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Doubled haploids of Coffea canephora: development, fertility and agronomic characteristics

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Doubled haploids (DH) of Coffea canephora Pierre were developed using haploid embryos which occur spontaneously in association with polyembryony. The frequencies of polyembryonic seeds and haploid embryos varied according to the parental genotypes. However, production of a large number of DH seemed possible from all genotypes. More than 750 DHs produced from various genotypes were grown under field conditions and evaluated for different characters of agronomic importance. Approximately half of DH genotypes did not survive, suggesting a strong, negative effect of homozygosity. Inbreeding depression is particularly severe on general vigor and reproductive aspects. For several characters studied such as leaf shape, leaf rust resistance and hundred bean weight, considerable genetic variations were observed within and between groups of DHs constituted by the DHs produced from the same clone. Despite their low vigor and reduced fertility, the DHs of C. canephora offer new possibilities in genetic research and coffee breeding.

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Lashermes, P., Couturon, E. & Charrier, A. Doubled haploids of Coffea canephora: development, fertility and agronomic characteristics. Euphytica 74, 149–157 (1993).

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