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Lost and found: Coffea stenophylla and C. affinis, the forgotten coffee crop species of west Africa

Lost and found: Coffea stenophylla and C. affinis, the forgotten coffee crop species of west Africa

Davis, Aaron P., Gargiulo, Roberta, Fay, Michael, Sarmu, Daniel and Haggar, Jeremy ORCID: 0000-0002-4682-4879 (2020) Lost and found: Coffea stenophylla and C. affinis, the forgotten coffee crop species of west Africa. Frontiers in Plant Science, 11:616. ISSN 1664-462X (Online) (doi:https://doi.org/10.3389/fpls.2020.00616)

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Abstract

Two species, Coffea arabica and C. canephora, are used to produce the world’s coffee, and serve the coffee sector admirably. However, various challenges at the production (farm) level, including the increasing prevalence and severity of disease and pests and climate change, indicate that the coffee crop portfolio needs to be diversified in order to ensure resilience and sustainability. In this study we use a multidisciplinary approach (herbarium and literature review, fieldwork and DNA sequencing) to elucidate the taxonomic identities, agronomic attributes and whereabouts of two poorly known coffee crop species, C. affinis and C. stenophylla. We show that despite widespread, albeit small-scale, use as a coffee crop species across Upper West Africa, (and further afield) more than 100 years ago , these species are now rare in the wild and in cultivation. Fieldwork enabled us to rediscover C. stenophylla in Sierra Leone, which previously had not been recorded in the wild there since 1954. We confirm that C. stenophylla is an indigenous species in Guinea, Sierra Leone, and Ivory Coast, and show that C. affinis is indigenous in Guinea and Ivory Coast. Both species are likely to be threatened with extinction in the wild, particularly in Guinea. DNA sequencing using plastid and ITS markers was used to: confirm the identity of museum and field collected samples of C. stenophylla; demonstrate the use of plastid and nuclear markers to identify F1 and early-generation interspecific hybrids; identify the hybrid C. liberica x C. stenophylla; and reveal that C. liberica is non-monophyletic and likely to represent more than one species. Contrary to contemporary opinion, we could find no evidence of hybrid status for C. affinis, although the taxonomic identity of this species remains unclear. Sequencing analyses also show that hybridization is possible across all the major short-styled Africa Coffea species, i.e. Coffee Crop Wild Relative Priority Groups I and II. Coffea affinis and C. stenophylla may possess traits useful for coffee crop plant development, including taste differentiation, disease resistance, and climate resilience; these attributes would be best accessed via breeding programmes although these two species may have potential as crops with minimal domestication.

Item Type: Article
Uncontrolled Keywords: agronomy, climate change, coffee, west Africa, crop wild relatives (CWRs), DNA, Sierra Leone, speciality coffee
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Faculty of Engineering & Science > Natural Resources Institute > Ecosystem Services Research Group
Last Modified: 01 Jul 2020 09:53
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: REF 3
URI: http://gala.gre.ac.uk/id/eprint/28027

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