Seleção de fungicidas visando à preservação de fungos micorrízicos arbusculares nativos no cultivo do feijoeiro

Campos, Amália Aparecida Busoni; Scotton, Juliana Cristina; Costa, Wesley Luiz Fialho; Giassi, Valdionei; Pinto, Diego Fontebasso Pelizari; Homma, Sérgio Kenji

doi:10.1590/1807-1929/agriambi.v19n9p898-902

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…Moreover, root colonization and enzymatic activity of Funneliformis coronatum associated with maize plants was also inhibited, demonstrating the fungicidal activity of this strobilurin, probably on the respiratory electron transfer within mitochondria, where succinate dehydrogenase is part of complex II ( Diedhiou et al, 2004 ). Interestingly, foliar application of azoxystrobin did not impact AM fungal root colonization ( Diedhiou et al, 2004 ; Hernández-Dorrego and Mestre-Parés, 2010 ; Campos et al, 2015 ). A similar trend was observed with kresoxim-methyl, another strobilurin fungicide ( Diedhiou et al, 2004 ).…”

Section: Discussionmentioning

confidence: 99%

Fungicides With Contrasting Mode of Action Differentially Affect Hyphal Healing Mechanism in Gigaspora sp. and Rhizophagus irregularis

et al. 2021

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Fungicides are widely used in conventional agriculture to control fungal diseases, but may also affect non-target microorganisms such as arbuscular mycorrhizal (AM) fungi. These root symbionts develop extended mycelial networks within the soil via mechanisms such as anastomosis that indistinctly concerns intact and damaged hyphae, the latter being named hyphal healing mechanism (HHM). The HHM differs between Glomeraceae and Gigasporaceae. However, the effects of fungicides on this mechanism in unknown. Here, the impact of azoxystrobin, pencycuron, flutolanil, and fenpropimorph at 0.02 and 2 mg L–1 were tested in vitro on the HHM of Gigaspora sp. MUCL 52331 and Rhizophagus irregularis MUCL 41833, and repair events visualized carefully under a dissecting bright-field light microscope. Azoxystrobin was the more detrimental for both AM fungi at 2 mg L–1, while fenpropimorph impacted only R. irregularis (stimulating at low and inhibiting at high concentration). Conversely, flutolanil and pencycuron did not impact any of the two AM fungi. The mechanisms involved remains to be elucidated, but perturbation in the still-to-be firmly demonstrated spitzenkörper or in sterols content as well as a process of hormesis are possible avenues that deserve to be explored in view of a rationale management of chemicals to control fungal pathogens without harming the beneficial AM fungi.

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Section: Discussionmentioning

confidence: 99%

Fungicides With Contrasting Mode of Action Differentially Affect Hyphal Healing Mechanism in Gigaspora sp. and Rhizophagus irregularis

et al. 2021

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“…These organisms are mostly mycophagous, consuming any kind of fungi, lichens, bacteria and organic material available in the environment (SEGAT et al, 2018). Under environmental conditions, the application of fungicides affects many organisms, including bacteria, fungi, yeasts and arbuscular mycorrhizal fungi, which can serve as a source of food for springtails (JANSA; WIEM-KEN; FROSSARD, 2006;BENDING;RODRÍGUEZ-CRUZ;LINCOLN, 2007;CAMPOS et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Effect of toxicity in Folsomia candida by the use of fungicide and insecticide in subtropical soil

Giordani

Busatta

Bonfim

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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Os agrotóxicos são amplamente utilizados para o controle e a prevenção de pragas e doenças agrícolas. O uso desses produtos é capaz de afetar de maneira negativa organismos não alvos de papel significante no solo, como os colêmbolos. O presente estudo teve como objetivo avaliar a toxicidade de duas formulações comerciais na fauna do solo utilizando o colêmbolo Folsomia candida. Foi utilizado um solo natural classificado como Cambissolo Húmico, característico da região oeste do Estado de Santa Catarina. Os tratamentos nos dois testes consistiram em seis concentrações do fungicida Comet® (i.a. piraclostrobina) (0,35; 0,70; 1,40; 2,10; 2,80 e 4,00 mg kg-1 de solo) e do fungicida + inseticida Standak®Top (p.a. piraclostrobina + tiofanato metílico + fipronil) (0,20; 0,60; 1,20; 1,80; 2,40 e 3,00 mg kg-1 de solo), acrescidosdo tratamento controle. Testes agudos e crônicos foram realizados de acordo com protocolos ISO. Ambos os produtos demonstraram ser tóxicos para a espécie avaliada. Efeitos de letalidade foram observados em relação ao controle dos organismos expostos em baixas concentrações do fungicida (0,35 mg kg-1 solo), enquanto para a formulação do fungicida + inseticida a letalidade foi observada em concentrações mais altas, a partir de 2,40 mg kg-1 solo (CL50 > 3,00 mg kg-1 solo). A taxa de reprodução foi afetada somente nos organismos expostos ao fungicida, com redução no número de juvenis em concentração a partir de 4,00 mg kg-1 solo, com CE20 estimado de 3,38 mg kg-1 solo (2,79–3,96). Os resultados obtidos indicam que os colêmbolos apresentam sensibilidade aos produtos testados, especialmente ao fungicida que contém maior concentração de piraclostrobina em sua composição.

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“…Moreover, chemical fungicides can also affect root colonization by AMF as well as the number of spores [5]. Fertilization regimes have impacts on maize root-associated AMF community [6].…”

Section: Introductionmentioning

confidence: 99%

Arbuscular Micorrizal Fungi and Farm Management Practices

Correa¹

2019

WJASS

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Arbuscular mycorrhizal fungi (AMF) are commonly present in most tropical land ecosystems; however, high rates of fertilization can disrupt their life cycle. The AMF occurrence in different crop systems compared to native vegetation in tropical conditions is not well understood. With the aim to analyze potentially benefic symbionts for crop production in an experimental farm, the AMF community structure along different crop cultivation was investigated. Soil subsamples were used to inoculate trap cultures using Sorghum sp. as host. The preserved unfertilized area showed a greater diversity of AMF, followed by the grassland and sugarcane. Number of AMF spores was also greater in the preserved area (47 spores per 100g soil) than the numbers estimated for other sites. Nine AMF genera of Glomeromycotina (spores) and 16 AMF species were observed in the native forest. The natural richness appears to be favored when Sugarcane or grasses are planted; however, the preserved native forest showed unique characteristics. Soils under native forest stored higher amount of SOM, presented higher macro-aggregates and preserved more charcoal than the samples of permanent grassland or under maize. The maize associated AMF community diverged from grassland, as described by the principal component analysis. This study showed differences in AMF communities from cultivated plots compared to native vegetation as well as potential for inoculant formulation for economically crops.

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Seleção de fungicidas visando à preservação de fungos micorrízicos arbusculares nativos no cultivo do feijoeiro

Cited by 10 publications

References 15 publications

Fungicides With Contrasting Mode of Action Differentially Affect Hyphal Healing Mechanism in Gigaspora sp. and Rhizophagus irregularis

Fungicides With Contrasting Mode of Action Differentially Affect Hyphal Healing Mechanism in Gigaspora sp. and Rhizophagus irregularis

Effect of toxicity in Folsomia candida by the use of fungicide and insecticide in subtropical soil

Arbuscular Micorrizal Fungi and Farm Management Practices

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