Seleção de antagonistas fúngicos a Fusarium solani e Fusarium oxysporum em substrato comercial para mudas

Ethur, Luciana Zago; Blume, Elena; Muniz, Marlove Fátima Brião; Flores, Maria Georgina Veiga

doi:10.1590/s0103-84782007000600047

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…As demonstrated by Azevedo et al (2000), endophytic microorganisms have gained interest for use in biological control, where it is necessary to develop viable alternatives for reducing the use of chemicals, such as fungicides and pesticides, as well as the recurrent problems of their indiscriminate use. Complex interactions between the plant and beneficial microbiota make the use of chemical controllers difficult, because its use can be detrimental to beneficial microorganisms, besides having negative environmental effects (Ethur et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Biotechnological prospecting of foliar endophytic fungi of guaco (Mikania glomerata Spreng.) with antibacterial and antagonistic activity against phytopathogens

et al. 2015

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Mikania glomerata (Spreng.), popularly known as "guaco", is a plant from the Asteraceae family that has many therapeutic properties. The use of medicinal plants has been examined in studies on endophytic diversity and bioprospecting; endophytes inhabit the interior of plants without harming them. Microorganism-host complex interactions are related to the production of compounds that may confer resistance to pathogens or to production of bioactive compounds or growth regulators. In this study, we evaluated foliar endophytic fungi of M. glomerata to examine the control of plant pathogens, molecular identification, and production of compounds with antimicrobial activity. In the antagonism test, 6-mm diameter disks were placed equidistant from the endophyte and plant pathogen, and pathogen growth area was measured. The endophytic strains G-01, G-02, and G-03 were effective against Fusarium solani and Didymella bryoniae. The endophyte rDNA regions corresponding to internal transcribed spacer 1-5.8S-internal transcribed spacer 2 were sequenced, and the results were compared with sequences deposited in the NCBI database. The G-01, G-02, and G-03 strains were identified as Diaporthe citri. This identification was confirmed by phylogenetic analysis. The crude extract of the secondary metabolites of the G-01 strain was tested against Escherichia coli and Staphylococcus aureus; the metabolites showed antimicrobial activity against S. aureus. The endophytes tested in this study have potential for use in biotechnological applications.

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Section: Discussionmentioning

confidence: 99%

Biotechnological prospecting of foliar endophytic fungi of guaco (Mikania glomerata Spreng.) with antibacterial and antagonistic activity against phytopathogens

et al. 2015

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“…The main mechanisms involved are related to the bioavailability of nutrients, such as phosphate solubilization and biological N fixation, and biotic and abiotic stress alleviation [73]. Among the main genera of plant growth-promoting organisms are Bacillus and Pseudomonas, known as plant growth-promoting bacteria (PGPB) [14,73], and Penicillium and Trichoderma, known as plant growth-promoting fungus (PGPF), and soil biocontrol promoters [14,[74][75][76]. Atmospheric N fixation could also be associated with the presence of Bradyrhizobium and Rhizobium [77].…”

Section: Enzyme Activity and Biodiversity Under Varying Crop Yield En...mentioning

confidence: 99%

“…The genera Penicillium, Bacillus, Pseudomonas, and Trichoderma play an important role in plant protection from Fusarium attack [74][75][76][82][83][84] through the production of antibiotic bioproducts, the modulation of ACC deaminase expression, and by increasing soil nutrient uptake that results in higher plant photosynthesis rates and plant vigour status. In addition, these microorganisms could induce a reprogramming of plant gene expressions that increases plants' ability to cope with biotic and abiotic stresses [74,75,[85][86][87].…”

Section: Enzyme Activity and Biodiversity Under Varying Crop Yield En...mentioning

confidence: 99%

Soil Health Check-Up of Conservation Agriculture Farming Systems in Brazil

et al. 2021

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Conservation agriculture has been promoted as the main strategy to regenerate soil life but its effect on soil enzyme activity remains little documented. This study investigated the β-glucosidase and arylsulfatase enzymes as tools to evaluate soil health at the field level. Croplands in four main grain-producing states in Brazil were selected for this study. In each cropland, three environments (high yield (HYE), medium yield (MYE), and low yield (LYE)) were delineated for soil sampling to determine soil chemical attributes and enzyme activity. In one of these fields with a large temporal database, soil DNA characterization was also undertaken. The two soil enzymes investigated were affected by a range of soil attributes and the most important of these were identified. Around 40% of the data points sampled had low soil organic matter content; these were associated with low enzyme activity. Furthermore, in HYE there was more biodiversity and a higher presence of plant-growth promoters, while in LYE there were more plant pathogenic organisms.

