Journal
PLANT PATHOLOGY
Volume 67, Issue 6, Pages 1416-1425Publisher
WILEY
DOI: 10.1111/ppa.12849
Keywords
Capsicum spp; Cucumber mosaic virus; Cucumovirus; pepper; Pepper veinal mottle virus; Potyvirus
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Funding
- ECOWAS (Economic Community of West African States) through the PACER programme
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The prevalence of viruses in pepper crops grown in open fields in the different agro-ecological zones (AEZs) of Cote d'Ivoire was surveyed. Pepper veinal mottle virus (PVMV; genus Potyvirus) and Cucumber mosaic virus (CMV; genus Cucumovirus) were the most frequent viruses among those surveyed, while tobamoviruses (genus Tobamovirus) were detected at low frequency. PVMV showed a high heterogeneity across AEZs, which may be related to climatic, ecological or agronomical conditions, whereas CMV was more homogeneously distributed. The molecular diversity of CMV and PVMV were analysed from partial genome sequences. Despite the low number of CMV isolates characterized, two molecular groups were revealed, one corresponding to subgroup IA and the other to reassortants between subgroups IA and IB. RNAs 1 and 3 of the reassortants clustered with the IB subgroup of CMV isolates, whereas their RNA 2 clustered with the IA subgroup. Importantly, RNA 1 of CMV isolates of the IB subgroup has been shown to be responsible for adaptation to pepper resistance. The diversity of PVMV in the VPg- and coat protein-coding regions revealed multiple clades. The central part of the VPg showed a high level of amino acid diversity and evidence of positive selection, which may be a signature of adaptation to plant recessive resistance. As a consequence, for efficient deployment of resistant pepper cultivars, it would be desirable to examine the occurrence of virulent isolates in the CMV or PVMV populations in Cote d'Ivoire and to follow their evolution as the resistance becomes more widely deployed.
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