1998
DOI: 10.1094/phyto.1998.88.5.396
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Silicon-Mediated Accumulation of Flavonoid Phytoalexins in Cucumber

Abstract: The controversial role of silicon in plant disease resistance, described mostly as a passive mechanical protection, has been addressed. Conclusive evidence is presented that silicon is involved in the increased resistance of cucumber to powdery mildew by enhancing the antifungal activity of infected leaves. This antifungal activity was attributable to the presence of low-molecular-weight metabolites. One of these metabolites, described here as a phytoalexin, was identified as a flavonol aglycone rhamnetin (3,5… Show more

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Cited by 344 publications
(247 citation statements)
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“…The second conclusion was originally proposed by Fawe et al (49), who compared the role of Si to that of other known messengers of induced resistance such as salicylic acid or jasmonic acid. In their model, the authors suggested that the soluble fraction of Si acted as a modulator of induced resistance whereby the plants would respond faster or more efficiently to a pathogen attack.…”
Section: Discussionmentioning
confidence: 95%
See 1 more Smart Citation
“…The second conclusion was originally proposed by Fawe et al (49), who compared the role of Si to that of other known messengers of induced resistance such as salicylic acid or jasmonic acid. In their model, the authors suggested that the soluble fraction of Si acted as a modulator of induced resistance whereby the plants would respond faster or more efficiently to a pathogen attack.…”
Section: Discussionmentioning
confidence: 95%
“…This hypothesis came under scrutiny when reports of root pathogens being controlled by Si and an absence of Si deposition under conditions of saturated humidity contradicted this putative modus operandi of Si (48). Additional evidence that defense reactions were elicited faster in plants treated with Si led some authors to suggest that Si exerted its beneficial role against plant diseases as a modulator of induced resistance (49). Our microarray results confirm that Si-treated plants still react to pathogen inoculation through the up-regulation of defense-and pathogenesis-related genes.…”
Section: Discussionmentioning
confidence: 99%
“…However enhanced disease resistance cannot be explained solely by physical barrier mechanism. It has been reported that Si-induced plant resistance can be also related to increased activity of defense related enzymes such as POD and PPO as well as higher accumulation of antifungal compounds such as phytoalexins (Borel et al, 2005;Fawe et al, 1998;Rodrigues et al, 2004). Therefore, further studies are needed to clarify this phenomenon.…”
Section: Discussionmentioning
confidence: 99%
“…(Cherif et al, 1994). Increased fl avonoid phytoalexin aglycone rhamnetin in cucumber plants due to silicon treatment decreased severity of powdery mildew caused by Podosphaera xanthii (Fawe et al, 1998). Enhanced glycosylated phenolics and lignin activities in epidermal cells of silicon-treated wheat reduced severity of Blumeria graminis f.sp.…”
Section: Antifungal Compoundsmentioning
confidence: 99%