Sabine R. Ulibarri. Critical Essays

Levine, Virginia Brownell; Santos, Maria Inês; Fuente, P. de la

doi:10.2307/345345

Cited by 10 publications

(23 citation statements)

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“…Reversible protein phosphorylation is a core component of eukaryoti¢ cell signalling [36], with plant-pathogen interaction being no exception [37]. Inhibition of protein phosphorylation by the kinase inhibitor K-252a has been shown to prevent AOS release in soybean [4,38], parsley [22] and harpin-elicited tobacco cell suspensions [32]. Here we have shown that it also prevents harpin.induced AOS generation in Arabidopsis cell cultures.…”

Section: Discussionmentioning

confidence: 63%

“…These AOS include superoxide (O[-), hydrogen peroxid,: (H202), and the hydroxyl radical (OH') [1,2]. The signifivance of AOS acting as a signal towards host defense in plant-pathogen interactions has been demonstrated by HaO2.mediated oxidative cross-linking of the plant cell wall during HR [3,4], phytoalexin formation in cultured cells [5][6][7] and induction of cellular protection genes [4].…”

Section: Introductionmentioning

confidence: 99%

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Generation of active oxygen in elicited cells of Arabidopsis thaliana is mediated by a NADPH oxidase‐like enzyme

et al. 1996

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Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Generation of active oxygen in elicited cells of Arabidopsis thaliana is mediated by a NADPH oxidase‐like enzyme

et al. 1996

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“…hydroxy radicals and superoxides) by AsA might accelerate the JA-inducible sakuranetin production. Previous studies on HWC and oligosaccharide elicitation suggest that AOS are important in activating plant defense systems including phytoalexin production [14,19,20]. It is speculated that AOS might also play important roles in phytoalexin production by exogenously applied JA in plants.…”

Section: Effect Of Free Radical Scavengers On Phytoalexin Productionmentioning

confidence: 99%

Phytoalexin production elicited by exogenously applied jasmonic acid in rice leaves (Oryza sativa L.) is under the control of cytokinins and ascorbic acid

Tamogami¹,

Rakwal²,

Kodama³

1997

FEBS Letters

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Jasmonic acid (JA) has been shown to be a signaling compound which elicits the production of secondary metabolites including phytoalexins in plants. It has been shown that the phytoalexin production is elicited by exogenously applied JA in rice leaves. We now show that this phytoalexin production by exogenously applied JA is significantly counteracted by cytokinins, kinetin and zeatin. Kinetin and zeatin also inhibit the induction of naringenin-7-O-methyltransferase (a key enzyme in rice phytoalexin production) by JA. A natural free radical scavenger, ascorbic acid (AsA) shows both counteractive and enhancing effects on JA-inducible phytoalexin production, depending on its concentration. This effect of AsA suggests that active oxygen species (AOS) may play important roles in phytoalexin production by JA in rice leaves.

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“…Finally, after the discovery of p47 p h OX : p67 p h OX and p22 p h OX [4], the demonstration in this paper of the presence of a Rac2 Fig. 5.…”

Section: Discussionmentioning

confidence: 65%

“…A rapid and characteristic event of the elicited cells response is the release of active oxygen species (AOS) which is termed the oxidative burst [2,3]. Because the generation of AOS is believed to contribute to several resistance strategies of the plant [3,4], the mechanism of their formation and its regulation is a current topic of great interest [5].…”

Section: Introductionmentioning

confidence: 99%

Tobacco cells contain a protein, immunologically related to the neutrophil small G protein Rac2 and involved in elicitor‐induced oxidative burst

Kieffer¹,

Simon-Plas²,

Maume³

et al. 1997

FEBS Letters

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Suspension-cultured cells of Nicotiana tabacum generated active oxygen species (AOS) when they were treated with the proteinaceous elicitor, cryptogein. This response was blocked by diphenylene iodonium, an inhibitor of the neutrophil NADPH oxidase. When microsomal extracts of tobacco cells were probed with an antibody directed against the human small G protein Rac2, two immunoreactive proteins were detected at 18.5 and 20.5 kDa. The same experiment performed with cytosolic extracts of tobacco cells led to the observation of a strong immunoreactive protein at 21.5 kDa only in the cryptogeintreated cells. The appearance of this cytosolic protein was related to the production of AOS by the elicited cells. These results provide evidence for the possible involvement of small G proteins, homologous to the neutrophil Rac2 protein, in the regulation of the elicitor-induced oxidative burst in plant.

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Sabine R. Ulibarri. Critical Essays

Cited by 10 publications

References 0 publications

Generation of active oxygen in elicited cells of Arabidopsis thaliana is mediated by a NADPH oxidase‐like enzyme

Generation of active oxygen in elicited cells of Arabidopsis thaliana is mediated by a NADPH oxidase‐like enzyme

Phytoalexin production elicited by exogenously applied jasmonic acid in rice leaves (Oryza sativa L.) is under the control of cytokinins and ascorbic acid

Tobacco cells contain a protein, immunologically related to the neutrophil small G protein Rac2 and involved in elicitor‐induced oxidative burst

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