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Histological and ultrastructural analyses revealed that epidermal cells of Si+ plants reacted to B. graminis f. sp. tritici attack with specific defense reactions including papilla formation, production of callose, and release of electron-dense osmiophilic material identified by cytochemical labeling as glycosilated phenolics. Phenolic material not only accumulated along the cell wall but also was associated with altered integrity of haustoria in a manner similar to localized phytoalexins as reported from other pathosystems. These results strongly suggest that Si mediates active localized cell defenses against B. graminis f. sp. tritici attack. <\/jats:p>","DOI":"10.1094\/phyto.2003.93.4.402","type":"journal-article","created":{"date-parts":[[2007,5,11]],"date-time":"2007-05-11T11:20:39Z","timestamp":1178882439000},"page":"402-412","source":"Crossref","is-referenced-by-count":277,"title":["Cytological Evidence of an Active Role of Silicon in Wheat Resistance to Powdery Mildew (<i>Blumeria graminis<\/i> f. sp. <i>tritici<\/i>)"],"prefix":"10.1094","volume":"93","author":[{"given":"R. R.","family":"B\u00e9langer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicole","family":"Benhamou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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