Elevated night-time temperatures increase growth in seedlings of two tropical pioneer tree species
Article first published online: 21 DEC 2012
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust
Volume 197, Issue 4, pages 1185–1192, March 2013
How to Cite
Cheesman, A. W. and Winter, K. (2013), Elevated night-time temperatures increase growth in seedlings of two tropical pioneer tree species. New Phytologist, 197: 1185–1192. doi: 10.1111/nph.12098
- Issue published online: 4 FEB 2013
- Article first published online: 21 DEC 2012
- Manuscript Accepted: 12 NOV 2012
- Manuscript Received: 5 OCT 2012
- Smithsonian Tropical Research Institute
- Smithsonian Institute Global Earth Observatory
- carbon balance;
- night-time warming;
- Increased night-time temperatures, through their influence on dark respiration, have been implicated as a reason behind decreasing growth rates in tropical trees in the face of contemporary climate change.
- Seedlings of two neo-tropical tree species (Ficus insipida and Ochroma pyramidale) were grown in controlled-environment chambers at a constant daytime temperature (33°C) and a range of increasing night-time temperatures (22, 25, 28, 31°C) for between 39 d and 54 d. Temperature regimes were selected to represent a realistic baseline condition for lowland Panama, and a rise in night-time temperatures far in excess of those predicted for Central America in the coming decades. Experiments were complemented by an outdoor open-top chamber study in which night-time temperatures were elevated by 2.4°C above ambient.
- Increasing night-time temperatures resulted in > 2-fold increase in biomass accumulation in growth-chamber studies despite an increase in leaf-level dark respiration. Similar trends were seen in open-top chambers, in which elevated night-time temperatures resulted in stimulation of growth.
- These findings challenge simplistic considerations of photosynthesis-directed growth, highlighting the role of temperature-dependent night-time processes, including respiration and leaf development as drivers of plant performance in the tropics.