Publications des agents du Cirad


Specificity of phytopathogenic trypanosomes (Phytomonas spp.)

Dollet M., Ahmadegbe J.C., Gargani D., Marché S., Guerrini F., Segur C., Baltz T., Muller E.. 1993. In : International Congress of Plant Pathology. 6. s.l. : s.n.. International Congress of Plant Pathology. 6, 1993-07-28/1993-08-06, Montréal (Canada).

Phytomonas spp. do exist in plants. Different species of plants host Phytomonas, but significant pathogenicity has been observed in only four plants : coconut (Hartrot disease), oil palm (Marchitez disease), coffee (Phloem necrosis) and Alpinia purpurata (wilt). It is possible to differentiate Phytomonas specifically associated with this diseases from the others by several criteria. At the biological level : 1°) They are located in the sieve tubes, whereas others occur in latex tubes or in the fruits, 2°) Primoculture of pathogenic Phytomonas (Phloem restricted) can be obtained only with insect cell cultures. At the molecular level : 1°) Phloem restricted Phytomonas can be set apart by their schyzodeme, 2°) They harbor a double stranded RNA which could be of viral origin. Moreover, isolates of phloem restricted Phytomonas can be characterized by the size of the minicircles of kinetoplastic DNA, and their restriction endonucleases pattern.

Mots-clés : cocos nucifera; elaeis guineensis; coffea; alpinia purpurata; phytomonas

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