"Candidatus Phytoplasma palmicola", associated with a lethal yellowing-type disease of coconut (Cocos nucifera L.) in Mozambique

Harrison Nigel, Davis Robert E., Oropeza Carlos, Helmick Ericka E., Narvaez Maria, Eden-Green Simon, Dollet Michel, Dickinson Mathhew. 2014. "Candidatus Phytoplasma palmicola", associated with a lethal yellowing-type disease of coconut (Cocos nucifera L.) in Mozambique. International Journal of Systematic and Evolutionary Microbiology, 64 (6) : 1890-1899.

https://doi.org/10.1099/ijs.0.060053-0

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Quartile : Q3, Sujet : MICROBIOLOGY

Résumé : In this study, the taxonomic position and group classification of the phytoplasma associated with a lethal yellowing-type disease (LYD) of coconut (Cocos nucifera L.) in Mozambique were addressed. Pairwise similarity values based on alignment of nearly full-length 16S rRNA gene sequences (1530 bp) revealed that the Mozambique coconut phytoplasma (LYDM) shared 100% identity with a comparable sequence derived from a phytoplasma strain (LDN) responsible for Awka wilt disease of coconut in Nigeria, and shared 99.0-99.6% identity with 16S rRNA gene sequences from strains associated with Cape St Paul wilt (CSPW) disease of coconut in Ghana and Côte d'Ivoire. Similarity scores further determined that the 16S rRNA gene of the LYDM phytoplasma shared ,97.5% sequence identity with all previously described members of 'Candidatus Phytoplasma'. The presence of unique regions in the 16S rRNA gene sequence distinguished the LYDM phytoplasma from all currently described members of 'Candidatus Phytoplasma', justifying its recognition as the reference strain of a novel taxon, 'Candidatus Phytoplasma palmicola'. Virtual RFLP profiles of the F2n/R2 portion (1251 bp) of the 16S rRNA gene and pattern similarity coefficients delineated coconut LYDM phytoplasma strains from Mozambique as novel members of established group 16SrXXII, subgroup A (16SrXXII-A). Similarity coefficients of 0.97 were obtained for comparisons between subgroup 16SrXXII-A strains and CSPW phytoplasmas from Ghana and Côte d'Ivoire. On this basis, the CSPW phytoplasma strains were designated members of a novel subgroup, 16SrXXII-B.

Mots-clés Agrovoc : Cocos nucifera, maladie bactérienne, flétrissement, phytoplasme, taxonomie, classification, identification, phylogénie, génétique moléculaire

Mots-clés géographiques Agrovoc : Mozambique, Côte d'Ivoire, Nigéria, Ghana

Mots-clés complémentaires : Candidatus phytoplasma palmicola, Maladie du jaunissement mortel, Maladie du flétrissement

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

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