Aerobic and anaerobic fungal metabolism and Omics insights for increasing polycyclic aromatic hydrocarbons biodegradation

Aydın, Sevcan; Karaçay, Hatice Aygün; Shahi, Aiyoub; Gökçe, Selen; İnce, Bahar; İnce, Orhan

doi:10.1016/j.fbr.2016.12.001

Cited by 87 publications

(37 citation statements)

References 82 publications

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“…Many of our most abundant fire-responsive bacterial taxa ( Aeromicrobium , Massilia , and Burkholderia-Paraburkholderia ) are genetically identical in the sequenced region to organisms that have been identified as aromatic C-degraders [85,90–91] (Supplemental Note 7). Similarly, numerous fungi with lignolytic capabilities are also able to degrade other aromatic C structures, and include species within the genera Penicillium and Mucor , for which we identified positive fire-responsive OTUs [34,92] (Figure 5; Supplemental Table 7).…”

Section: Discussionmentioning

confidence: 93%

Soil Bacterial and Fungal Response to Wildfires in the Canadian Boreal Forest Across a Burn Severity Gradient

Whitman

Woolet

et al. 2019

Preprint

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Global fire regimes are changing, with increases in wildfire frequency and severity expected for many North American forests over the next 100 years. Fires can result in dramatic changes to C stocks and can restructure plant and microbial communities, which can have long-lasting effects on ecosystem functions. We investigated wildfire effects on soil microbial communities (bacteria and fungi) in an extreme fire season in the northwestern Canadian boreal forest, using field surveys, remote sensing, and high-throughput amplicon sequencing. We found that fire occurrence, along with vegetation community, moisture regime, pH, total carbon, and soil texture are all significant predictors of soil microbial community composition. Communities become increasingly dissimilar with increasingly severe burns, and the burn severity index (an index of the fractional area of consumed organic soils and exposed mineral soils) best predicted total bacterial community composition, while burned/unburned was the best predictor for fungi. Globally abundant taxa were identified as significant positive fire responders, including the bacteria Massilia sp. (64x more abundant with fire) and Arthrobacter sp. (35x), and the fungi Penicillium sp. (22x) and Fusicladium sp. (12x) Bacterial and fungal co-occurrence network modules were characterized by fire responsiveness as well as pH and moisture regime. Building on the efforts of previous studies, our results identify specific fire-responsive microbial taxa and suggest that accounting for burn severity improves our understanding of their response to fires, with potentially important implications for ecosystem functions.

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Section: Discussionmentioning

confidence: 93%

Soil Bacterial and Fungal Response to Wildfires in the Canadian Boreal Forest Across a Burn Severity Gradient

Whitman

Woolet

et al. 2019

Preprint

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“…On Earth, fungi and microorganisms dwelling in clouds, and on the surface/subsurface, have a major role in organic compound degradation (Amato et al 2007a,b;Ariya et al 2002;Côté et al 2008); and they play the same role in regard to hydrocarbons (Aydin et al 2017;Heider et al 1998). It is possible that the lack of evidence for Venusian hydrocarbons is due to rapid mineralization and consumption, serving as an energy source for Venusian organisms; similar to what occurs on Earth.…”

Section: R E T Rmentioning

confidence: 99%

RETRACTED ARTICLE: Life on Venus and the interplanetary transfer of biota from Earth

Joseph¹

2019

Astrophys Space Sci

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Evidence and observations favoring the hypothesis that Venus is habitable, and the celestial mechanisms promoting the interplanetary transfer of life, are reviewed. Venus may have been contaminated with Earthly life early in its history via interplanetary transfer of microbe-laden bolide ejecta; and this seeding with life may have continued into the present via spacecraft and due to radiation pressure and galactic winds blowing microbial-laden dust ejected from the stratosphere via powerful solar winds, into the orbit and atmosphere of Venus. Venus may have had oceans and rivers early in its history until 750 mya, and, hypothetically, some of those species which, theoretically, colonized the planet during that time, may have adapted and evolved when those oceans evaporated and temperatures rose. Venus may be inhabited by a variety of extremophiles which could flourish within the lower cloud layers, whereas others may dwell 10 m below the surface where temperature may be as low as 200 ∘C—which is within the tolerance level of some hyperthermophiles. Speculation as to the identity of mushroom-shaped specimens photographed on the surface of Venus by the Russian probe, Venera 13 support these hypotheses.

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“…Our results show that respiration rates not only substantially increase following illumination, but also are constant over time (linear) at external O 2 concentrations above ~ 25 μ. The linearity can be explained by the available O 2 concentration being above the reversible O 2 binding affinity to the terminal respiratory enzymes of the fungus (Joseph-Horne et al 2001;Aydin et al 2017). By contrast, the gross photosynthetic O 2 production rate does not vary substantially with extracellular O 2 content (aerobic versus anaerobic).…”

Section: The Role Of Photosynthetically Produced O 2 and Sugars Boostmentioning

confidence: 96%

Symbiosis extended: exchange of photosynthetic O2 and fungal-respired CO2 mutually power metabolism of lichen symbionts

2019

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Lichens are a symbiosis between a fungus and one or more photosynthetic microorganisms that enables the symbionts to thrive in places and conditions they could not compete independently. Exchanges of water and sugars between the symbionts are the established mechanisms that support lichen symbiosis. Herein, we present a new linkage between algal photosynthesis and fungal respiration in lichen Flavoparmelia caperata that extends the physiological nature of symbiotic co-dependent metabolisms, mutually boosting energy conversion rates in both symbionts. Measurements of electron transport by oximetry show that photosynthetic O 2 is consumed internally by fungal respiration. At low light intensity, very low levels of O 2 are released, while photosynthetic electron transport from water oxidation is normal as shown by intrinsic chlorophyll variable fluorescence yield (period-4 oscillations in flash-induced Fv/Fm). The rate of algal O 2 production increases following consecutive series of illumination periods, at low and with limited saturation at high light intensities, in contrast to light saturation in free-living algae. We attribute this effect to arise from the availability of more CO 2 produced by fungal respiration of photosynthetically generated sugars. We conclude that the lichen symbionts are metabolically coupled by energy conversion through exchange of terminal electron donors and acceptors used in both photosynthesis and fungal respiration. Algal sugars and O 2 are consumed by the fungal symbiont, while fungal delivered CO 2 is consumed by the alga.

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Aerobic and anaerobic fungal metabolism and Omics insights for increasing polycyclic aromatic hydrocarbons biodegradation

Cited by 87 publications

References 82 publications

Soil Bacterial and Fungal Response to Wildfires in the Canadian Boreal Forest Across a Burn Severity Gradient

Soil Bacterial and Fungal Response to Wildfires in the Canadian Boreal Forest Across a Burn Severity Gradient

RETRACTED ARTICLE: Life on Venus and the interplanetary transfer of biota from Earth

Symbiosis extended: exchange of photosynthetic O2 and fungal-respired CO2 mutually power metabolism of lichen symbionts

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