detoxification of benzoxazolinone allelochemicals from wheat by gaeumannomyces graminis var. tritici, g. graminis var. graminis, g. graminis var. avenae, and fusarium culmorum.the ability of phytopathogenic fungi to overcome the chemical defense barriers of their host plants is of great importance for fungal pathogenicity. we studied the role of cyclic hydroxamic acids and their related benzoxazolinones in plant interactions with pathogenic fungi. we identified species-dependent differences in the abilities of gaeumannomyces graminis var. tritici, gaeumannomyces graminis var. graminis, gaeumannomyces graminis var. avenae, and fusarium culmorum to detoxify these allelo ...19989647804
melanin synthesis is associated with changes in hyphopodial turgor, permeability, and wall rigidity in gaeumannomyces graminis var. graminis.mycelia of gaeumannomyces graminis var. graminis form large cells called hyphopodia with deeply lobed, melanized walls. like appressoria produced by other pathogens, hyphopodia develop on hydrophobic surfaces, but it is not clear that hyphopodia function as platforms for host penetration. in appressoria, melanin synthesis is linked to the generation of enormous turgor pressures that provide the necessary force for plant penetration. in the present study, hyphopodial turgor was measured in a wild ...19989742204
survival, growth and pathogenicity of gaeumannomyces graminis var. graminis with different methods of long-term storage.the fungal plant pathogen gaeumannomyces graminis var. graminis was preserved with 12 different storage methods. five strains, each with unique morphological and pathological characteristics, were used for comparison of the methods. the storage treatments included potato-dextrose agar slants, with or without mineral oil, stored at either 4 c, 28 c or ambient temperature; colonized agar plugs placed in glycerol solution at either -75 c or -20 c; colonized agar plugs placed in sterile deionized wa ...200516457359
effects of some benzoxazinoids on in vitro growth of cephalosporium gramineum and other fungi pathogenic to cereals and on cephalosporium stripe of winter wheat.the benzoxazolinones benzoxazolin-2(3h)-one (boa) and 6-methoxybenzoxazolin-2(3h)-one (mboa) and selected degradation products of these compounds were examined for their in vitro antifungal activity against cephalosporium gramineum, gaeumannomyces graminis var. graminis, and fusarium culmorum. boa was also applied to the soil-incorporated inoculum of c. gramineum to test its capability of reducing cephalosporium stripe disease in winter wheat. mboa reduced the mycelial growth of g. graminis var. ...200616478214
melanin production by a filamentous soil fungus in response to copper and localization of copper sulfide by sulfide-silver staining.gaeumannomyces graminis var. graminis, a filamentous soil ascomycete, exhibited enhanced cell wall melanin accumulation when exposed to as little as 0.01 mm cuso(inf4) in minimal broth culture. because its synthesis was inhibited by tricyclazole, the melanin produced in response to copper was dihydroxynaphthalene melanin. an additional hyphal cell wall layer was visualized by electron microscopy when hyphae were grown in the presence of copper and fixed by cryotechniques. this electron-dense lay ...199516535031
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