Physiological and ultrastructural effects of acute ozone fumigation in the lichen Xanthoria parietina: the role of parietin and hydration state.

Environ Sci Pollut Res Int 2018 Mar 12;25(9):8104-8112. Epub 2017 Jul 12.

Department of Life Sciences, University of Siena, Siena, Italy.

The physiological and ultrastructural effects induced by acute exposure to ozone (O) were investigated in the lichen Xanthoria parietina. Our working hypothesis was that parietin content and hydration of the thalli may play a role in the modulation of the effects of O exposure. Four batches of X. parietina samples, dry and wet, with (P+) and without (P-) parietin, were fumigated for 1 h with 3 ppm O. The effects of O were assessed immediately after the fumigation and after one week of recovery under controlled conditions. O fumigation caused physiological and ultrastructural impairment both to the photobiont and the mycobiont, irrespective if samples were fumigated wet or dry, and P+ or P-. However, one week after fumigation, a recovery was observed in P+ samples for the photobiont and in dry samples for the mycobiont. We suggest that the hydration state may play a major role in determining the severity of the damage, while the presence of parietin may promote the recovery. Our results provide physiological and ultrastructural basis to explain the ecological insensitivity of lichens to high environmental levels of ozone occurring during dry Mediterranean summers.

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-017-9545-9DOI Listing
March 2018
14 Reads

Publication Analysis

Top Keywords

physiological ultrastructural
16
hydration state
8
xanthoria parietina
8
lichen xanthoria
8
ultrastructural effects
8
play major
4
3 ppm effects
4
1 h 3 ppm
4
major role
4
effects assessed
4
exposure batches
4
physiological
4
fumigation week
4
state play
4
assessed fumigation
4
fumigated 1 h
4
role determining
4
severity damage
4
samples dry
4
dry
4

References

(Supplied by CrossRef)

Q An et al.
Cell Microbiol 2006

M Bačkorová et al.
Toxicol in Vitro 2012

A Basile et al.
Environ Pollut 2012

A Basile et al.
Int J Mol Sci 2015

DC Bassham et al.
Biochim Biophys Acta 2009

S Bertuzzi et al.
Ecol Indic 2013

DH Brown et al.
Lichenologist 1978

S Ciompi et al.
Physiol Plantarum 1997

CR Collins et al.
New Phytol 1978

L Dahlman et al.
2002

Similar Publications