Review of Coconut "Lethal yellowing" type diseases: diversity, variability and diagnosis

Dollet Michel, Quaicoe Robert N., Pilet Fabian. 2009. Review of Coconut "Lethal yellowing" type diseases: diversity, variability and diagnosis. OCL. Oléagineux Corps gras Lipides, 16 (2) : 97-101.

Résumé : Coconut palms (Cocos nucifera L.) can be affected by several types of Lethal Yellowing (LY) diseases worldwide. Some of the syndromes are caused by phytoplasmas, small bacteria that are impossible to detect by light microscopy. Amplification of a given gene of the phytoplasmas by polymerase chain reaction (PCR) is the most convenient diagnosis method. The problem is that there are at least 28 "groups" of phytoplasmas and only one pair of primers -P1/P7- commonly used for PCR. As these primers belong to a very conserved gene, false positives are frequent. Consequently, alternative primers specific to one "strain" (or subgroup) have to be used, such as LY-F/LY-R for the Caribbean LY, Rohde primers for LD Tanzania. Such specific primers are sometimes restrictive. Indeed, there is variability within each strain and the sequence of the primers has to be adapted to that variability. There are at least five LY subgroups. The subgroups can only be identified by restriction fragment length polymorphism or sequencing. In Africa, two subgroups of LY phytoplasmas have been identified so far.

Mots-clés Agrovoc : Cocos nucifera, maladie bactérienne, phytoplasme

Mots-clés géographiques Agrovoc : Mozambique, République-Unie de Tanzanie, Ghana

Mots-clés complémentaires : Jaunissement mortel

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Dollet Michel, CIRAD-BIOS-UPR Etiologie dépérissements (FRA)
• Quaicoe Robert N., OPRI (GHA)
• Pilet Fabian, CIRAD-BIOS-UPR Etiologie dépérissements (FRA) ORCID: 0000-0003-0079-216X

Source : Cirad - Agritrop (https://agritrop.cirad.fr/550756/)

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