Agrobacterium tumefaciens, SEM

Agrobacterium tumefaciens, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: 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. Most Agrobacterium sp. have plasmids that they can inject into plant cells at wound sites. This plasmid DNA is designed to integrate into the chromosomes of the infected plant's 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 printed at 25 millimetres.

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