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Published on March 10, 2006; 10.1104/pp.105.074542

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Received November 23, 2005
Returned for revision December 22, 2005
Accepted February 16, 2006

Xanthan Induces Plant Susceptibility by Suppressing Callose Deposition

Maximina H. Yun , Pablo S Torres , Mohamed El Oirdi , Luciano A. Rigano , Rocio Gonzalez-Lamothe , María Rosa Marano , Atilio P Castagnaro , Marcelo A. Dankert , Kamal Bouarab *, and Adrián A. Vojnov

Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas and Facultad de Ciencias Exactas y Naturales-Universidad de Buenos Aires, Buenos Aires, Av. Patricias Argentinas 435, C1405BWE, Ciudad de Buenos Aires, Argentina
Centre SÈVE, Centre de Recherche sur les Mécanismes du Fonctionnement Cellulaire, Département de Biologie, Facultés des Sciences, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, Québec, J1K2R1, Canada
Department of Biochemistry, Université de Montréal, Montréal, Québec H3C 3J7, Canada
IBR- Depto. Microbiología. Facultad de Ciencias. Bioquímicas y Farmacéuticas. U.N.R. Suipacha 531, S2002LRK, Rosario, Argentina
Estación Experimental Agroindustrial Obispo Colombres, Av. William Cross 3150, Las Talitas, 4101-Tucumán, Argentina

* Corresponding author; email: Kamal.Bouarab{at}USherbrooke.ca.

Xanthan is the major exopolysaccharide secreted by Xanthomonas ssp. Despite its diverse roles in bacterial pathogenesis of plants little is known about the real implication of this molecule in Xanthomonas pathogenesis. In the present study we show that in contrast to Xanthomonas campestris pv. campestris strain 8004 (wild type), the xanthan minus mutant (strain 8397) and the mutant strain 8396, which is producing truncated xanthan, fail to cause disease in both Nicotiana benthamiana and Arabidopsis thaliana plants. In contrast to wild type, 8397 and 8396 strains induce callose deposition in Nicotiana benthamiana and Arabidopsis thaliana plants. Interestingly, treatment with xanthan but not truncated xanthan, suppresses the accumulation of callose and enhance the susceptibility of both Nicotiana benthamiana and Arabidopsis thaliana plants to 8397 and 8396 mutant strains. Finally, in concordance, we also show that treatment with an inhibitor of callose deposition previous to infection induces susceptibility to 8397 and 8396 strains. Thus, Xanthan suppression effect on callose deposition seems to be important for Xanthomonas infectivity.




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