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SCN: SCN Basics
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The phenylpropanoid pathway produces numerous compounds in response to aboitic and biotic stress. These compounds can help fight pests and pathogens and include flavonoids and isoflavonoids. Flavonoids also are precursors of pigments of fruits and flowers, while some isoflavonoids are phytoalexins. When pests and pathogens attack a plant, hydrogen peroxide produced by the oxidative burst induces the synthesis of isoflavonoids, which have a fifteen carbon backbone and include daidzein, medicarpin (pterocarpan), pisatin and glyceollin. Glyceollins are pterocarpans synthesized from the isoflavonoid, daidzein.
Some of the enzymes playing major roles in this phenylpropanoid synthesis and isoflavonoid phytoalexins include:PAL-phenylalanine ammonia lyase; cinnamate hydroxylase, coumarate ligase, acetyl CoA carboxylase, CHS-chalcone synthase, CHI-chalcone isomerase; CHR-chalcone reductase; IFS-isoflavone synthase; IFR-isoflavone reductase; CAD-
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