Regulatory considerations surrounding the deployment of Bt-expressing cowpea in Africa: report of the deliberations of an expert panel.

Joseph Huesing, Jörg Romeis, Norman Ellstrand, Alan Raybould, Richard Hellmich, Jeff Wolt, Jeff Ehlers, Clémentine Dabiré, Christian Fatokun, Karen Hokanson, Mohammad F. Ishiyaku, Venu Margam, Nompumelelo Obokoh, Jacob Mignouna, Francis Nangayo, Jeremy Ouedraogo, Rémy Pasquet, Barry Pittendrigh, Barbara Schaal, Jeff SteinManuele Tamò, Larry Murdock

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Cowpea (Vigna unguiculata spp unguiculata) is adapted to the drier agro-ecological zones of West Africa where it is a major source of dietary protein and widely used as a fodder crop. Improving the productivity of cowpea can enhance food availability and security in West Africa. Insect predation--predominately from the legume pod borer (Maruca vitrata), flower thrips (Megalurothrips sjostedti) and a complex of pod-sucking bugs (e.g., Clavigralla spp)--is a major yield-limiting factor in West African cowpea production. Dramatic increases in yield are shown when M. vitrata is controlled with insecticides. However, availability, costs, and safety considerations limit pesticides as a viable option for boosting cowpea production. Development of Bt-cowpea through genetic modification (GM) to control the legume pod borer is a promising approach to cowpea improvement. Cowpea expressing the lepidopteran-active Cry1Ab protein from Bacillus thuringiensis is being developed as a first generation Bt-cowpea crop for West Africa. Appropriate stewardship of Bt-cowpea to assure its sustainability under West African conditions is critical to its successful development. A first step in this process is an environmental risk assessment to determine the likelihood and magnitude of adverse effects of the Cry1Ab protein on key environmental protection goals in West Africa. Here we describe the results of an expert panel convened in 2009 to develop the problem formulation phase for Bt-cowpea and to address specific issues around gene flow, non-target arthropods, and insect resistance management.

Original languageEnglish (US)
Pages (from-to)211-224
Number of pages14
JournalGM crops
Volume2
Issue number3
DOIs
StatePublished - 2011

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