PlantDefenses213-page10

PlantDefenses213-page10 - wound area in response to the...

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Plant Stress and Defense Mechanisms - 10 Specific Immunity to RNA Viruses Viruses are among the most common plant pathogens, being able to infect both vertically (passed from generation to generation) and horizontally (through direct infection). Some plants have enzymes that can form double-stranded RNA from the viral RNA, and chop the double-stranded RNA into siRNA (small interference RNA), discussed briefly in Biology 211, to degrade the viral mRNA before it can be transcribed. Jasmonic Acid and Wound Response Another plant wound response to predator munching is achieved through signal transduction pathways activated by a small peptide, systemin, produced in the
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Unformatted text preview: wound area in response to the predators saliva. Systemin was first isolated from tomato plants. Systemin promotes fatty acids in the plasma membrane to be converted to jasmonic acid. Jasmonic acid moves through plasmodesmata to phloem sieve tubes throughout the plant and activates signal transduction pathways leading to proteinase inhibitors that bind to digestive enzymes of the predator. Dietary Defense Some plants produce an amino acid (canavanine) that gets incorporated into larvae that die when they substitute it for an amino acid needed in protein synthesis....
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