title: Production of phytoalexins in peanut (Arachis hypogaea) seed elicited by selected microorganisms.
abstract: Under favorable conditions, the peanut plant demonstrates appreciable resistance to fungal invasion by producing and accumulating phytoalexins, antimicrobial stilbenoids. This mechanism for resistance is little understood, yet it is crucial for breeding and genetically modifying peanut plants to develop new cultivars with fungal resistance. The dynamics of phytoalexin production in peanut seeds and embryos challenged by selected important fungi and bacteria was investigated. Different biotic agents selectively elicited production of major peanut stilbenoids, resveratrol, arachidin-1, arachidin-3, and SB-1.  Aspergillis  species, compared to other biotic agents, were more potent elicitors of stilbenoids. Embryos demonstrated significantly higher production of stilbenoids compared to cotyledons and may serve as a convenient source of genetic material in isolating genes for peanut plant defense enhancement.
authors: National Peanut Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Dawson, Georgia 39842, United States. vsobolev@nprl.usda.gov
authors: Victor S
authors: VS
authors: Sobolev
mesh_terms: D010367:Arachis / Q000378:metabolism* / Q000382:microbiology*; D018407:Bacterial Physiological Phenomena; D005658:Fungi / Q000502:physiology; D000077185:Resveratrol; D012639:Seeds / Q000378:metabolism / Q000382:microbiology; D012717:Sesquiterpenes / Q000378:metabolism*; D013267:Stilbenes / Q000378:metabolism; D000094162:Phytoalexins
chemical_list: D012717:Sesquiterpenes; D013267:Stilbenes; D000077185:Resveratrol; D000094162:Phytoalexins