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Describe how the following bacterial species interact with their target host cells : a) Agrobacterium tumefaciens b) Vibrio cholerae
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Describe how the following bacterial species interact with their target host cells: a) Agrobacterium tumefaciens b) Vibrio cholerae AGROBACTERIUM TUMEFACIENS Agrobacterium tumefaciens is a common soil bacterium that causes crown gall disease of a wide range of dicotyledonous (broad-leaved) plants, especially members of the rose family such as apple, pear, peach, cherry, almond, raspberry and roses. Basically, the bacterium transfers part of its DNA to the plant host, and this DNA becomes stably integrated into the plant's genome, which when expressed causes the production of tumours and associated changes in plant metabolism. Agrobacterium tumefaciens is a Gram-negative, non-sporing, motile, rod-shaped bacterium, closely related to Rhizobium which forms nitrogen-fixing nodules on clover and other leguminous plants. Most of the genes involved in crown gall disease are not borne on the chromosome of Agrobacterium tumefaciens but on a large plasmid, termed the Ti (tumour-inducing) plasmid. In the same way, most of the genes that enable...
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