| Abstract Detail
Plant Protection Charkowski, Amy [1]. Genomic and Biological Comparisons of Soft Rot Bacterial Pathogens. PECTOBACTERIUM (formerly Erwinia carotovora) and Dickeya (formerly Erwinia chrysanthemi) species are related broad host range enterobacterial pathogens that infect plants in at least 50% of angiosperm plant orders. They are important pathogens of solanaceous plants, including potato, tomato, pepper, and tobacco. Multilocus sequence analysis of these genera demonstrated that Dickeya is more diverse than Pectobacterium and that the Pectobacterium strains are divided into five clades, three of which contain isolates from potatoes. A comparison of the genome sequence and phenotypes of Pectobacterium and Dickeya shows that although both genera are soft rot enterobacterial pathogens, they differ in the methods used to attack their host plants. Ecological studies of Pectobacterium strains show that multiple strains from multiple clades are generally present in a field with plants affected by soft rot or blackleg symptoms. These strains differ in the virulence genes they encode, with some strains lacking, for example, the type III secretion system (T3SS) or proteases. Examination of hundreds of colonies isolated from diseased plants with a non-pectate based medium showed that none of the Pectobacterium isolates lacked pectate lyases or polygalacturonases. Thus, these plant cell wall degrading enzymes appear to be more important for survival of Pectobacterium than the T3SS or proteases.
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1 - University of Wisconsin-Madison, Department of Plant Pathology, 1630 Linden Drive, Madison, WI, 53706, USA
Keywords:
soft rot Erwinia
blackleg.
Session: PAA03-3
Location: Hall of Ideas Room E/Monona Terrace
Date: Thursday, July 27th, 2006
Time: 9:00 AM
Abstract ID:179 |
