Effects of increasing concentrations of fungicide QuadrisR on bacterial functional profiling in loamy sand soil

Aleksova, Michaella; Kenarova, Anelia; Boteva, Silvena; Georgieva, Stela; Chanev, Christo; Radeva, Galina

doi:10.1007/s00203-021-02423-2

Cited by 6 publications

(5 citation statements)

References 42 publications

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“…The CSs with low availability were more strongly impacted in comparison to the CSs with medium and high availability. Such phenomenon of very high stimulation of the utilization of the CSs with low availability was also detected in our earlier study [16] of soil treated with fungicide Quadris R , assuming common bacterial responses to anthropogenic stress independently of its origin. Additionally, in this case the recorded impact was expressed both to the share of the affected carbon sources from the respective group of bioavailability and to the level of the impact.…”

supporting

confidence: 79%

Application of Biolog Ecoplate™ Technique for Assessing the Effects of Macrophyte Harvesting on Aquatic Bacterial Communities

Boteva,

Stanachkova,

Traykov

et al. 2024

C. R. Acad. Bulg. Sci.

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Macrophyte overgrowth in freshwater ecosystems is a worldwide problem, and a common management practice for these ecosystems is to remove the aquatic vegetation. In the study, the short-term effects of macrophyte harvesting in a mountain lake (Trevnoto Lake, Bulgaria) on both bacterial metabolic activity and fingerprints were assessed using Biolog Ecoplate™ assay. Bacterial responses to human activity were manifested by: 1) increased bacterial metabolic activity by 15%, and 2) shifts in bacterial metabolic fingerprints. The most affected carbon sources were those with low availability for aquatic bacteria – 85% of them were influenced and the rates of their utilizations changed from a decrease of 96% to an increase of 681%. In general, a clear trend was formed that the greater the bioavailability of the carbon sources, the less susceptible is their utilization to the environmental change. This preliminary study indicates an immediate impact of macrophyte harvesting on lake bacteria. In this aspect, Biolog Ecoplate™ assay could be useful in lake monitoring programmes in order to develop better sustainable management practices for restoration.

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supporting

confidence: 79%

Application of Biolog Ecoplate™ Technique for Assessing the Effects of Macrophyte Harvesting on Aquatic Bacterial Communities

Boteva,

Stanachkova,

Traykov

et al. 2024

C. R. Acad. Bulg. Sci.

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“…The 1A). Detailed temporal dynamics of soil metrics were given in Aleksova et al (2021). Over time, Az soil residues decreased in an inverse relationship with the applied fungicide concentrations (Figure 1B).…”

Section: Resultsmentioning

confidence: 97%

“…Gas chromatography was used to determine the concentrations of Az soil residues on experimental days. Detailed Az extraction procedure and gas chromatography settings were described in Aleksova et al (2021).…”

Section: Methodsmentioning

confidence: 99%

Soil enzyme activities after application of fungicide Quadris<sup>R</sup> at increasing concentration rates

Boteva¹,

Kenarova²,

Michaella³

et al. 2022

PLANT SOIL ENVIRON

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The study aimed to assess the effects of fungicide QuadrisR on activities of soil enzymes contributed to soil nutrient turnover. A batch laboratory experiment with QuadrisR-amended (0 mg/kg ds (dry soil) – 35.00 mg/kg ds) loamy sand soil was conducted, and shifts in soil physical environments and enzyme activities (beta-glucosidase, urease, acid and alkaline phosphatases, arylsulfatase and dehydrogenase) were evaluated on experimental days 1, 30, 60, 90 and 120. The results indicated that QuadrisR changed both soil properties and enzyme activities. The most sensitive environmental parameter to fungicide input was soil pH. The most suscaptable to QuadrisR enzymes were dehydrogenase and arylsulfatase, and the most resistant – urease. The mean overall dehydrogenase activity decreased by 33%, whereas the profile of arylsulfatase activity tended to permanent decrease over time. The general pattern of enzyme responses to QuadrisR was an immediate-early (days 1 – 30) decline of enzyme activities after fungicide application, except that of arylsulfatase. Beta-glucosidase manifested a temporal profile of steady-state stimulation under the lowest (2.90 mg/kg ds) and low sensitivity to the higher (14.65 mg/kg ds and 35.00 mg/kg ds) fungicide concentrations.

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“…However, fenhexamid showed inhibition indices between 2 and 30% at the same concentrations ( Table 3 ). Generally, the most frequently recommended field concentration of fungicides is between 3 and 35 μg ml −1 (Abdoon et al, 2011 ; Aleksova et al, 2021 ). The two chemical fungicides used in this study exhibited inhibition indices of <50% in mycelial growth at 20 μg ml −1 .…”

Section: Resultsmentioning

confidence: 99%

Biological Control and Plant Growth Promotion Properties of Volatile Organic Compound-Producing Antagonistic Trichoderma spp.

Joo

Hussein

2022

Front. Plant Sci.

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Trichoderma is environmentally vital due to their plant growth-promoting effects (such as enhancement of nutrients supply, suppression of plant pathogens, and promotion of plant defense). Biogenic volatile organic compounds (VOCs) are diverse chemical substances emitted by Trichoderma spp. The potential role of VOCs in biological control and plant growth promotion has recently been recognized. Here, the Trichoderma-VOCs' performance for plant growth promotion and suppression of plant pathogens are evaluated. We further investigated VOC emission profiles of T. harzianum using GC–MS. The Trichoderma-VOCs exhibited significant (p < 0.05) antifungal properties against all tested pathogenic fungi. T. atroviride-VOCs showed a decisive inhibition of Alternaria panax, Botrytis cinerea, Cylindrocarpon destructans, and Sclerotinia nivalis. The germinating seeds demonstrated growth enhancement in the presence of Trichoderma-VOCs emitted by different strains. Low levels of cyclopentasiloxane, decamethyl, cyclotetrasiloxane, and octamethyl were found in T. harzianum KNU1 strain whereas cyclopentasiloxane, decamethyl, cyclotetrasiloxane, and octamethyl showed higher emission levels as Si-containing compounds. The results reveal the potentiality of VOCs as a biocontrol resource against deleterious rhizosphere microorganisms and underline the importance of Trichoderma-VOCs emissions in regulating plant growth and development.

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Effects of increasing concentrations of fungicide QuadrisR on bacterial functional profiling in loamy sand soil

Cited by 6 publications

References 42 publications

Application of Biolog Ecoplate™ Technique for Assessing the Effects of Macrophyte Harvesting on Aquatic Bacterial Communities

Application of Biolog Ecoplate™ Technique for Assessing the Effects of Macrophyte Harvesting on Aquatic Bacterial Communities

Soil enzyme activities after application of fungicide Quadris<sup>R</sup> at increasing concentration rates

Biological Control and Plant Growth Promotion Properties of Volatile Organic Compound-Producing Antagonistic Trichoderma spp.

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