Photosynthetic performance and water relations in young pubescent oak (Quercus pubescens) trees during drought stress and recovery
Article first published online: 9 MAR 2007
© The Authors (2007). Journal compilation © New Phytologist (2007)
Volume 174, Issue 4, pages 799–810, June 2007
How to Cite
Gallé, A., Haldimann, P. and Feller, U. (2007), Photosynthetic performance and water relations in young pubescent oak (Quercus pubescens) trees during drought stress and recovery. New Phytologist, 174: 799–810. doi: 10.1111/j.1469-8137.2007.02047.x
- Issue published online: 9 MAR 2007
- Article first published online: 9 MAR 2007
- Received: 29 November 2006 Accepted: 22 January 2007
- drought stress;
- nonstomatal limitations;
- PSII activity;
- Quercus pubescens (pubescent oak);
- xanthophyll cycle
- • The capability to withstand and to recover from severe summer droughts is becoming an important issue for tree species in central Europe, as dry periods are predicted to occur more frequently over the coming decades.
- • Changes in leaf gas exchange, chlorophyll a fluorescence and leaf compounds related to photoprotection were analysed in young Quercus pubescens trees under field conditions during two summers (2004 and 2005) of progressive drought and subsequent rewatering.
- • Photochemistry was reversibly down-regulated and dissipation of excess energy was enhanced during the stress phase, while contents of leaf pigments and antioxidants were almost unaltered. Plant water status was restored immediately after rewatering. Net photosynthesis (Pn) measured at ambient CO2 recovered from inhibition by drought within 4 wk. Pn measured at elevated CO2– to overcome stomatal limitations – was restored after a few days.
- • A network of photoprotective mechanisms acted in preserving the potential functionality of the photosynthetic apparatus during severe drought, leading to a rapid recovery of photosynthetic activity after rewatering. Thus, Q. pubescens seems to be capable of withstanding and surviving extreme drought events.