Pathogenic ability and saline stress tolerance of two Fusarium isolates from Odontesthes bonariensis eggs

Marino, Suani Giovanna Pacheco; Cabello, Marta Noemí; Dinolfo, María Inés; Stenglein, Sebastián Alberto; Saparrat, Mario Carlos Nazareno; Salibián, Alfredo

doi:10.1016/j.riam.2015.02.005

Cited by 3 publications

(3 citation statements)

References 37 publications

(51 reference statements)

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“…Regarding salinity, there was a reduction in isolate growth with increasing NaCl concentrations in the growing medium. In a previous study carried out by Pacheco Marino et al (2016), the same in vitro growth reduction trend was verified in different NaCl concentrations for two Fusarium isolates within the FIESC and FSSC complex. Salt stress is one of the main environmental restrictions in semi‐arid regions where cucurbits are grown, such as northeastern Brazil (Cavalcante et al, 2020).…”

Section: Discussionsupporting

confidence: 67%

“…Salt stress is one of the main environmental restrictions in semi-arid regions where cucurbits are grown, such as northeastern Brazil (Cavalcante et al, 2020). The increase in salinity can have a direct response on the vegetative structure (mycelium) of the fungus, causing osmotic stress or acting as a toxic component, interfering with the stability of the membranes and/or enzymatic activity of the fungus (Adler, 1996;Pacheco Marino et al, 2016).…”

Section: Ta B L Ementioning

confidence: 99%

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Effect of environmental factors, fungicide sensitivity, and pathogenicity of Fusarium spp. associated with fruit rot of melon

Maniçoba

Negreiros

Cavalcante

et al. 2023

Journal of Phytopathology

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Fusarium rot is one of the main postharvest diseases of melons, directly interfering with the quality and commercial use of the fruit. The purpose of this study was to assess the effect of environmental factors (temperature, pH and salinity) and the pathogenicity of four Fusarium species (F. falciforme, F. kalimantanense, F. pernambucanum and F. sulawesiense) belonging to three different species complexes on disease development on melon, as well as the in vitro and in vivo sensitivity of these species to the fungicides azoxystrobin + fludioxonil, imazalil and thiabendazole. The results showed optimum fungal growth temperatures from 24.5 to 27.2°C, and optimum pH from 6.10 to 8.37 for all Fusarium species. NaCl concentrations (250–1000 mM) significantly reduced in vitro mycelial growth for all isolates. All species were pathogenic to melon plants and fruit, with an isolate of F. falciforme being the most aggressive, causing the highest disease severity in plants and fruit (43.3% and 62.5%, respectively). The isolate of F. sulawesiense tested showed high in vitro sensitivity to two fungicides (azoxystrobin + fludioxonil and imazalil), with EC50 values below 1 mg/L of a.i. Fruit inoculated with the selected isolates of F. falciforme and F. pernambucanum showed a reduction in the disease severity on the peduncle when treated with the fungicide thiabendazole (9.0% and 4.0%, respectively). Azoxystrobin + fludioxonil was responsible for the lowest disease severity in the epicarp caused by the same isolates (0.0% and 2.5%, respectively). These results are relevant to improve management strategies for diseases of melon caused by Fusarium spp.

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Section: Discussionsupporting

confidence: 67%

Section: Ta B L Ementioning

confidence: 99%

Effect of environmental factors, fungicide sensitivity, and pathogenicity of Fusarium spp. associated with fruit rot of melon

Maniçoba

Negreiros

Cavalcante

et al. 2023

Journal of Phytopathology

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“…The inhibition rate was expressed as the percentage reduction of fungal growth compared to the control plates, were each fungal strain was grown on Potato Dextrose Agar (pH 5.5). The percentage of reduction was calculated according to Pacheco Marino et al [21], using the following formula:…”

Section: Fungal Growth Inhibitionmentioning

confidence: 99%

In vitro effect of salinity and pH on Fusarium sp., the causal agent of sweet-potato root rot

Barbu¹,

Secoia²

2021

RJEEC

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Fusarium root rot in a common pathogen of sweet potato, with a wide range of host plants. In the current study six new isolates of Fusarium sp., collected from infected sweet potato plants, along with a reference strain of Fusarium oxysporum, had their growth behavior studied in various pH and saline conditions. In vitro studies showed that salinity higher than 6% NaCl in the PDA substrate significantly reduces the fungal growth. At 12% NaCl, four of seven strains revealed complete mycelia inhibition. However, for the other two isolates, and for the reference strain, 12% salinity only reduced the growth with 77.4%. Regarding the fungal growth at different pH values, it was noticed that tested fusaria were not perturbed at up to 8.5 alkalinity. However, at a pH of 4.5, the growth rate was reduced, although the growth differences were diminished during prolonged incubation time. Considering the in vitro results, saline water should be tested as preventive immersion treatment on the sweet potato sprouts, before their planting, in order to reduce the incidence of Fusarium infection.

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Fusarium equiseti LPSC 1166 and its in vitro role in the decay of Heterostachys ritteriana leaf litter

Franco

Troncozo²,

Baez

et al. 2017

Folia Microbiol

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The role of microorganisms in litter degradation in arid and semi-arid zones, where soil and water salinization is one of the main factors limiting carbon turnover and decay, remains obscure. Heterostachys ritteriana (Amaranthaceae), a halophyte shrub growing in arid environments such as "Salinas Grandes" (Córdoba, Argentina), appears to be the main source of organic matter in the area. Little is known regarding the microorganisms associated with H. ritteriana, although they are a potential source of enzymes such as cellulolytic ones, which might be important in biotechnological fields such as bioethanol production using ionic liquids. In the present study, by studying the microbiota growing on H. ritteriana leaf litter in "Salinas Grandes," we isolated the cellulolytic fungus Fusarium equiseti LPSC 1166, which grew and degraded leaf litter under salt stress. The growth of this fungus was a function of the C substrate and the presence of NaCl. Although in vitro the fungus used both soluble and polymeric compounds from H. ritteriana litter and synthesized extracellular β-1,4 endoglucanases, its activity was reduced by 10% NaCl. Based on these results, F. equiseti LPSC 1166 can be described as a halotolerant cellulolytic fungus most probably playing a key role in the decay of H. ritteriana leaf litter in "Salinas Grandes."

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Pathogenic ability and saline stress tolerance of two Fusarium isolates from Odontesthes bonariensis eggs

Abstract: The isolates LPSC 1001 (FIESC) and 1002 (FSSC) were identified as fungal pathogens to O. bonariensis eggs. The use of NaCl solutions as antifungal treatment was not effective to control the infection with these strains.

Cited by 3 publications

References 37 publications

Effect of environmental factors, fungicide sensitivity, and pathogenicity of Fusarium spp. associated with fruit rot of melon

Effect of environmental factors, fungicide sensitivity, and pathogenicity of Fusarium spp. associated with fruit rot of melon

In vitro effect of salinity and pH on Fusarium sp., the causal agent of sweet-potato root rot

Fusarium equiseti LPSC 1166 and its in vitro role in the decay of Heterostachys ritteriana leaf litter

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