Infection Biology of Moniliophthora perniciosa on Theobroma cacao and Alternate Solanaceous Hosts

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dc.contributor.authorJean-Philippe Marelli
dc.contributor.authorSiela N. Maximova
dc.contributor.authorKarina P. Gramacho
dc.contributor.authorSeogchan Rang
dc.contributor.authorMark John Guiltinan
dc.date.accessioned2014-05-05T11:10:24Z
dc.date.available2014-05-05T11:10:24Z
dc.date.issued2009
dc.description.abstractThe C-biotype of Moniliophthora perniciosa is the causal agent of witches' broom disease of Theobroma cacao L. While this disease is of major economic importance, the pathogenicity mechanisms and plant responses underlying the disease are difficult to study given the cacao tree's long life cycle and the limited availability of genetic and genomic resources for this system. The S-biotype of M perniciosa infects solanaceous hosts, particularly pepper (Capsicum annuum) and tomato (Solarium lycopersicum). These species are much more amenable for performing studies of mechanisms underpinning host-pathogen interactions as compared to cacao. A phylogenetic analysis performed in this study demonstrated that S-biotype strains clustered with C-biotype strains, indicating that these bio-types are not genetically distinct. A comparative analysis demonstrated that disease progression in tomato infected with the S- biotype is similar to that described for cacao infected with the C- biotype. The major symptoms observed in both systems are swelling of the infected shoots and activation and proliferation of axillary meristems. Cellular changes observed in infected tissues correspond to an increase in cell size and numbers of xylem vessels and phloem parenchyma along the infected stem. Observations revealed that fungal colonization is biotrophic during the first phase of infection, with appearance of calcium oxalate crystals in close association with hyphal growth. In summary, despite different host specificity, both biotypes of M. perniciosa exhibit similar disease-related characteristics, indicating a degree of conservation of pathogenicity mechanisms between the two biotypes.en_US
dc.identifier.citationTropical Plant Biol. (2009) 2:149-160en_US
dc.identifier.urihttp://hdl.handle.net/123456789/960
dc.language.isoenen_US
dc.subjectMoniliophthora perniciosaen_US
dc.subjectTheobroma cacao L.en_US
dc.subjectSolarium iycopersicumen_US
dc.subjectCapsicum annuumen_US
dc.subjectFungal pathogenicityen_US
dc.subjectPlant defenseen_US
dc.titleInfection Biology of Moniliophthora perniciosa on Theobroma cacao and Alternate Solanaceous Hostsen_US
dc.typeArticleen_US

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