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“…O controle químico pode causar danos na microbiota benéfica das plantas, além de frequentemente deixar resíduos no ambiente (ETHUR et al, 2007) e nos alimentos.…”

Section: Aplicação De Microrganismos Endofíticos Em Controle Biológicunclassified

Aplicação de microrganismos endofíticos na agricultura e na produção de substâncias de interesse econômico

Santos

Varavallo

2011

Semin. Cienc. Biol. Saude

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Os microrganismos que vivem no interior de plantas e habitam de modo geral suas partes aéreas, como folhas e caules, mas não causam aparentemente nenhum dano a seus hospedeiros, são chamados de endofíticos. Além de exercerem diversas funções de importância para o hospedeiro, esses microrganismos são potencialmente úteis na agricultura e na indústria, sobretudo na farmacêutica e de defensivos agrícolas. Por se constituírem em potenciais substitutos de produtos químicos, ao exercerem ações de biocontrole e/ou promoção de crescimento de plantas, favorecendo a preservação do ambiente, vem sendo apontados como alternativa viável para sistemas de produção agrícola ecológica e economicamente sustentáveis. A obtenção de substâncias de interesse econômico, como enzimas, antibióticos e outros fármacos, a partir de microrganismos endofíticos, tem sido frequentemente relatada na literatura científica. Exemplo disso é o taxol, poderoso anticancerígeno que anteriormente era obtido apenas da exploração da planta Taxus brevifolia e, agora pode ser obtido de diferentes gêneros de fungos endofíticos. Avanços como este reforçam a grande potencialidade biotecnológica de tais microrganismos. Este trabalho visa apresentar um panorama sobre potenciais aplicações de microrganismos endofíticos na agricultura e na produção de substâncias de interesse econômico. Palavras-chave: Bactérias endofíticas. Controle biológico. Fungos endofíticos. Promoção de crescimento de plantas. Substâncias de interesse econômico. AbstractEndophytic microorganisms are mainly fungi and bacteria that live inside plants, generally inhabiting aerial parts such as leaves and stems, without causing any apparent damage to their hosts. In addition to many important functions for the host, the endophytic microorganisms are potentially useful in agriculture and industry, especially in pharmaceuticals and agrochemicals. By forming themselves into substitutes for chemicals by exercising stock biocontrol and/or promotion of plant growth, favoring the environmental preservation, has been appointed as a viable alternative agricultural production systems for environmentally and economically sustainable. Obtaining substances of economic interest, such as enzymes, antibiotics and other drugs from endophytic microorganisms has often been reported in the scientific literature. One example is taxol, a powerful anti-cancer substance that was previously obtained only from the exploitation of the plant Taxus brevifolia, and can now be obtained from different genera of endophytic fungi. Advances like this reinforce the great biotechnological potential of such microorganisms. This study presents an overview of potential applications of endophytic microorganisms in agriculture and production of substances of economic interest.

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Seleção de antagonistas fúngicos a Fusarium solani e Fusarium oxysporum em substrato comercial para mudas

Abstract: RESUMO

Cited by 6 publications

References 5 publications

Biotechnological prospecting of foliar endophytic fungi of guaco (Mikania glomerata Spreng.) with antibacterial and antagonistic activity against phytopathogens

Biotechnological prospecting of foliar endophytic fungi of guaco (Mikania glomerata Spreng.) with antibacterial and antagonistic activity against phytopathogens

Soil Health Check-Up of Conservation Agriculture Farming Systems in Brazil

Aplicação de microrganismos endofíticos na agricultura e na produção de substâncias de interesse econômico

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