Oxidative Stress in Entomopathogenic Fungi and Its Potential Role on Mycoinsecticide Enhancement

Huarte‐Bonnet, Carla; Mannino, M. Constanza; Pedrini, Nicolás

doi:10.1007/978-3-030-23045-6_7

Cited by 3 publications

(2 citation statements)

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“…7,20 It is welldocumented that UV-B radiation acts directly on DNA, RNA, and intracellular macromolecules (proteins, ribosomes, and biomembranes), and the development of compounds such as the reactive oxygen species (ROS) resulting in genetic modifications, cell toxicity, and signal pathway modification. 7,[21][22][23][24] EPF have developed several adaptation mechanisms against UV-B radiation to protect their cellular structures from damage caused, such as the production of protective pigments (i.e., melanin), antioxidant enzymes (i.e., catalases, superoxide dismutases), and resistant structures (i.e., microsclerotia). 25,26 To improve fungal persistence in the field, night-time application and/or the addition of photoprotectors to formulated EPF products have been applied, with partial success.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most harmful environmental factors affecting the depletion of EPF propagules is the sunlight fraction UV‐B radiation (λ of 280–315 nm), which could directly affect the presence and persistence of EPF conidia in epigeal habitats 7,20 . It is well‐documented that UV‐B radiation acts directly on DNA, RNA, and intracellular macromolecules (proteins, ribosomes, and biomembranes), and the development of compounds such as the reactive oxygen species (ROS) resulting in genetic modifications, cell toxicity, and signal pathway modification 7,21–24 …”

Section: Introductionmentioning

confidence: 99%

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Imperfect match between radiation exposure times required for conidial viability loss and infective capacity reduction attenuate UV‐B impact on Beauveria bassiana

Fernández‐Bravo,

Bonnet,

Quesada‐Moraga

et al. 2023

Pest Management Science

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BackgroundUV‐B radiation represents a significant challenge for the widespread use of entomopathogenic fungi in pest management. This study focused on the research of the asynchronous response between virulence and conidial viability against Ceratitis capitata adults using specific statistical models. Moreover, it was also investigated whether the observed differences in susceptibility to UV‐B radiation in in vitro assays among three selected isolates of Beauveria bassiana were reflected in the above‐mentioned asynchrony.ResultsWhile the irradiation of the three isolates of B. bassiana was associated with a significant loss of conidial viability, their virulence was not significantly affected compared to the non‐irradiated treatments when exposed to 1200 mW m‐2 for 6 hours before or after the inoculation of C. capitata. In fact, the irradiation time needed to reduce the mortality to 50% compared to the controls was 34.69 hours for EABb 10/225‐Fil, 16.36 hours for EABb 09/20‐Fil, and 24.59 hours for EABb 09/28‐Fil. Meanwhile, the irradiation time necessary to reduce conidial viability to 50% was 9.89 hours for EABb 10/225‐Fil, 8.74 hours for EABb 09/20‐Fil, and 4.71 hours for EABb 09/28‐Fil.ConclusionThese results highlight the importance of modeling the response of entomopathogenic fungi virulence and conidial susceptibility when exposed to UV‐B radiation for the selection of environmentally competent isolates, regardless of the results obtained in previous in vitro assays on conidial germination. This strategic approach is critical in overcoming the challenges posed by UV‐B radiation and holds the key to realizing the full potential of entomopathogenic fungi in pest management.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Imperfect match between radiation exposure times required for conidial viability loss and infective capacity reduction attenuate UV‐B impact on Beauveria bassiana

Fernández‐Bravo,

Bonnet,

Quesada‐Moraga

et al. 2023

Pest Management Science

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The Potential Application of Entomopathogenic Fungi (EF) in Insect Pest Management

Mishra

2023

Microorganisms for Sustainability

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Key role of environmental competence in successful use of entomopathogenic fungi in microbial pest control

Quesada‐Moraga¹,

González-Mas²,

Yousef-Yousef³

et al. 2023

J Pest Sci

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One of the main negative effects of climate change on biological pest control is alteration of relationships between insect pests and their natural enemies (both entomophagous and entomopathogenic). Indeed, environmental conditions can have multiple effects on pest control success when using entomopathogenic fungi (EPF), where conidial depletion, inactivation, and loss in virulence and infectivity can all occur. Appropriate mass production and formulation strategies for EPF can partially solve these problems. However, the only strategy to guarantee high virulence and infectivity is selection of environmentally competent fungal strains that are able to persist in the host environment for the required infection period. This review examines the criteria for selection of environmentally competent EPF. While UV radiation, followed by humidity and temperature, is probably the most important propagule depletion and inactivation factors in epigeal habitats, temperature is most critical for reducing the infectivity and virulence of EPF in epigeal and hypogeal habitats. In addition, geographical origin and other biotic and abiotic factors have an important impact which may guarantee the environmental competence of selected entomopathogenic fungal strains and, therefore, farmer willingness to replace chemicals with mycoinsecticides. To achieve this, it is urgent to promote the development of microbial control solutions adapted to relatively uniform climatic zones through more simplified, targeted, and less costly EPF approval and authorization.

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Oxidative Stress in Entomopathogenic Fungi and Its Potential Role on Mycoinsecticide Enhancement

Cited by 3 publications

References 50 publications

Imperfect match between radiation exposure times required for conidial viability loss and infective capacity reduction attenuate UV‐B impact on Beauveria bassiana

Imperfect match between radiation exposure times required for conidial viability loss and infective capacity reduction attenuate UV‐B impact on Beauveria bassiana

The Potential Application of Entomopathogenic Fungi (EF) in Insect Pest Management

Key role of environmental competence in successful use of entomopathogenic fungi in microbial pest control

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