Dollet Michel.
2003. Variation in plant trypanosomatids (Phytomonas spp.): epidemiological implications.
In : Solving problems in the real world : ICPP 2003, Book of Abstracts of Invited Papers 8th International Congress of Plant Pathology, 2-7 February 2003, Christchurch, New-Zealand. ISPP
Autre titre : Les variations des trypanosomes végétaux (Phytomonas spp.) : implications épidémiologiques
Résumé : Among plant trypanosomatids (Phytomonas), phloem-restricted isolates form a remarkable group because of their specific association with wilts of cultivated plants such as coconut, oil palm, coffee tree and Alpinia purpurata in Latin America and the Caribbean. The genus Phytomonas was proposed to classify trypanosomatids isolated from the latex tubes of some Euphorbiaceae. However, latex plants hosting trypanosomatids apparently do not suffer any pathological effect. This unique genus does not reflect the diversity of trypanosomatids, particularly in the light of the observation that several monoxenous genera of nebulous membership known as "insect trypanosomatids" can multiply in fruits and seeds. This hazy taxonomy is a problem for exchanges of information and for the search for natural reservoirs of the trypanosomatids that kill some cultivated plants. It is not known how to distinguish between those isolates that have an obligate dependency on specific plants and insect vectors (Hemiptera, Pentatomidae), and those isolates that are occasional residents in or on plants. Several molecular markers have been used to explore the diversity and variability of plant trypanosomatids. RAPD, SL RNA gene repeat sequences, kinetoplast DNA minicircle sequences and 18S and 5S rRNA sequences have revealed the substantial heterogeneity of these trypanosomatids, and the existence of at least eight groupings. The use of 5S rRNA sequences demonstrated that fruit isolates obtained from southern Spain were very similar to a latex isolate from Brazil. This sequence clearly is a valuable tool for molecular epidemiology of these infections. Recent developments on new markers, ribosomal ITS, confirm these data. (Texte intégral)
Mots-clés Agrovoc : Phytomonas, taxonomie, identification, marqueur génétique, variation génétique, biotype
Classification Agris : H20 - Maladies des plantes
Auteurs et affiliations
- Dollet Michel, CIRAD-EMVT-SANTE ANIMALE (FRA)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/523280/)
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