPCAs) of AMMI exhibited a highly significant effect and cumulatively contributed about 63.21% of the total interaction sum of squares. Two high yielding genotypes, namely (L52/2001) and (L55/2001), on average, showed stable performance across environments. On the other hand, the study also illustrated the presence of location specific high yielding coffee genotype such as L56/2001. Regarding the test environments, Gera 2015/16 (E5) is considered as a more stable site over the rest environments, while Agaro 2015/16 (E7) was considered to be the most interactive environment. Based on the result of the study, coffee breeders or farmers would be recommended for wise selecting either for location specific or wider adaptable coffee genotypes leading to substantial yield increase under Limmu coffee growing areas.

 

Key words: Arabica coffee, environment, G x E interaction, stability.