Short-term physiological and developmental responses to nitrogen availability in hybrid poplar
Article first published online: 28 APR 2005
Volume 167, Issue 1, pages 41–52, July 2005
How to Cite
Cooke, J. E. K., Martin, T. A. and Davis, J. M. (2005), Short-term physiological and developmental responses to nitrogen availability in hybrid poplar. New Phytologist, 167: 41–52. doi: 10.1111/j.1469-8137.2005.01435.x
- Issue published online: 28 APR 2005
- Article first published online: 28 APR 2005
- Received: 15 December 2004 Accepted: 28 February 2005
- bark storage protein;
- carbon–nitrogen balance;
- leaf development;
- pectin methylesterase inhibitor;
- sylleptic branching
- • Nitrogen fertilization induces dramatic changes in the growth and development of plants, including forest trees. In this study we examined short-term responses of hybrid poplar, Populus balsamifera ssp. trichocarpa × deltoides, to N fertilization.
- • Glasshouse-grown saplings subjected to limiting, intermediate, and luxuriant levels of ammonium nitrate over a 28 d time course demonstrated rapid changes to whole-plant architecture and biomass accumulation. Nitrogen-associated shifts in allocation occurred in temporally distinct stages. Nitrogen availability modulated parameters that affect carbon gain, including light-saturated net photosynthesis and leaf area. These parameters were affected by N-induced changes to leaf maturation and senescence. Leaf area was also affected by N-induced sylleptic branch development.
- • Genes encoding vegetative storage proteins and starch biosynthetic enzymes exhibited contrasting patterns of expression under differential N availability. A gene encoding a previously uncharacterized putative pectin methylesterase inhibitor displayed expression patterns comparable to the starch biosynthetic genes.
- • The results of this study illustrate the phenotypic plasticity that P. balsamifera ssp. trichocarpa × deltoides exhibits in response to differential N availability.