Greener Journal of Agronomy, Forestry and Horticulture Vol. 3 (1), pp. 001-010, January 2015.
ISSN: 2354-2306 © 2015 Greener Journals
Manuscript Number: 061614271
Genetic Variation and Extent of Heritability of the Various Agronomic Traits of Arabica Coffee (Coffea Arabica L.) Genotypes Grown across different Environments in Ethiopia
Yonas Belete*1 and Tarekegn Argaw2
1 Plant Breeder, Jimma Agricultural Research Center, P.O. Box, 192, Jimma, Ethiopia.
2 Biometrician, Jimma Agricultural Research Center, P.O. Box, 192, Jimma, Ethiopia.
*Corresponding Author’s Email: yonasbelete85 @yahoo. com
The genetic variation and heritability estimates of various agronomic traits of Arabica coffee genotypes were evaluated from trials carried out at multi-locations. The mean differences among genotypes and genotype by environment interactions for the various agronomic traits: yield, coffee berry disease (CBD), Coffee leaf rust (CLR) severity, cherry weight, hundred beans weight (HBW), outturn, bean length, bean width, parchment length, floated beans percent, plant height, stem girth, number of primary branches (NPB), internode length and canopy diameter of arabica coffee were highly significant (p<0.01). On this basis, the heritability estimates of those traits which have much to do with bean quality and morphological characters (which have much to do with plant population per unit area that determines productivity) exhibited higher heritability values that ranged from 52.42 to 73.17 %. This indicates that the different coffee types in Ethiopia shows high genetic variations for these traits and therefore, bean quality and productivity can be improved. On the other hand, heritability of yield, resistances to coffee berry disease and leaf rust diseases were below 26.19 % showing that the earlier selection practiced during the preliminary evaluation at Gerato advanced the desirable types for these traits and reduced their variability to have a negative effect on their heritability estimates in this particular study, but, this does not indicate that there is less hope in improving them for economic use because random samples from a parent population has wide variability for the stated traits in Ethiopia.
Key words: Agronomic Traits, Arabica Coffee, Heritability, Genetic Variation.
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