Summary
The interspecific (C. arabica × tetraploid C. canephora) F1 hybrid showed a low but highly variable fertility. An almost complete restoration to normal fertility was observed in individual trees of BC1 and BC2 generations with C. arabica as recurrent parent. From a comparison of various tests of fertility, it was found that pollen viability is a satisfactory measure of fertility.
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Owuor, J.B.O., Van Der Vossen, H.A.M. Interspecific hybridization between Coffea arabica L. and tetraploid C. canephora P. ex Fr. I. Fertility in F1 hybrids and backcrosses to C. Arabica . Euphytica 30, 861–866 (1981). https://doi.org/10.1007/BF00038816
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DOI: https://doi.org/10.1007/BF00038816