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Diversity of the cassiicolin gene in Corynespora cassiicola and relation with the pathogenicity in Heyea brasiliensis
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Fungal Biol. ISI Document Delivery No.: 300WE Times Cited: 0 Cited Reference Count: 45 Cited References: Andrie RA, 2007, PHYTOPATHOLOGY, V97, P694, DOI 10.1094/PHYTO-97-6-0694 Atan S, 2003, J RUBBER RES, V6, P58 Barthe P, 2007, J MOL BIOL, V367, P89, DOI 10.1016/j.jmb.2006.11.086 Bendtsen JD, 2004, J MOL BIOL, V340, P783, DOI 10.1016/j.jmb.2004.05.028 Breton F., 2000, Journal of Rubber Research, V3, P115 Cai L, 2006, ANTON LEEUW INT J G, V89, P293, DOI 10.1007/s10482-005-9030-1 Carbone I, 1999, MYCOLOGIA, V91, P553, DOI 10.2307/3761358 Chee K. 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Seguin, Marc Leroy, Thierry Roeckel-Drevet, Patricia Pujade-Renaud, Valerie IFC (Institut Francais du Caoutchouc, Paris, France); Michelin (Clermont-Ferrand, France); SIPH ('Societe Internationale de Plantations d'Heveas', Courbevoie, France); SOCFIN ('Societe Financiere des Caoutchoucs', Bruxelles, Belgium) This work was supported in part by a grant from the IFC (Institut Francais du Caoutchouc, Paris, France) and the companies Michelin (Clermont-Ferrand, France), SIPH ('Societe Internationale de Plantations d'Heveas', Courbevoie, France) and SOCFIN ('Societe Financiere des Caoutchoucs', Bruxelles, Belgium). We thank Gerald Oliver and Stephanie Massey for maintenance of rubber trees in the greenhouse. Elsevier sci ltd Oxford. Corynespora cassiicola is an important plant pathogenic Ascomycete causing the damaging. Corynespora Leaf Fall (CLF) disease in rubber tree (Hama 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. (C) 2013 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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