Abstract
The phenotypic and genetic differentiation between the two related Coffea species (C. liberica Hiern and C. canephora Pierre) was examined. These species differed markedly in terms of leaf, inflorescence, fruit and seed characters. A genetic map of the interspecific cross Coffea liberica × C. canephora was constructed on the basis of 72 BC1 hybrids. Eighty-three AFLP markers, four inter simple sequence repeats (ISSR) and five microsatellites corresponding to Coffea liberica species-specific markers were mapped into 16 linkage groups. The total length of the map was 1502.5 cM, with an average of 16.3 cM between markers and an estimated genome coverage of 81%. The two species were evaluated relative to 16 quantitative traits and found to be significantly different for 15 of them. Eight QTLs were detected, associated with variations in petiole length, leaf area, number of flowers per inflorescence, fruit shape, fruit disc diameter, seed shape and seed length. Results on segregation distortion and the under-representation of particular markers were interpreted in terms of genome differentiation. The implications for the introgression of QTLs involved in advantageous morphological traits (number of flowers per inflorescence, fruit and seed shape) are discussed.
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Acknowledgements
We wish to thank Dr. P. Hamon for her encouraging support, critical reading and valuable comments on an earlier version of the manuscript. This work was supported by the government of Côte d’Ivoire and IRD fellowships to A.N.
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Amidou, N., Michel, N., Serge, H. et al. Genetic basis of species differentiation between Coffea liberica Hiern and C. canephora Pierre: Analysis of an interspecific cross. Genet Resour Crop Evol 54, 1011–1021 (2007). https://doi.org/10.1007/s10722-006-9195-0
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DOI: https://doi.org/10.1007/s10722-006-9195-0


