Understanding the genetic blueprint of Coffea arabica to develop climate-resilient, disease-resistant, and high-quality varieties through marker-assisted breeding and conservation of wild genetic resources.
Coffea arabica is an allotetraploid (2n = 4x = 44) derived from hybridization between C. canephora and C. eugenioides.
Schematic representation of coffee chromosomes (11 pairs, each from two subgenomes)
| Feature | Value |
|---|---|
| Genome size | 710 Mb |
| Number of genes | ~45,000 |
| Subgenome 1 (C. canephora-derived) | ~22,500 genes |
| Subgenome 2 (C. eugenioides-derived) | ~22,500 genes |
| Repeat content | 52% |
| Genes involved in caffeine biosynthesis | 23 |
Ethiopia is the center of origin and diversity for Coffea arabica, containing approximately 70% of the world's genetic diversity.
| Marker Type | Number Available | Applications | Key Traits |
|---|---|---|---|
| SSR (Simple Sequence Repeats) | 500+ | Genetic diversity, fingerprinting | Variety identification |
| SNP (Single Nucleotide Polymorphisms) | 70,000+ | GWAS, genomic selection | Yield, quality, resistance |
| DArT Markers | 15,000+ | Population structure | Diversity analysis |
| CBD Resistance Markers | 12 | Marker-assisted selection | Coffee Berry Disease resistance |
| CLR Resistance Markers | 8 | Marker-assisted selection | Coffee Leaf Rust resistance |
Ethiopia's diverse coffee varieties, including landraces, regional selections, and improved varieties developed through breeding programs.
Selected from Metu Bishari forest population. Widely planted in Ethiopia for its disease resistance and productivity.
View genetic profile →Sister line to 74110 with larger bean size, selected from the same Metu Bishari population.
View genetic profile →Selected for exceptional cup quality while maintaining CBD resistance from the Metu Bishari population.
View genetic profile →High-yielding selection with good adaptation to varying moisture conditions.
View genetic profile →One of the highest-yielding CBD-resistant varieties, combining productivity with good bean size.
View genetic profile →Diverse heirloom varieties from Yirgacheffe region, known for exceptional floral and citrus characteristics.
View genetic profile →Traditional varieties from Sidama with distinctive berry and wine-like flavor profiles.
View genetic profile →Original Ethiopian landrace that became world-famous for its unique floral and tea-like characteristics.
View genetic profile →Molecular markers and breeding programs for resistance to major coffee diseases
Caused by: Colletotrichum kahawae
Major problem in: Africa (especially Ethiopia, Kenya)
Resistance genes identified: Ck-1, Ck-2
Markers available: SSRs linked to CBD resistance from the Timor Hybrid and Ethiopian landraces
Caused by: Hemileia vastatrix
Major problem in: All coffee-growing regions globally
Resistance genes: SH1-SH9 (SH3 most important in Arabica)
Markers available: Molecular markers for SH genes from Timor Hybrid derivatives
Caused by: Meloidogyne spp.
Major problem in: Central and South America
Resistance genes: Mex-1 (from Coffea canephora)
Traits under selection: Drought tolerance, heat tolerance, temperature range adaptation
Wild relatives with resilience genes: C. canephora, C. liberica, C. racemosa
Preserving coffee genetic diversity through in-situ and ex-situ conservation programs
| Collection | Accessions |
|---|---|
| CATIE (Costa Rica) | 1,900+ Arabica accessions |
| Jimma Agricultural Research Center (Ethiopia) | 4,000+ accessions |
| IRD (France/Reunion) | 8,000+ accessions |
| IAC (Brazil) | 3,000+ accessions |
| World Coffee Research (Global) | Multi-site conservation network |
Access coffee genomic resources, bioinformatics tools, and genetic databases
Comprehensive documentation of Ethiopian coffee diversity, including wild populations, landraces, and improved varieties.
Open-access coffee genomics platform
FAO-supported collection missions gather thousands of coffee accessions from Ethiopian forests. Establishment of Jimma Agricultural Research Center as the national coffee research hub.
Release of first CBD-resistant varieties (74110, 74112, 74140, 74148, 74158) selected from Metu Bishari forest population following devastating CBD outbreaks.
Multi-location trials across coffee-growing regions to identify best-adapted varieties for different agro-ecologies.
Introduction of molecular markers (SSRs, AFLPs) for diversity analysis and fingerprinting of Ethiopian coffee collections.
Completion of C. canephora genome (2014) and C. arabica genome (2017). Large-scale SNP discovery in Ethiopian germplasm.
Implementation of genomic selection for complex traits, climate resilience breeding, and participatory variety selection with farmers.
Collaborating with national and international partners to advance coffee genetics
Ethiopia's national coffee research
Global variety trials
International germplasm collection
Coffee genomics research
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