Arbuscular mycorrhizal fungal diversity in tropical sand dune and restinga at Peró Beach in Rio de Janeiro state, Brazil

Silva, Fábio São Pedro da; Ignácio, Itamar Garcia; Júnior, Orivaldo José Saggin; Patreze, Camila Maistro

doi:10.1016/j.funeco.2018.12.003

Cited by 4 publications

(5 citation statements)

References 34 publications

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“…Furthermore, the extrapolated rarefaction curves suggested that the species richness, especially in the aquatic condition, may be even higher. AMF constitutes an important adaptation in stressful abiotic conditions such as restinga, where high temperatures, strong winds, salinity and low nutrients availability in soil limit the establishment and maintenance of vegetation [36,115,116], and high richness has already been reported in previous investigations [37,40]. These fungi are also thought to play a key role for aquatic macrophytes that live in nutritionally poor sediments such as oligotrophic lakes, and greater richness has been recovered from these lakes to the detriment of mesotrophic and eutrophic [22,117].…”

Section: Discussionmentioning

confidence: 68%

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Richness of Arbuscular Mycorrhizal Fungi in a Brazilian Tropical Shallow Lake: Assessing an Unexpected Assembly in the Aquatic-Terrestrial Gradient

et al. 2022

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Aquatic ecosystems are historically overlooked regarding the occurrence of Arbuscular Mycorrhizal Fungi (AMF). Tropical lakes in the southern hemisphere are generally impacted by human actions, such as those in Brazil, although they still preserve a great diversity of macrophyte species that can support AMF communities. Thus, the study aimed to test (i) whether AMF community structure (composition, richness, diversity, dominance, and evenness) differs between aquatic and terrestrial conditions, and (ii) between seasons—rainy and dry. A total of 60 AMF species, distributed in 10 families and 17 genera, were found, with a difference in AMF composition between conditions (terrestrial and aquatic) and seasons (dry and rainy). The absolute species richness differed between conditions, seasons, and interactions. The aquatic/rainy season, which retrieved the most significant number of species, had the highest absolute richness and number of glomerospores and differed significantly from the terrestrial/rainy season. The results suggest that a shallow oligotrophic lake harbors a high AMF richness. In addition, this environment has a distinct AMF community from the adjacent coastal sand plain vegetation and is affected by seasonality.

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Section: Discussionmentioning

confidence: 68%

“…Under these conditions, the association with AMF is an essential adaptive strategy [35]. Taxonomic and ecological studies have already been conducted in Brazilian restingas, investigating the relationship of AMF communities with mining activity [36,37], vegetation [38,39], seasonality and soil chemical attributes [40].…”

Section: Introductionmentioning

confidence: 99%

Richness of Arbuscular Mycorrhizal Fungi in a Brazilian Tropical Shallow Lake: Assessing an Unexpected Assembly in the Aquatic-Terrestrial Gradient

et al. 2022

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“…In this study, drought stress significantly reduces the abundance of tomentella and its drought tolerance is relatively low; Mortierella is a soil habitant and a fungus with strong cellulose decomposition ability. Mortierella, belonging to zygomycetes, is identified as a microorganism beneficial to soil [41], which has a good effect on improving soil structure and soil nutrient availability [42]. Our research shows that Mortierella first increases and then decreases with the aggravation of drought stress, and its drought tolerance is low.…”

Section: Discussionmentioning

confidence: 74%

Changing trends of soil fungal communities in the western foot of the Greater Khingan Mountains under drought stress

Wei,

Fang,

et al. 2024

Second International Conference on Electrical, Electronics, and Information Engineering (EEIE 2023)

