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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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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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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dc.contributor.author Álvarez, R.
dc.contributor.author Hoyo, Alberto del
dc.contributor.author Díaz-Rodríguez, C.
dc.contributor.author Coello, A. J.
dc.contributor.author del Campo López, Eva María
dc.contributor.author Barreno Rodríguez, Eva
dc.contributor.author Catalá, M.
dc.contributor.author Casano, Leonardo M.
dc.date.accessioned 2016-06-21T08:15:51Z
dc.date.available 2016-06-21T08:15:51Z
dc.date.issued 2014
dc.identifier.uri http://hdl.handle.net/10550/54141
dc.description.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.
dc.language.iso eng
dc.relation.ispartof Microbial Ecology, 2014, vol. 69, p. 698-709
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Álvarez, R.; Hoyo, Alberto del; Díaz-Rodríguez, C.; Coello, A. J.; del Campo López, Eva María; Barreno Rodríguez, Eva; Catalá, M.; Casano, Leonardo M. (2014) Lichen rehydration in heavy metal polluted environments: Pb modulates the oxidative response of both Ramalina farinacea thalli and its isolated microalgae Microbial Ecology 69 698 709
dc.subject Botànica
dc.title Lichen rehydration in heavy metal polluted environments: Pb modulates the oxidative response of both Ramalina farinacea thalli and its isolated microalgae
dc.type info:eu-repo/semantics/article
dc.date.updated 2016-06-21T08:15:52Z
dc.identifier.doi http://dx.doi.org/10.1007/s00248-014-0524-0
dc.identifier.idgrec 105648

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