From ancient genes to modern communities: the cellular stress response and the evolution of plant strategies
Article first published online: 27 SEP 2005
Volume 19, Issue 5, pages 763–776, October 2005
How to Cite
PIERCE, S., VIANELLI, A. and CERABOLINI, B. (2005), From ancient genes to modern communities: the cellular stress response and the evolution of plant strategies. Functional Ecology, 19: 763–776. doi: 10.1111/j.1365-2435.2005.01028.x
- Issue published online: 10 OCT 2005
- Article first published online: 27 SEP 2005
- Received 18 March 2005; revised 23 May 2005; accepted 26 May 2005
- adaptive radiation;
- CSR plant strategy theory;
- plant functional type;
- plant strategy
- 1Two major plant strategy theories attempt to explain how phenotype determines community structure. Crucially, CSR plant strategy theory suggests that stress and sporadic resource availability favour conservative phenotypes, whereas the resource-ratio hypothesis views the spatial heterogeneity of resources as selecting for optimal foraging in chronically unproductive habitats. Which view is most realistic?
- 2The ecophysiology literature demonstrates that stress is comprised of two processes: (1) limitation of resource supply to metabolism; and (2) damage to biomembranes, proteins and genetic material (chronic stress). Thus stress is defined mechanistically as the suboptimal performance of metabolism.
- 3Adaptations to limitation buffer metabolism against variability in external resource supply; internal storage pools are more consistent. Chronic stress elicits the same ancient cellular stress response in all cellular life: investment in stress metabolites that preserve the integrity and compartmentalization of metabolic components in concert with molecular damage-repair mechanisms.
- 4The cellular stress response was augmented by morphological innovations during the Silurian–Devonian terrestrial radiation, during which nutrient limitation appears to have been a principal selection pressure (sensu CSR theory).
- 5The modern stress–tolerator syndrome is conservative and supports metabolism in limiting or fluctuating environmental conditions: standing resource pools with high investment/maintenance costs impose high internal diffusion resistances and limit inherent growth rate (sensu CSR theory).
- 6The resource-ratio hypothesis cannot account for the cellular stress response or the crucial role of ombrotrophy in primary succession. CSR theory agrees with current understanding of the cellular stress response, terrestrial radiation and modern adaptations recorded in chronically unproductive habitats, and is applicable as CSR classification.