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Hormones213-page21 - Oligosaccaharin Systemin Systemin is a...

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Plant Growth Regulators - 21 Salicylic Acid Salicylic acid is known to activate defense genes for resistance against pathogen invaders, known as the hypersensitive response. (See plant defense responses discussion.) Salicylic acid, a phenolic extract from willow bark, was long used as an analgesic. It is now prepared commercially and is the active ingredient of aspirin. Oligosaccharins (Oligosaccharides) Oligosaccharins are short chain sugars in cell walls that may have a role in defense against pathogens. When a pathogen “chomps” on the oligosaccharide, the oligosaccharide activates a signal transduction pathway leading to plant defense responses (discussed with plant defenses) . They may also help regulate growth, differentiation and flower development by activating signal transduction pathways.
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Unformatted text preview: Oligosaccaharin Systemin Systemin is a small peptide found in wound tissue. It may stimulate defense activities as the signal molecule (ligand) that activates the signal transduction pathways that include the jasmonates. Jasmonates Jasmonates are a group of fatty acid derivatives. They appear to have a role in seed germination, root growth, and the storage of protein (especially in seeds). Jasmonates synthesized in response to signal molecules produced in wound areas are involved in the signal transduction pathways that result in secondary metabolites (protease inhibitors) that poison the predator, or synthesis of volatile molecules that attract the predator’s predators. (We will discuss plants and their defenses at the end of this unit.)...
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