Significance of phenolic compounds in plant‐soil‐microbial systems

Siqueira, José Oswaldo; Nair, Muraleedharan G.; Hammerschmidt, Raymond; Safir, Gene R.; Putnam, A. R.

doi:10.1080/07352689109382307

Cited by 269 publications

(160 citation statements)

References 416 publications

(247 reference statements)

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“…If such phenolic compounds are involved in the observed inhibition of ACCox activity by VAM infection, a role for a conjugate of ferulic acid seems more likely, because ferulic acid can inhibit plant P uptake and VAM fungal growth (23,36). It is worth noting that some fungi are capable of metabolizing plant phenolic compounds or producing phenolics themselves (31); however, the capabilities of VAM fungi in this regard have not been investigated.…”

Section: Discussionmentioning

confidence: 99%

Resistance Responses of Potato to Vesicular-Arbuscular Mycorrhizal Fungi under Varying Abiotic Phosphorus Levels

McArthur¹,

Knowles²

1992

Plant Physiol.

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In mycorrhizal symbioses, susceptibility of a host plant to infection by fungi is influenced by environmental factors, especially the availability of soil phosphorus. This study describes morphological and biochemical details of interactions between a vesicular-arbuscular mycorrhizal (VAM) fungus and potato (Solanum tuberosum L. cv Russet Burbank) plants, with a particular focus on the physiological basis for P-induced resistance of roots to infection. Root infection by the VAM fungus Glomus fasciculatum ([Thaxt. sensu Gerdemann] Gerdemann and Trappe) was extensive for plants grown with low abiotic P supply, and plant biomass accumulation was enhanced by the symbiosis. The capacity of excised roots from P-deficient plants to produce ethylene in the presence or absence of exogenous 1-amino cyclopropane-1-carboxylic acid (ACC) was markedly reduced by VAM infection. This apparent inhibition of ACC oxidase (ACCOX) activity was localized to areas containing infected roots, as demonstrated in split-root studies. Furthermore, leachate from VAM roots contained a potent water-soluble inhibitor of ethylene generation from exogenous ACC by nonmycorrhizal (NM) roots. The leachate from VAM-infected roots had a higher concentration of phenolics, relative to that from NM roots. Moreover, the rates of ethylene formation and phenolic concentration in leachates from VAM roots were inversely correlated, suggesting that this inhibitor may be of a phenolic nature. The specific activity of extracellular peroxidase recovered in root leachates was not stimulated by VAM infection, although activity on a fresh weight basis was significantly enhanced, reflecting the fact that VAM roots had higher protein content than NM roots. Polyphenol oxidase activity of roots did not differ between NM and VAM roots. These results characterize the low resistance response of P-deficient plants to VAM infection. When plants were grown with higher abiotic P supply, the relative benefit of the VAM symbiosis to plant growth decreased and root infection was lower. The in vivo ACCOX activity was also greater in roots of plants grown on high levels of P compared with those grown on low levels, although the influence of VAM infection was partially to counteract the nutritional effect of P on ACCOX activity. Similar to ACCOX activity, extracellular peroxidase activity of roots increased linearly with increasing abiotic P supply, thus indicating a greater potential for resistance to VAM infection. These findings suggest that VAM fungi may alter phenolic metabolism of roots so as to hinder ethylene production and the root's ability to invoke a defense response. Raising the abiotic P supply to plants at least partially restores the capacity of roots to produce ethylene and may, in this way, increase the root's resistance to VAM infection. The VAM2 fungi are a small and distinct group of obligate, symbiotic fungi that are capable of association with roots of most terrestrial vascular plants (20). In exchange for photoassimilates, VAM fungi contribute to t...

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Section: Discussionmentioning

confidence: 99%

Resistance Responses of Potato to Vesicular-Arbuscular Mycorrhizal Fungi under Varying Abiotic Phosphorus Levels

McArthur¹,

Knowles²

1992

Plant Physiol.

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“…Segundo Siqueira et al (1991), estudos com compostos fenólicos abrem novas perspectivas para a utilização de FMA, acelerando a colonização e maximizando os benefícios que estes fungos proporcionam às plantas, além de estimularem a população nativa de FMA, destacando o isoflavonóide formononetina como o composto mais ativo.…”

Section: Introductionunclassified

Influência de fungos micorrízicos arbusculares, associada à adição de compostos fenólicos, no crescimento de mudas de maracujazeiro amarelo (Passiflora edulis f. flavicarpus)

