Antagonistic Activity of Pseudohalonectria and Ophioceras

Asthana, A.; Shearer, Carol A.

doi:10.2307/3760044

Cited by 7 publications

(5 citation statements)

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“…In this study, woody substrates colonized by P. lignicola had no other fungi recorded (Tsui, unpublished data). This finding may support the inhibitory and competitive activities of P. lignicola reported in other investigations (Asthana and Shearer 1990;Yuen et al 1999b). Pseudohalonectria spp., particularly P. lignicola, are inhibitory to other freshwater fungi (Asthana and Shearer 1990), with good evidence from both cultural and field competition studies (Asthana and Shearer 1990).…”

Section: Resultssupporting

confidence: 85%

“…This finding may support the inhibitory and competitive activities of P. lignicola reported in other investigations (Asthana and Shearer 1990;Yuen et al 1999b). Pseudohalonectria spp., particularly P. lignicola, are inhibitory to other freshwater fungi (Asthana and Shearer 1990), with good evidence from both cultural and field competition studies (Asthana and Shearer 1990). In addition, species of Chaetosphaeria, Pseudohalonectria, and Ophioceras were found to be competitive in defending the colonized substrata against invading species when precolonized wood blocks were submerged in a river for 3 months and then retrieved (Fryar et al 2001).…”

Section: Resultssupporting

confidence: 85%

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Fungi on submerged wood in the Koito River, Japan

2003

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Woody substrates were collected from the Koito River in Japan, and the biodiversity of fungi on these substrates was investigated. Twenty-eight species were identified, comprising 12 ascomycete and 16 anamorphic taxa. The common fungi included Chaetosphaeria sp., Ophioceras commune, Pseudohalonectria lignicola, and Savoryella lignicola. The occurrence of fungi on submerged wood is discussed, and three interesting taxa -Pseudohalonectria lignicola, Bactrodesmium arnaudii, and B. pallidum -are described and illustrated.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 85%

Fungi on submerged wood in the Koito River, Japan

2003

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“…The measurement of colony growth was stopped when the edges of the Petri dish were reached by the mycelium or, in the case of slow-growing fungi, 17 days after inoculation. The fungal growth rate was classified as slow (0–1 mm d -1 ), moderate (1–3 mm d -1 ) or fast (3–6 mm d -1 ) [ 30 ].…”

Section: Methodsmentioning

confidence: 99%

“…The second quantitative measure was the percentage of resistance; this percentage represented the overall ability of a given species to grow and to resist the presence of other fungi. It was determined by adding the growth percentages of a given species in all dual assays with other fungal species and comparing the resulting percentage to its growth in isolation [ 30 ]. The resistance percentages were determined as follows:…”

Section: Methodsmentioning

confidence: 99%

Interactions between abundant fungal species influence the fungal community assemblage on limestone

Morón‐Ríos¹,

Gómez‐Cornelio²,

Ortega-Morales³

et al. 2017

PLoS ONE

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The assembly of fungal communities on stone materials is mainly influenced by the differential bioreceptivity of such materials and environmental conditions. However, little is known about the role of fungal interactions in the colonization and establishment of fungal species. We analyzed the effects of intra- and interspecific interactions between 11 species of fungi in oligotrophic and copiotrophic media and on limestone coupons. In a previous study, these species were the most frequently isolated in the epilithic biofilms of limestone walls exposed to a subtropical climate. In the culture media, we found a greater frequency of intra- and interspecific inhibitory effects in the oligotrophic medium than in the copiotrophic medium. On the limestone coupons, all fungi were able to establish; however, the colonization success rate varied significantly. Cladosporium cladosporioides had a less extensive colonization in isolation (control) than in dual interactions (coexistence) with other species. Phoma eupyrena exhibited the highest colonization success rate and competitive dominance among all tested species. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses revealed that Pestalotiopsis maculans and Paraconiothyrium sp. produced calcium oxalate crystals during their growth on coupon surfaces, both in isolation and in dual interactions. Our results demonstrate that interactions between abundant fungal species influence the fungal colonization on substrates, the biomineralization and the fungal community assemblage growing in limestone biofilms.

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“…Fungal growth (area) was determined through image analysis using the software IMAGEJ 1.52a [29]. The quantitative assessment of interactions was scored by calculating the Percent Inhibition Index (PII, Equation (1)) [30], and the Overall Antagonism Index (OAI or resistance estimate, Equation (2)) [31]. The PII denotes growth differences in mono-cultures in relation to co-cultures, whereas the OAI represents the overall ability of a given species to grow and to resist the presence of other fungi.…”

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confidence: 99%

Experimental Analysis of Interactions Among Saprotrophic Fungi from A Phosphorous-Poor Desert Oasis in the Chihuahuan Desert

et al. 2020

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Fungal ecological interactions play a key role in structuring community assemblages. These associations may involve both antagonistic and synergistic relationships, which are commonly influenced by abiotic factors such as nutrient conditions. However, information for extreme, oligotrophic systems remain poor. Herein, interactions among key members of the aquatic transient fungal community (Aspergillus niger, Cladosporium sp., and Coprinellus micaceus) of a low-nutrient freshwater system in the Cuatro Ci enegas Basin, Mexico were studied. Pairwise interaction bioassays were explored in vitro under different nutrient conditions, including carbohydrates-rich, carbohydrates and amino peptides-rich, and low nutrients. Our results indicated that antagonistic patterns prevail among the studied taxa. However, nutrient-dependent changes were observed in Cladosporium sp. shifting to synergy under carbohydrates-rich conditions, suggesting changes in the fungal community composition as a result of nutrient enrichment. Remarkably, our findings contrast with previous work demonstrating mainly synergistic interactions between our tested fungal isolates and co-occurring autochthonous bacteria (Aeromonas spp. and Vibrio sp.) under low-nutrient conditions. This observation may indicate that bacteria and fungi exhibit distinct community-level responses, driven by nutrient conditions. This contributes to the knowledge of fungal community dynamics and interspecific interactions in an oligotrophic ecosystem, highlighting the relevance of nutrient-based shifts and antagonistic interactions in ecosystem dynamics.

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Antagonistic Activity of Pseudohalonectria and Ophioceras

Cited by 7 publications

References 0 publications

Fungi on submerged wood in the Koito River, Japan

Fungi on submerged wood in the Koito River, Japan

Interactions between abundant fungal species influence the fungal community assemblage on limestone

Experimental Analysis of Interactions Among Saprotrophic Fungi from A Phosphorous-Poor Desert Oasis in the Chihuahuan Desert

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