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Research Article |

Genetic Variability Analysis Among Quality Attributes of Arsi Coffee (Coffea arabica L.) Accessions at Mechara

Ethiopia is naturally endowed with a suitable climate for the production of high quality coffee. Arsi coffee is known to produce Harar C coffee quality grade and known for its unique flavor and aroma. Therefore, this study was conducted to estimate genetic divergence, heritability and genetic advance in Arsi coffee accession for bean quality traits. A total of 56 Arsi coffee accessions and four Hararghe coffee varieties were evaluated for bean physical and organoleptic coffee quality traits using Completely Randomized Design with three replications. The analysis of variance results showed significant variation among Arsi coffee accessions and Hararghe coffee varieties for all traits except astringency, bitterness and odor. The overall quality of Arsi coffee accession was in the range between 75.83 and 87.17% while the four Hararghe coffee varieties had 80.33 to 84% overall quality. Genotypic and phenotypic coefficient of variation ranged from 2.61 to 34.83% and 2.97 to 35.67%, respectively. The heritability in broad sense and genetic advance as percent of mean ranged from 32.50% to 99.88% and 3.94 to 70.15%, respectively. Most of the coffee quality traits had high heritability except aromatic intensity had low heritability. Based on un-weighted pair group method of classification the 60 genotypes were grouped into 14 clusters of which Cluster I was the largest consisted of 26 (43.33%) collections while other clusters consisted of 1 to 8 genotypes. Principal components (PCs) showed that the first three PC explained 89 % of the total variance of which PC1, PC2 and PC3 contributed 56, 26 and 7 %, respectively. The highest contribution of PC1 to total variance was due to the high contribution of organoleptic quality traits; aromatic intensity, aromatic quality, acidity, flavor, overall standard and overall cup quality. The Euclidean distances of 1770 pair of genotypes ranged from 2.0 to 12.06 with 6.79, 1.51 and 22.2% overall mean standard deviation and coefficient of variation, respectively. The Arsi coffee collections with high mean values for varied number of coffee beans physical and organoleptic quality traits distributed across clusters. Some clusters consisted of collections with high mean values for most of the coffee quality traits including for overall coffee quality. The research results suggested the higher chance of selection of genotypes to be developed as varieties for high coffee quality and for crossing of distant collections with distinct quality traits to produce hybrids with high coffee quality.

Cluster, Cup Quality, Euclidian Distance, Genetic Variability, Principal Component

APA Style

Girma, S., Mohammed, W., Ayano, A. (2023). Genetic Variability Analysis Among Quality Attributes of Arsi Coffee (Coffea arabica L.) Accessions at Mechara. American Journal of BioScience, 11(6), 150-158.

ACS Style

Girma, S.; Mohammed, W.; Ayano, A. Genetic Variability Analysis Among Quality Attributes of Arsi Coffee (Coffea arabica L.) Accessions at Mechara. Am. J. BioScience 2023, 11(6), 150-158. doi: 10.11648/j.ajbio.20231106.13

AMA Style

Girma S, Mohammed W, Ayano A. Genetic Variability Analysis Among Quality Attributes of Arsi Coffee (Coffea arabica L.) Accessions at Mechara. Am J BioScience. 2023;11(6):150-158. doi: 10.11648/j.ajbio.20231106.13

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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