NDLI: Lichen Rehydration in Heavy Metal-Polluted Environments: Pb Modulates the Oxidative Response of Both Ramalina farinacea Thalli and Its Isolated Microalgae

Content Provider	Springer Nature Link
Author	Álvarez, R. Hoyo, A. Díaz Rodríguez, C. Coello, A. J. Campo, E. M. Barre, E. Catalá, M. Casa, L. M.
Copyright Year	2014
Abstract	Lichens are adapted to desiccation/rehydration and accumulate heavy metals, which induce ROS especially from the photobiont photosynthetic pigments. Although their mechanisms of abiotic stress tolerance are still to be unravelled, they seem related to symbionts’ reciprocal upregulation of antioxidant systems. With the aim to study the effect of Pb on oxidative status during rehydration, the kinetics of intracellular ROS, lipid peroxidation and chlorophyll autofluorescence of whole Ramalina farinacea thalli and its isolated microalgae (Trebouxia TR1 and T. TR9) was recorded. A genetic characterization of the microalgae present in the thalli used was also carried out in order to assess possible correlations among the relative abundance of each phycobiont, their individual physiological responses and that of the entire thallus. Unexpectedly, Pb decreased ROS and lipid peroxidation in thalli and its phycobionts, associated with a lower chlorophyll autofluorescence. Each phycobiont showed a particular pattern, but the oxidative response of the thallus paralleled the TR1’s, agreeing with the genetic identification of this strain as the predominant phycobiont. We conclude that: (1) the lichen oxidative behaviour seems to be modulated by the predominant phycobiont and (2) Pb evokes in R. farinacea and its phycobionts strong mechanisms to neutralize its own oxidant effects along with those of rehydration.
Starting Page	698
Ending Page	709
Page Count	12
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	69
Issue Number	3
e-ISSN	1432184X
Language	English
Publisher	Springer US
Publisher Date	2014-11-04
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Heavy metal Lichen Microalga Rehydration ROS Trebouxia Microbiology Ecology Microbial Ecology Geoecology/Natural Processes Nature Conservation Water Quality/Water Pollution
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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Lichen Rehydration in Heavy Metal-Polluted Environments: Pb Modulates the Oxidative Response of Both Ramalina farinacea Thalli and Its Isolated Microalgae

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