ABS84957
Stomatal aperture regulation in response to UV-A: the role of the cGMP phosphodiesterase PDE1



Jean-Charles Isner*
School of Biological Sciences, Life Sciences Building, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TH, UK
Teagasc Crops Environment and Land Use Programme, Oak Park Research Centre, Carlow, Ireland

Alistair Hetherington
School of Biological Sciences, Life Sciences Building, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TH, UK

*Presenting Author


Although UV-A radiation (315-400nm) represents 95% of the UV radiation reaching the equator, surprisingly little is known about its effects on plants. We show that, in Arabidopsis, UV-A inhibits the opening of leaf surface pores known as stomata and that this requires a reduction in the cytosolic level of cGMP. Using bioinformatic strategies we identified a cGMP activated phosphodiesterase (AtCN-PDE1) that is required for the UV-A-induced decrease in cGMP. UV-A-inhibited stomatal opening may represent a mechanism to facilitate water conservation.