Agrobacterium tumefaciens, SEM

Agrobacterium tumefaciens, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Coloured scanning electron micrograph (SEM) of Agrobacterium tumefaciens, Gram-negative, plant pathogen, rod bacterium. Agrobacterium tumefaciens is an alphaproteobacteria from the family Rhizobiaceae and is known to cause tumours in plants. It causes crown gall disease (formation of tumours disease) in over 140 species of dicot plants. A. tumefaciens is a serious pathogen of grape vines, stone fruits, nut trees, sugar beets, horse radish and rhubarb. Agrobacterium sp. can transfer DNA between itself and plants and thus has become an important tool for genetic manipulation (genetic engineering). Most Agrobacterium sp. have plasmids that can be injected into plant cells at wound sites. The plasmid DNA is designed to integrate into the chromosomes of the infected plants cellular DNA. DNA transfer from Agrobacterium tumefaciens to eukaryotic plant cells is the only known example of interkingdom DNA transfer. Magnification: x3,000 when shortest axis

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