Thermal response and horizontal transmission of cameroonian isolates of the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae – Candidates for microbial controls of the banana root borer Cosmopolites sordidus

Membang, Gertrude; Ambang, Zachée; Mahot, Hermine Claudine; Kuate, Apollin Fotso; Fiaboe, Komi K. M.; Hanna, Rachid

doi:10.1016/j.funeco.2021.101042

Cited by 17 publications

(9 citation statements)

References 44 publications

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“…1 , 2 ). This suggests that fungus might manipulate host physiology and behavior in ways that favor the fungal virulence 33 since its thermal thresholds are narrower than any of the insect hosts 12 , 13 , 34 . However, infection is costly, and insects redirect energy to immune function to battle it, leaving less energy available to face thermal challenges.…”

Section: Discussionmentioning

confidence: 99%

“…However, ET is relative to species-specific thermal physiology; therefore, differences in ET tolerance are expected between host and pathogens. For example, the lower and upper-thermal limits of Beauveria bassiana are 8 °C and 33 °C, respectively 12 , with an optimal range between 25 and 28 °C 13 , whereas adults of Acyrtociphon pisum have a minimum thermal limit of 10 °C and a minimum limit of 40 °C 14 . The counterparts for the predator beetle, Hippodamia convergens , are 6.5 °C and 50 °C, respectively 15 , 16 .…”

Section: Introductionmentioning

confidence: 99%

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Fungal infections lead to shifts in thermal tolerance and voluntary exposure to extreme temperatures in both prey and predator insects

Porras

Agudelo-Cantero

Santiago-Martínez

et al. 2021

Sci Rep

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Pathogens can modify many aspects of host behavior or physiology with cascading impacts across trophic levels in terrestrial food webs. These changes include thermal tolerance of hosts, however the effects of fungal infections on thermal tolerances and behavioral responses to extreme temperatures (ET) across trophic levels have rarely been studied. We examined how a fungal pathogen, Beauveria bassiana, affects upper and lower thermal tolerance, and behavior of an herbivorous insect, Acyrthosiphon pisum, and its predator beetle, Hippodamia convergens. We compared changes in thermal tolerance limits (CTMin and CTMax), thermal boldness (voluntary exposure to ET), energetic cost (ATP) posed by each response (thermal tolerance and boldness) between healthy insects and insects infected with two fungal loads. Fungal infection reduced CTMax of both aphids and beetles, as well as CTMin of beetles. Fungal infection modified the tendency, or boldness, of aphids and predator beetles to cross either warm or cold ET zones (ETZ). ATP levels increased with pathogen infection in both insect species, and the highest ATP levels were found in individuals that crossed cold ETZ. Fungal infection narrowed the thermal tolerance range and inhibited thermal boldness behaviors to cross ET. As environmental temperatures rise, response to thermal stress will be asymmetric among members of a food web at different trophic levels, which may have implications for predator–prey interactions, food web structures, and species distributions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fungal infections lead to shifts in thermal tolerance and voluntary exposure to extreme temperatures in both prey and predator insects

Porras

Agudelo-Cantero

Santiago-Martínez

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…1-2). This suggests that fungus might manipulate host physiology and behavior in ways that favor the fungal virulence [24] since its thermal thresholds are narrower than any of the insect hosts [11,12,25]. However, infection is costly, and insects redirect energy to immune function to battle it.…”

Section: Discussionmentioning

confidence: 99%

“…Differences in ET between host and pathogens are expected. For example, the thermal limits of B. bassiana growth are between 8°C and 33 °C [11], with an optimal range between 25 °C and 28°C [12], whereas adults of A. pisum display 10°C lower and 40°C upper tolerance [13], and the counterparts for the predator beetle are 6.5 °C and 50 °C [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fungal Infections Lead to Shifts in Thermal Tolerance and Voluntary Exposure to Extreme Temperatures in Both Prey and Predator Insects

