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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

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.citation	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.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.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	journal article	es_ES
dc.date.updated	2016-06-21T08:15:52Z
dc.identifier.doi	10.1007/s00248-014-0524-0
dc.identifier.idgrec	105648
dc.rights.accessRights	open access	es_ES