Caption: Pseudomonas syringae - Gram-negative, aerobic, rod prokaryote. Pseudomonas syringae is a saprophytic strain that is a primarily a plant pathogen that was originally isolated from an apple leaf. There are 41 pathovars of P. syringae which are able to cause diseases on various plants. An antagonistic strain occurs as a non-pathogenic counterpart and the strain is antagonistic towards pathogens on many plants, especially fungi. It can grow well on wounded plant tissue and can control a variety of diseases on different fruits, including pome fruits, banana, and citrus fruits as well as vegetables. Pseudomonas species are able to grow in extreme environments. Any carbon or hydrocarbon source is a suitable place for them to live. Most Pseudomonas species produce a slime layer that cannot be phagocytosed, and aids in the production of surface-colonizing biofilms. The bacterial genus Pseudomonas (pseudomonad) includes, the human pathogen P. aeruginosa, the ubiquitous soil bacterium P. putida, and some species that are known to cause problems in dairy products. P. aeruginosa usually causes problems in humans who have already have had their immune systems weakened. This complicated, resistant bacteria causes skin infections, urinary tract infections and septicemia.
Magnification*: x3,400
Type: SEM
Copyright 2007 Dennis Kunkel Microscopy, Inc.
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