Phenolic-storing cells: keys to programmed cell death and periderm formation in wilt disease resistance and in general defence responses in plants?

Beckman, C.H.

doi:10.1006/pmpp.2000.0287

Cited by 523 publications

(333 citation statements)

References 49 publications

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“…Desta forma, dificilmente o teor de ácidos potencialmente ionizáveis poderia estar associado a propriedades antifúngicas ou conservadoras (BECKMAN, 2000).…”

Section: Caracterização Das Amostrasunclassified

Avaliação da atividade antifúngica de extratos fenólicos de cebola, farelo de arroz e microalga Chlorella phyrenoidosa

Souza¹,

Oliveira²,

Rocha³

et al. 2010

Ciênc. Tecnol. Aliment.

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Os compostos fenólicos (ferúlico, cinâmico e vanílico) presentes em tecidos vegetais possuem efeitos inibitórios no crescimento de fungos e produção de micotoxinas. Os ácidos ρ-hidroxibenzoico, vanílico e protocatequínico são inibidores somente em concentrações relativamente altas. O metil éster ácido cisferúlico e o metil éster ácido cis-3,4-dimetoxicinâmico, derivados do ácido cinâmico, são inibidores em pequenas concentrações, na faixa de 1 a 10 nM, evidenciando que a atividade inibitória depende não só da concentração, mas também da estrutura do composto (BAKAN et al., 2003;GRIFFIN, 1994;RASOOLI;ABYANEH, 2004). Estas demonstrações sugerem uma perspectiva de substituir aditivos químicos por conservadores naturais obtidos destas estruturas vegetais (BRULL; KLIS, 1999), o que atenderia à atual demanda de produção de alimentos seguros e implementaria o uso de porções vegetais usualmente descartadas (MELO; GUERRA, 2002). Para a extração dos compostos fenólicos de raízes, tubérculos, frutas, espécies dos gêneros de Acácia, Terminália, Copernicia, maçãs, ameixas e outros, vêm sendo usados sistemas aquosos, alcoólicos e acetoetílicos sob diferentes condições de interação (LIMA et al., 2004;SOUSA et al., 2007). A quantificação dos compostos fenólicos totais nos diferentes extratos tem empregado o reagente de Folin-Ciocalteau.Para o contexto da agroindústria da região Sul do Brasil, seria interessante conhecer o potencial de resíduos de cebola e de coprodutos de arroz como fonte de conservadores naturais para extração e utilização na preservação natural de alimentos, pois permitiria a valorização de matérias-primas e coprodutos de baixo valor comercial. No entanto, a atividade antifúngica, que vem sendo atribuída a compostos fenólicos usualmente presentes em tecidos destes vegetais, não tem sido estudada nestes recursos agrícolas.Apesar do conhecimento milenar dos benefícios da cebola, demonstrados em diversos estudos sobre seus efeitos bioativos, algumas regiões produtoras têm dificuldades em comercializar suas safras em condições satisfatórias para consumo in natura ou em formulações industriais, resultando em descarte de material e desestímulo aos produtores (EMATER, 2007). AbstractThe objective of this work was to relate the levels of total phenolic in onion, rice bran, and Chlorella phyrenoidosa with the antifungal activity tested against the fungus Rhyzopus oryzae. The phenolic compounds of onion were extracted in three solvent systems: aqueous, methanolic, and with ethila acetate, whereas the phenolic compounds of rice bran and Chlorella phyrenoidosa were extracted with methanol. The extracts were quantified with the Folin-Ciocalteau reagent. The method to evaluate the antifungal activity employed was the diluted Ágar technique. The Rhyzopus oryzae had its development inhibited in the presence of onion methanolic and aceto-ethylic extracts and rice bran methanolic extracts at the following phenolic concentrations, 86; 2.6, and 46 µg phenolic .mL -1 agar , respectively. The aqueous extracts from onion and the me...

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“…Desta forma, dificilmente o teor de ácidos potencialmente ionizáveis poderia estar associado a propriedades antifúngicas ou conservadoras (BECKMAN, 2000).…”

Section: Caracterização Das Amostrasunclassified

Avaliação da atividade antifúngica de extratos fenólicos de cebola, farelo de arroz e microalga Chlorella phyrenoidosa

Souza¹,

Oliveira²,

Rocha³

et al. 2010

Ciênc. Tecnol. Aliment.

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“…Phe-derived compounds are a major class of defense-associated metabolites (Naoumkina et al, 2010). Preformed phenolics are involved in the lignification of cell walls associated with the hypersensitive response (Beckman, 2000). Hydroxycinnamic acid amides fortify the plant cell wall by reducing its digestibility to pathogens (Facchini et al, 2002).…”

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confidence: 99%

Perturbation of Maize Phenylpropanoid Metabolism by an AvrE Family Type III Effector fromPantoea stewartii

et al. 2015

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Republic of Korea (S.-M.P., M.G.K.)AvrE family type III effector proteins share the ability to suppress host defenses, induce disease-associated cell death, and promote bacterial growth. However, despite widespread contributions to numerous bacterial diseases in agriculturally important plants, the mode of action of these effectors remains largely unknown. WtsE is an AvrE family member required for the ability of Pantoea stewartii ssp. stewartii (Pnss) to proliferate efficiently and cause wilt and leaf blight symptoms in maize (Zea mays) plants. Notably, when WtsE is delivered by a heterologous system into the leaf cells of susceptible maize seedlings, it alone produces water-soaked disease symptoms reminiscent of those produced by Pnss. Thus, WtsE is a pathogenicity and virulence factor in maize, and an Escherichia coli heterologous delivery system can be used to study the activity of WtsE in isolation from other factors produced by Pnss. Transcriptional profiling of maize revealed the effects of WtsE, including induction of genes involved in secondary metabolism and suppression of genes involved in photosynthesis. Targeted metabolite quantification revealed that WtsE perturbs maize metabolism, including the induction of coumaroyl tyramine. The ability of mutant WtsE derivatives to elicit transcriptional and metabolic changes in susceptible maize seedlings correlated with their ability to promote disease. Furthermore, chemical inhibitors that block metabolic flux into the phenylpropanoid pathways targeted by WtsE also disrupted the pathogenicity and virulence activity of WtsE. While numerous metabolites produced downstream of the shikimate pathway are known to promote plant defense, our results indicate that misregulated induction of phenylpropanoid metabolism also can be used to promote pathogen virulence.

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“…Plants react to diverse phytopathogens by using constitutive or induced phenolic substances, affecting the susceptibility or resistance characteristics of the plant (Beckman, 2000).…”

Section: Resultsmentioning

confidence: 99%

Differential susceptibility of Morettini pears to blue mold caused by Penicillium expansum

Sánchez

Serrano

Oliveira

et al. 2016

Emir. J. Food Agric

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Phenolic-storing cells: keys to programmed cell death and periderm formation in wilt disease resistance and in general defence responses in plants?

Cited by 523 publications

References 49 publications

Avaliação da atividade antifúngica de extratos fenólicos de cebola, farelo de arroz e microalga Chlorella phyrenoidosa

Avaliação da atividade antifúngica de extratos fenólicos de cebola, farelo de arroz e microalga Chlorella phyrenoidosa

Perturbation of Maize Phenylpropanoid Metabolism by an AvrE Family Type III Effector fromPantoea stewartii

Differential susceptibility of Morettini pears to blue mold caused by Penicillium expansum

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