Evaluation of field resistance to Microcyclus ulei of a collection of Amazonian rubber tree (Hevea brasiliensis) germplasm

Le Guen Vincent, Garcia Dominique, Mattos Carlos Raimunto Reis, Clément-Demange André. 2002. Evaluation of field resistance to Microcyclus ulei of a collection of Amazonian rubber tree (Hevea brasiliensis) germplasm. Crop Breeding and Applied Biotechnology, 2 (1) : 141-148.

Autre titre : Evaluation de la résistance au champ à Microcyclus ulei d'une collection de matériel génétique d'hévéa (Hevea brasiliensis) amazonien

Résumé : South American Leaf Blight (SALB) field resistance to the fungus Microcyclus ulei (P. Henn.) v. Arx was observed on an ex-situ germplasm collection of rubber trees [Hevea brasiliensis (Willd. ex Adr. De Juss.) Muell.-Arg.], planted both in French Guyana and in Brazil, wich included 298 accessions from a survey in the Brazilian states of Acre, Mato Grosso and Rondônia. Two sets of observations were made in French Guyana, in early 1999 and Iate 2000, but only one set was made in Brazil in early 1999. Results showed a high ratio of SALB-susceptible clones among Mato Grosso origins (up to 81%), whereas clones from Acre or Rondônia were the most resistant . The resistance of the Mato Grosso clones seems to be more unstable than that found in of the Acre or Rondônia clones. This result is consistent with the data reported on genetic diversity of H. brasiliensis, and can explain the lack of resistance to M. ulei found in the Asiatic clones.

Mots-clés Agrovoc : Hevea brasiliensis, résistance aux maladies, Microcyclus ulei, essai de variété, clone

Mots-clés géographiques Agrovoc : Guyane française, Brésil, Acre (Brésil), Mato Grosso, France

Mots-clés géographiques complémentaires : Rondonia

Classification Agris : F30 - Génétique et amélioration des plantes
H20 - Maladies des plantes

Auteurs et affiliations

• Le Guen Vincent, CIRAD-CP-HEVEA (GUF)
• Garcia Dominique, CIRAD-CP-HEVEA (BRA)
• Mattos Carlos Raimunto Reis, Michelin Brésil (BRA)
• Clément-Demange André, CIRAD-CP-HEVEA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/523047/)

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