Abstract: Plant R gene mediated defense responses include a series of physiological, biochemical and molecular activities. These responses begin with the initial hypersensitive response at the site of pathogen attack and end with systemic defenses or acquired resistance in tissues distant from the invasion sites. These responses are controlled by a defense signaling network, which is activated by the recognition of a plant resistance gene encoded protein, R protein, and a pathogen avirulence gene encoded protein, Avr protein, in a model of the receptor ligand recognition. The signal of the perception of the Avr protein by the R protein is transduced and amplified by the signal molecules, H 2O 2, NO and the systemic molecules SA, JA and ethylene to induce numerous defense related genes and metabolism enhancement, resulting in disease resistance. Plant defense probably uses similar mechanisms used in the animal immunity system. Increasing information about plant defense provides approaches to manipulate broad spectrum disease resistance in crops. Possible progresses of plant defense research in the near future are discussed in this review.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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Cited By Count: 2
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