PlantDefenses213-page7

PlantDefenses213-page7 - have genes that code for receptor...

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Plant Stress and Defense Mechanisms - 7 Induced Chemical Defenses In addition to the always-present secondary metabolites, plants have rapid responses that are induced by the action of the predator or pathogen. These responses activate transduction pathways that lead to the production of chemical (and other) deterrents to predation and wounding. We shall examine a few of these. General Plant Signaling in Response to Predator/Pathogen Genetically Determined Pathogen Response Many plants have evolved some pathogen resistance through specific gene recognition that allows for some compromise in which a plant can permit some "munching" but prohibit virulent infestations. Both plant and non-virulent pathogens
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Unformatted text preview: have genes that code for receptor proteins. The plant genes are called "R" genes and the pathogen's genes " avr" genes (for avirulence or non-virulence). The signal molecule that activates the transduction pathway may be produced by the pathogen, such as peptides found in a bacterium, or wall fragments of a fungus, or be cell wall components of the plant broken when the pathogen munched. Oligosaccharins in plant cell walls may function as the recognition and signaling molecules for these reactions. These signal molecules for the Avr and R receptors are often call elicitors....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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