Porras

Agudelo-Cantero

Santiago

et al. 2021

Preprint

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Pathogens can alter the thermal tolerances of insects; these changes can have cascading impacts across trophic levels in terrestrial food webs. However, the effects of fungal infections on thermal tolerances and behavioral responses to extreme temperatures (ET) across trophic levels have rarely been studied. We examined how a fungal pathogen, Beauveria bassiana, affects the thermal physiology and behavior of an herbivorous insect, Acyrthosiphon pisum, and a predator beetle, Hippodamia convergens. We compared thermal tolerance limits (CTMin and CTMax), thermal boldness (voluntary exposure to ET), energetic cost (ATP) posed by each response (thermal tolerance and boldness) between healthy and infected insects with two fungal loads. Results showed that fungal infection reduced upper thermal tolerance (CTMax) of aphids and beetles, as well as lower thermal tolerance (CTMin) of beetles. CTMin of aphids was not altered by infection. Healthy aphids and beetles crossed warm ET zones (ETZ). Fungal infection modified the tendency, or boldness, of aphids and predator beetles to either cross warm or cold ETZ. ATP levels increased with pathogen infection in insect species, and the highest ATP levels were found in individuals that crossed cold ETZ. Fungal infection narrows the thermal tolerance range and inhibited thermal boldness behaviors to cross ET which may have implications for predator-pay interactions, food web structures, and species distributions. As environmental temperature rises, response to thermal stress will be asymmetric among members of a food web at different trophic levels.

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“…The entomopathogenic fungus Beauveria bassiana (Hypocreales: Cordycipitaceae) has been widely investigated and tested under laboratory 2,14,15 and field 16,17,18 conditions against adults of C. sordidus . Although less common, studies on Metarhizium anisopliae (Hypocreales: Clavicipitaceae) also indicate the potential of this fungus as a lethal pathogen of banana weevils 19,20,21 . However, a great diversity of entomopathogenic fungal species seems to be naturally associated with this host.…”

Section: Introductionmentioning

confidence: 99%

Natural occurrence of Beauveria caledonica, pathogenicity to Cosmopolites sordidus and antifungal activity against Fusarium oxysporum f. sp. cubense

Mascarin

Marinho-Prado

Assalin

et al. 2022

Pest Management Science

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BACKGROUND: Entomopathogenic fungi can provide a set of ecological services, such as suppressing arthropod pests and plant pathogens. In this study, novel indigenous Beauveria caledonica (Bc) strains were isolated from naturally infected banana weevils (Cosmopolites sordidus) occurring in commercial banana plantations in Brazil.RESULTS: The prevalence of infection by Bc strains on field-caught C. sordidus ranged from 1.3% to 12.9%. Similar to the Beauveria bassiana strains tested, none of the Bc strains caused more than 50% weevil mortality at a concentration of 1 × 10 8 conidia ml −1 . Bc strain CMAA1810 caused the highest mortality in C. sordidus and had enhanced insecticidal activity when formulated with an emulsifiable oil. In paired co-culture assays, this same strain showed a significant growth-inhibitory effect on the causal agent of Fusarium banana wilt (Fusarium oxysporum f. sp. cubense, Foc) of twofold magnitude compared with the control. Cell-free crude filtrates derived from the red-pigmented culture broth of Bc (CMAA1810) strongly reduced Foc conidial viability, and this inhibitory activity was inversely related to the age of the Bc culture. Crude concentrated filtrates from 4-dayold cultures exhibited the strongest antifungal activity (13-fold) compared with untreated Foc conidia. The abundant compound identified in the crude filtrate of Bc was oosporein (1,4-dibenzoquinone) present at a concentration of 0.829 ± 0.018 mg g −1 dry matter, and the antifungal activity of the filtrate was demonstrated.CONCLUSION: These results indicated that Bc strains might have the potential to manage both C. sordidus and Foc, two of the major phytosanitary problems in banana crops worldwide. Further research under field conditions using suitable formulations of virulent Bc strains in combination with the metabolite oosporein is needed to evaluate their efficacy in the management of C. sordidus and Foc in banana plantations.

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Thermal response and horizontal transmission of cameroonian isolates of the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae – Candidates for microbial controls of the banana root borer Cosmopolites sordidus

Cited by 17 publications

References 44 publications

Fungal infections lead to shifts in thermal tolerance and voluntary exposure to extreme temperatures in both prey and predator insects

Fungal infections lead to shifts in thermal tolerance and voluntary exposure to extreme temperatures in both prey and predator insects

Fungal Infections Lead to Shifts in Thermal Tolerance and Voluntary Exposure to Extreme Temperatures in Both Prey and Predator Insects

Natural occurrence of Beauveria caledonica, pathogenicity to Cosmopolites sordidus and antifungal activity against Fusarium oxysporum f. sp. cubense

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