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Plants Respond to Attacks by Herbivores and Pathogens

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Dustin Phan

on 8 January 2013

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Transcript of Plants Respond to Attacks by Herbivores and Pathogens

Respond to Attacks by Herbivores and Pathogens Plants Defense Against Herbivores Defense Against Pathogens Plants used physical (thorns) and chemical (toxins) defenses to prevent damage.
ex. Canavanine in the jackbean
Some plants recruit predatory animals that help defend the plant.
ex. parasitoid wasp and leaf vs. catipillar The volatile molecules a plant releases in response to a threat also functions as a warning signal to nearby plants of the same species.
When the plant is damaged, it sends a signal so that the nearby plants will express their defense genes.
non infested plants will be less vulnerable to the threat.
The End First line of defense: Physical Barrier
made up of the epidermis (primary plant body) and periderm (secondary)
viruses and bacteria can still enter through a plant's natural opening (stomata)
Secondary Defense: Chemical
once a pathogen enters the plant
plant releases a chemical that will detect and destroy pathogen on sight Virulent
a pathogens against a plant who has a little specific defenses
The pathogen that gets into its host and does not severely damage or kill the plant.
Strains of pathogens that only mildly harm the host plant
Gene-for-Gene Recognition
a widespread form of plant disease resistance that involves recognition of pathogen derived molecules by the protein products of a specific plant disease resistance (R) genes. Hypersensitive Response
Defense response that causes cell and tissue death near infected site, restricting the spread of pathogen
Occurs when phytoalexins are produced
We can see it as lesions on a plant. Systemic Acquired Response
systemic expression of defense gases
protection against pathogens for days
caused by identification of methlsalicyic acid; which is converted into salicylic acid 39.5
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