Soares

Martins²

2000

Rev. Bras. Ciênc. Solo

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RESUMORealizou-se um experimento em casa de vegetação, com o objetivo de avaliar a influência da inoculação com fungos micorrízicos arbusculares (FMAs), associada à adição de formononetina (nas concentrações de 0, 5 e 10 µ mol L -1 ), quercetina e morina (nas concentrações de 0, 5, 10 e 15 µ mol L -1 ), no crescimento e teor de nutrientes de mudas de maracujazeiro, avaliadas em duas fases: produção das mudas em substrato estéril e após o transplantio para substrato não-estéril. Utilizaram-se as espécies Glomus clarum (Gc) e Glomus fasciculatum (Gf) e uma população nativa de FMAs (IN) isolada de um plantio de maracujá no município de São João da Barra (RJ). Todos os FMAs avaliados (Gc, Gf e IN) proporcionaram aumentos significativos na produção de matéria seca e no teor de nutrientes na fase de produção de mudas e após o transplantio para substrato não-estéril. A aplicação dos compostos fenólicos teve efeito apenas na fase após o transplantio, destacando-se as plantas não inoculadas que mostraram efeito benéfico da aplicação dos flavonóis quercetina e morina e do isoflavonóide formononetina (apenas na concentração 5 µ mol L -1 ) na colonização radicular pelos FMAs, indicando que tais compostos estimularam a população nativa de FMAs presente no substrato. Nas plantas inoculadas, não se verificou efeito dos compostos na colonização radicular pelo fungo, mas observou-se efeito positivo em algumas das variáveis analisadas.Termos de indexação: micorrizas, formononetina, quercetina, morina.(1) Parte da Tese de Doutorado do primeiro autor, apresentada à Universidade Estadual do Norte Fluminense -UENF. Recebido para publicação em abril de 1999 e aprovado em julho de 2000.

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“…The concentration of phenolic compounds in plant tissues varies with the rate of metabolic catabolism and biosynthesis. It can be influenced by hormonal balance, or it can be directly controlled by enzymes and by the balance of the enzyme substrates (SIQUEIRA et al, 1991). Other factors, such as carbohydrates, nutrition and water quality, may influence the biosynthesis of phenolics and the differences in the concentrations and types of phenolic composition of plant species.…”

Section: Quantification Of Phenolic Compoundsmentioning

confidence: 99%

“…Stress can also influence the release of polyphenols from vacuoles as well as the new synthesis of phenols (McCONCHIE et al, 1994). For example, groups of phenolics such as ferulic acid and p-coumaric acid are commonly found in the roots, while isoflavonoids occur primarily in the leaves and are less prevalent in the petioles, stems and roots (SIQUEIRA et al, 1991).…”

Section: Quantification Of Phenolic Compoundsmentioning

confidence: 99%

<b>The influence of planting and harvesting times on the total phenolic content and antioxidant activity of <i>Talinum triangulare</i> (Jacq.) Willd

et al. 2015

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ABSTRACT. The purpose of this study was to evaluate the influence of planting and harvesting times on the polyphenol content and antioxidant capacity of Talinum triangulare cultivated during two different seasons (winter or summer) and harvested 30 or 60 days after seedling establishment. Polyphenol content was quantified with the Folin-Ciocalteu method, and antioxidant activity was quantified with free-radical DPPH (1,1-diphenyl-2-picrilhidrazina). The highest levels of polyphenols were obtained from winter planting and from harvesting at 30 days. Antioxidant activity differed significantly in response to variation in planting and harvesting times, reaching 56.97% in extracts of plants produced in the winter and harvested at 30 days after planting. The times of planting and harvesting markedly influenced the content of polyphenols, and thus the antioxidant activity, of T. triangulare.Keywords: portulacaceae, waterleaf, DPPH, polyphenol.Efeito da época de plantio e colheita sobre o teor de fenólicos totais e atividade antioxidante de Talinum triangulare (Jacq.) Willd RESUMO. O objetivo deste estudo foi avaliar a influência das épocas de plantio e colheita no teor de polifenóis e capacidade antioxidante de Talinum triangulare cultivadas em duas estações do ano (inverno e verão) e coletadas 30 e 60 dias após plantio. A quantificação dos polifenóis foi realizada pelo método de Folin-Ciocalteu e a atividade antioxidante por DPPH. Níveis elevados de polifenóis foram obtidos na semeadura de inverno e colheita em 30 dias. A atividade antioxidante variou significativamente entre as épocas de plantio e colheita de plantas, chegando a 56,97% nos extratos das plantas produzidas no inverno e colhidas aos 30 dias após a semeadura. Os dados mostraram que a época de plantio e de colheita influenciou o teor de polifenóis e, por conseguinte, a atividade antioxidante de T. triangulare.

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Significance of phenolic compounds in plant‐soil‐microbial systems

Cited by 269 publications

References 416 publications

Resistance Responses of Potato to Vesicular-Arbuscular Mycorrhizal Fungi under Varying Abiotic Phosphorus Levels

Resistance Responses of Potato to Vesicular-Arbuscular Mycorrhizal Fungi under Varying Abiotic Phosphorus Levels

Influência de fungos micorrízicos arbusculares, associada à adição de compostos fenólicos, no crescimento de mudas de maracujazeiro amarelo (Passiflora edulis f. flavicarpus)

<b>The influence of planting and harvesting times on the total phenolic content and antioxidant activity of <i>Talinum triangulare</i> (Jacq.) Willd

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