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Variation of soil moisture affect the structure and diversity of fungal communities. Therefore, in-depth research on soil fungal community under drought stress has important theoretical and practical significance for the western foothills of the Great Xing'an Mountains. We controlled the moisture content of the soils retrieved from the western foothills of the Greater Khingan at 20%, 15%, 10%, 5% and 0%, respectively, simulating drought stress scenario. A total of 3091 OTU sequences with 97% similarity were found by clustering, scattered in 8 phyla, 30 classes, 101 orders, 196 families and 308 genera, mainly in the phylum Ascomycetes, Basidiomycetes, Chytridiomycetes and Glomeromycota, with the highest relative abundance of 70.07% in Ascomycetes.W20 had five biomarkers, W15 had one, W10 had eight, W5 had three, and W0 had four. Drought stress reduced the abundance of Ascomycota, Zygomycota, Basidiomycota, and Glomeromycota substantially. Among them, Ascomycota showed a large increasing trend as drought stress increased, which may be attributed to Ascomycota's high species variety and evolutionary pace, which is more adapted for arid environments. The quantity of Fusarium, Chaetomium, monograhella, Trichoderma, Cercophora, Alternaria, Talaromyces, Conocybe, Amanita, and tomentella was considerably impacted by drought stress. Fusarium's relative abundance increased, then decreased, and then increased as drought stress increased, indicating that it has a strong adaptability to drought. It can cause plant root rot and other diseases, but Fusarium can also secrete cellulase, which plays a role in decomposing soil carbon, and participate in the dissolution of soil insoluble phosphorus with Penicillium, so as to improve phosphorus absorption and utilization by plants.

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“…“In this ecosystem where plants need to constantly deal with various environmental stresses, the symbiotic association of plants with arbuscular mycorrhizal fungi (AMF) is one of the main strategies for their survival, due to the ability of external fungal hyphae to absorb the scarce nutrients and water from the substrate, as well as hyphae contributing to soil aggregation … .and salinity tolerance,” noted da Silva and co-workers discussing the important ecological role played by AMF in restinga. 63 A host of studies conducted in the restinga across Brazil since the 1990s have indeed revealed many details of the AMF communities in these ecosystems, revealing that most of coastal dune plants investigated were associated with arbuscular mycorrhiza and that restinga AMF are significantly diverse. 64 , 65 In this context, it is relevant to note that Guapira— and likely other restinga host plants beyond — is a dual-mycorrhizal species, capable of hosting both arbuscular mycorrhizal and ectomycorrhizal associations.…”

Section: Resultsmentioning

confidence: 99%

Restinga ectomycorrhizae: a work in progress

et al. 2023

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Background: The Brazilian Atlantic Forest is one of the most biodiverse terrestrial ecoregions of the world. Among its constituents, restinga vegetation makes a particular case, acting as a buffer zone between the oceans and the forest. Covering some 80% of Brazilian coastline (over 7,300 km in length), restinga is a harsh environment where plants and fungi interact in complex ways that just now are beginning to be unveiled. Ectomycorrhizal symbiosis, in particular, plays a so far ungauged and likely underestimated role. We recently described the morpho-anatomical and molecular features of the ectomycorrhizae formed by several basidiomycetous mycobionts on the host plant Guapira opposita, but the mycorrhizal biology of restinga is still largely unexplored. Here, we report new data on the ectomycorrhizal fungal symbionts of G. opposita, based on the collection of sporomata and ectomycorrhizal root tips in restinga stands occurring in southern Brazil. Methods: To obtain a broader view of restinga mycorrhizal and ecological potential, we compiled a comprehensive and up-to-date checklist of fungal species reported or supposed to establish ectomycorrhizae on restinga-inhabiting host plants, mainly on the basis of field observations. Results: Our list comprises some 726 records, 74 of which correspond to putative ectomycorrhizal taxa specifically associated with restinga. These include several members of Boletaceae, Amanita, Tomentella/Thelephora, Russula/Lactifluus, and Clavulina, as well as hypogeous fungi, like the recently described Longistriata flava. Conclusions: Our survey reveals a significant diversity of the restinga ectomycorrhizal mycobiota, indicating the importance of this symbiosis for the ecological functioning of a unique yet poorly known and threatened ecosystem.

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Arbuscular mycorrhizal fungal diversity in tropical sand dune and restinga at Peró Beach in Rio de Janeiro state, Brazil

Cited by 4 publications

References 34 publications

Richness of Arbuscular Mycorrhizal Fungi in a Brazilian Tropical Shallow Lake: Assessing an Unexpected Assembly in the Aquatic-Terrestrial Gradient

Richness of Arbuscular Mycorrhizal Fungi in a Brazilian Tropical Shallow Lake: Assessing an Unexpected Assembly in the Aquatic-Terrestrial Gradient

Changing trends of soil fungal communities in the western foot of the Greater Khingan Mountains under drought stress

Restinga ectomycorrhizae: a work in progress

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