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

Abstract

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 O2 is consumed internally by fungal respiration. At low light intensity, very low levels of O2 are released, while photosynthetic electron transport from water oxidation is normal as shown by intrinsic chlorophyll variable fuorescence yield (period-4 oscillations in fash-induced Fv/Fm). The rate of algal O2 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 efect to arise from the availability of more CO2 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 bothmore » photosynthesis and fungal respiration. Algal sugars and O2 are consumed by the fungal symbiont, while fungal delivered CO2 is consumed by the alga.« less

Authors:
ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1618500
Alternate Identifier(s):
OSTI ID: 1623623
Grant/Contract Number:  
FG02-10ER16195; SC0005354
Resource Type:
Published Article
Journal Name:
Photosynthesis Research
Additional Journal Information:
Journal Name: Photosynthesis Research Journal Volume: 143 Journal Issue: 3; Journal ID: ISSN 0166-8595
Publisher:
Springer Science + Business Media
Country of Publication:
Netherlands
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Plant Sciences; Algae; Fungi; Lichens; Metabolism; Oxygenic photosynthesis; Respiration; Symbiosis

Citation Formats

ten Veldhuis, Marie-Claire, Ananyev, Gennady, and Dismukes, G. Charles. Symbiosis extended: exchange of photosynthetic O2 and fungal-respired CO2 mutually power metabolism of lichen symbionts. Netherlands: N. p., 2019. Web. https://doi.org/10.1007/s11120-019-00702-0.
ten Veldhuis, Marie-Claire, Ananyev, Gennady, & Dismukes, G. Charles. Symbiosis extended: exchange of photosynthetic O2 and fungal-respired CO2 mutually power metabolism of lichen symbionts. Netherlands. https://doi.org/10.1007/s11120-019-00702-0
ten Veldhuis, Marie-Claire, Ananyev, Gennady, and Dismukes, G. Charles. Tue . "Symbiosis extended: exchange of photosynthetic O2 and fungal-respired CO2 mutually power metabolism of lichen symbionts". Netherlands. https://doi.org/10.1007/s11120-019-00702-0.
@article{osti_1618500,
title = {Symbiosis extended: exchange of photosynthetic O2 and fungal-respired CO2 mutually power metabolism of lichen symbionts},
author = {ten Veldhuis, Marie-Claire and Ananyev, Gennady and Dismukes, G. Charles},
abstractNote = {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 O2 is consumed internally by fungal respiration. At low light intensity, very low levels of O2 are released, while photosynthetic electron transport from water oxidation is normal as shown by intrinsic chlorophyll variable fuorescence yield (period-4 oscillations in fash-induced Fv/Fm). The rate of algal O2 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 efect to arise from the availability of more CO2 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 O2 are consumed by the fungal symbiont, while fungal delivered CO2 is consumed by the alga.},
doi = {10.1007/s11120-019-00702-0},
journal = {Photosynthesis Research},
number = 3,
volume = 143,
place = {Netherlands},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1007/s11120-019-00702-0

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