An association between past levels of ozone column depletion and the pollen morphology of the model angiosperm Arabidopsis thaliana L
Item Type:Journal Article
Citation:Murphy, B.R. and Mitchell, F.J.G.,, An association between past levels of ozone column depletion and the pollen morphology of the model angiosperm Arabidopsis thaliana L, Review of Palaeobotany and Palynology, 194, 2013, 12 - 20
The currently reduced stratospheric ozone layer remains sensitive to destructive anthropogenic and natural inputs. We hypothesised that a sudden increase in surface ultraviolet-B (UV-B) irradiation, as may have occurred in a past mass extinction event, would have a significant effect on the pollen grain morphology of the model angiosperm Arabidopsis thaliana L. Plants of Arabidopsis thaliana in controlled-environment chambers were exposed to an increase in UV-B irradiation associated with an ozone column reduction of 70%. Pollen grains were examined with light and electron microscopy for morphological abnormalities. In this study, we found that a wild-type Arabidopsis thaliana accession showed a significant increase in the proportion of pollen grain morphological abnormalities in response to the increase in UV-B irradiation. Plants exposed to ambient conditions in early growth had less pollen morphological abnormalities when exposed to a subsequent increase in UV-B. Results here suggest that any future decrease in stratospheric ozone similar to that implicated in the end-Permian mass extinction event may increase angiosperm pollen morphological abnormalities, with uncertain and potentially negative consequences for plant reproductive success.
Type of material:Journal Article
Series/Report no:Review of Palaeobotany and Palynology;
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