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Abstract                 Volume:9  Issue-3  Year-2021          Original Research Articles


Online ISSN : 2347 - 3215
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcret@gmail.com

Relationship of Coffee Wilt Disease (Gibberella xylarioides Heim and Saccas) Resistance and Morphological Traits in Selected Arabica Coffee (Coffea arabica L.) Genotypes
Admikew Getaneh*
Department of Coffee Breeding and Genetics at Jimma Agricultural Research Center, Ethiopian Institute of Agricultural Research, Jimmy
*Corresponding author
Abstract:

Understanding the association between coffee wilt disease (CWD) resistance and morphological traits are important in designing appropriate resistant breeding approaches. The study was conducted to estimate the relationship among characters and to determine path coefficient analysis (direct and indirect effects) of the characters on resistance in 17 selected genotypes (experiment 1); and eight parents with 28 F1 crosses (experiment 2) using randomized complete block design (RCBD) with three replications in artificial seedling inoculation test at the greenhouse, Jimma Agricultural Research Center (JARC). The analyses of variance showed that highly significant differences (p<0.01) among the genotypes for wilted seedling percentage, incubation period, number of defoliated leaves, and all seedling growth characters (height, stem diameter, average inter-node length, petiole length, leaf area, number of nodes and leaves) for both experiments. Wilted seedling percentage revealed a highly significant negative genotypic correlation with the incubation period, leaf area, and stem diameter in both experiments; while it showed a positive association with the number of defoliated leaves. The incubation period, leaf area, and stem diameter observed high negative direct effects on CWD resistance. Additionally, seedling height also showed a direct negative effect, but low in magnitude. The indirect effect of average internodes length found mainly through leaf area, and seedling height through incubation period and stem diameter. We concluded that emphasis should be given to the incubation period and stem diameter along with the number of defoliated leaves for the indirect selection of resistance Arabica coffee genotypes. These traits could be used as a selection criterion to improve resistance in Arabica coffee; however, it is not the only factors that contributes to selection. Therefore, further study is important on the association of CWD resistance to these morphological and vascular discoloration traits atnatural field conditions (multi-locations).

Keywords: Arabica coffee, coffee wilt disease, correlation, path coefficient analysis, resistance
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How to cite this article:

Admikew Getaneh. 2021. Relationship of Coffee Wilt Disease (Gibberella xylarioides Heim and Saccas) Resistance and Morphological Traits in Selected Arabica Coffee (Coffea arabica L.) Genotypes.Int.J.Curr.Res.Aca.Rev. 9(3): 97-110
doi: https://doi.org/10.20546/ijcrar.2021.903.010