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The 3-hydroxy-2-butanone pathway is required for Pectobacterium carotovorum pathogenesis
Maria del Pilar Marquez-Villavicencio1, Brooke Weber, R Andrews Witherell
1Department of Plant Pathology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.
Pectobacterium carotovorum subsp. carotovorum uses the 2,3-butanediol pathway to cause soft rot in potatoes. Disrupting this pathway reduced its virulence and ability to alkalinize its environment.
Area of Science:
- * Plant Pathology
- * Microbiology
- * Molecular Biology
Background:
- * Pectobacterium species are major bacterial pathogens causing soft rot diseases in crops like potatoes globally.
- * The 2,3-butanediol pathway is significant as its volatile compounds influence plant growth, attract insects, and impact bacterial fitness.
- * Gene expression analysis revealed higher budB expression (encoding α-acetolactate synthase) in potato tubers compared to stems.
Purpose of the Study:
- * To investigate the role of the 2,3-butanediol pathway in Pectobacterium carotovorum subsp. carotovorum virulence and pathogenicity in potato tubers.
- * To determine the impact of disrupting the 2,3-butanediol pathway on bacterial virulence and environmental alkalinization.
Main Methods:
- * Gene expression analysis to identify differentially expressed genes in potato tubers versus stems.
- * Genetic manipulation to create a disruption mutant in the 2,3-butanediol pathway of P. c. subsp. carotovorum WPP14.
- * Virulence assays on potato tubers and measurement of medium/tuber alkalinization under anaerobic conditions.
Main Results:
- * Disruption of the 2,3-butanediol pathway significantly reduced the virulence of P. c. subsp. carotovorum WPP14 on potato tubers.
- * The 2,3-butanediol pathway disruption impaired the alkalinization of both the growth medium and potato tubers under anaerobic conditions.
- * Pectobacterium pectate lyases exhibit optimal activity at alkaline pH, suggesting alkalinization aids in plant cell maceration.
Conclusions:
- * The 2,3-butanediol pathway plays a crucial role in the virulence of Pectobacterium carotovorum subsp. carotovorum on potato tubers.
- * Environmental alkalinization, facilitated by this pathway, is a key factor contributing to the maceration of potato tissues.
- * Targeting the 2,3-butanediol pathway presents a potential strategy for managing soft rot diseases in potatoes.
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