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The Genetic and Chemical Basis of Recognition in the Agrobacterium: Plant Interaction

  • Chapter
Bacterial Pathogenesis of Plants and Animals

Part of the book series: Current Topics in Microbiology and Immunology ((CT MICROBIOLOGY,volume 192))

Abstract

Agrobacterium tumefaciens is a gram-negative soil bacterium that causes crown gall tumors on a broad spectrum of dicotyledonous plants (for reviews see: BINNS and THOMASHOW 1988; WINANS 1992; ZAMBRYSKI 1992) . This pathogenic response results from the activities of a large tumor-inducing (Ti) plasmid that resides in many but not all agrobacteria found in the rhizosphere. The infection and transformation process is a complex series of interactions between host and pathogen that ultimately leads to the transfer of DNA (the T-DNA) from the Ti plasmid into the plant cell where it is integrated into the nuclear genome. Expression of this T-DNA results in the production of two classes of protein products: (1) enzymes that synthesize plant hormones capable of stimulating continuous cell division in the transformed cells and (2) enzymes that synthesize unique amino acid:sugar acid conjugates, termed opines, that are not metabolizable by the host cell but are metabolized by the inciting bacterium, providing it with a dedicated nitrogen and carbon source.

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  1. Plant Science Institute, Department of Biology, University of Pennsylvania, Philadelphia, PA, 19104-6018, USA

    A. N. Binns & V. R. Howitz

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  1. Max-Delbrück-Laboratory, Carl-von-Linné-Weg 10, 50829, Cologne, Germany

    Jeffery L. Dangl

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Binns, A.N., Howitz, V.R. (1994). The Genetic and Chemical Basis of Recognition in the Agrobacterium: Plant Interaction. In: Dangl, J.L. (eds) Bacterial Pathogenesis of Plants and Animals. Current Topics in Microbiology and Immunology, vol 192. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78624-2_6

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