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It neutralizes R gene products, so the HR does not occur. It prevents the release of salicylic acid, so SAR does not occur. It cleaves molecules in plant cuticle and allows the fungus to enter. It prevents the synthesis of secondary metabolites.
R loci occur in families because of gene duplication events. Plant defense systems are heritable, or genetically based. Secondary metabolites are the most efficient form of plant defense. Plant defense systems activate when an R gene product binds to an avr gene product.
The HR is not triggered, and the infection spreads. NO and ROI combine to kill cells at the site of infection. The SAR is triggered, and the infection does not spread to surrounding tissue. The HR is triggered, and the infection is stopped in its tracks.
any plant secondary metabolite that is used in defense and produced constitutively any plant secondary metabolite that is used in defense and produced in response to a pathogen attack any plant secondary metabolite any plant secondary metabolite that is used in defense
Phytoalexin production is initiated. Proteinase inhibitor production is initiated. Volatiles are released that attract parasitoids. SAR is initiated.
