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Diversity of the cassiicolin gene in Corynespora cassiicola and relation with the pathogenicity in Hevea brasiliensis

Déon Marine, Fumanal Boris, Gimenez Stéphanie, Bieysse Daniel, Oliveira Ricardo R., Shuib Siti Shuhada, Breton Frédéric, Elumalai Sunderasan, Vida João B., Seguin Marc, Leroy Thierry, Roeckel-Drevet Patricia, Pujade-Renaud Valérie. 2014. Diversity of the cassiicolin gene in Corynespora cassiicola and relation with the pathogenicity in Hevea brasiliensis. Fungal Biology, 118 (1) : pp. 32-47.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : MYCOLOGY

Abstract : Corynespora cassiicola is an important plant pathogenic Ascomycete causing the damaging Corynespora Leaf Fall (CLF) disease in rubber tree (Hevea brasiliensis). A small secreted glycoprotein named cassiicolin was previously described as an important effector of C. cassiicola. In this study, the diversity of the cassiicolin-encoding gene was analysed in C. cassiicola isolates sampled from various hosts and geographical origins. A cassiicolin gene was detected in 47 % of the isolates, encoding up to six distinct protein isoforms. In three isolates, two gene variants encoding cassiicolin isoforms Cas2 and Cas6 were found in the same isolate. A phylogenetic tree based on four combined loci and elucidating the diversity of the whole collection was strongly structured by the toxin class, as defined by the cassiicolin isoform. The isolates carrying the Cas1 gene (toxin class Cas1), all grouped in the same highly supported clade, were found the most aggressive on two rubber tree cultivars. Some isolates in which no Cas gene was detected could nevertheless generate moderate symptoms, suggesting the existence of other yet uncharacterized effectors. This study provides a useful base for future studies of C. cassiicola population biology and epidemiological surveys in various host plants. (Résumé d'auteur)

Mots-clés Agrovoc : Hevea brasiliensis

Mots-clés géographiques Agrovoc : Malaisie, Brésil

Classification Agris : H20 - Plant diseases
F30 - Plant genetics and breeding

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

Auteurs et affiliations

  • Déon Marine, Université Blaise Pascal (FRA)
  • Fumanal Boris, Université Blaise Pascal (FRA)
  • Gimenez Stéphanie
  • Bieysse Daniel, CIRAD-BIOS-UMR BGPI (FRA)
  • Oliveira Ricardo R., UEM (BRA)
  • Shuib Siti Shuhada, RRIM (MYS)
  • Breton Frédéric, CIRAD-BIOS-UMR AGAP (FRA)
  • Elumalai Sunderasan, RRIM (MYS)
  • Vida João B., UEM (BRA)
  • Seguin Marc, CIRAD-BIOS-UMR AGAP (FRA)
  • Leroy Thierry, CIRAD-BIOS-UMR AGAP (FRA)
  • Roeckel-Drevet Patricia, Université Blaise Pascal (FRA)
  • Pujade-Renaud Valérie, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/572402/)

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