| Title: |
Rising temperature may negate the stimulatory effect of rising CO2 on growth and physiology of Wollemi pine (Wollemia nobilis) |
| Authors: |
Lewis, James D. (R16794); Phillips, Nathan G. (R14448); Logan, Barry A. (R17565); Smith, Renee A. (R15684); Aranjuelo, Iker; Clarke, Steve (R18338); Offord, Catherine A.; Frith, Allison; Barbour, Margaret M.; Huxman, Travis; Tissue, David T. (R11531) |
| Contributors: |
Hawkesbury Institute for the Environment (Host institution); Capital Works and Facilities (Host institution) |
| Publisher Information: |
Clayton, Vic., CSIRO |
| Publication Year: |
2015 |
| Collection: |
University of Western Sydney (UWS): Research Direct |
| Subject Terms: |
XXXXXX - Unknown; photosynthesis; growth; Wollemia nobilis; carbon dioxide |
| Description: |
Rising atmospheric [CO2] is associated with increased air temperature, and this warming may drive many rare plant species to extinction. However, to date, studies on the interactive effects of rising [CO2] and warming have focussed on just a few widely distributed plant species. Wollemi pine (Wollemia nobilis W.G.Jones, K.D.Hill, & J.M.Allen), formerly widespread in Australia, was reduced to a remnant population of fewer than 100 genetically indistinguishable individuals. Here, we examined the interactive effects of three [CO2] (290, 400 and 650ppm) and two temperature (ambient, ambient+4°C) treatments on clonally-propagated Wollemi pine grown for 17 months in glasshouses under well-watered and fertilised conditions. In general, the effects of rising [CO2] and temperature on growth and physiology were not interactive. Rising [CO2] increased shoot growth, light-saturated net photosynthetic rates (Asat) and net carbon gain. Higher net carbon gain was due to increased maximum apparent quantum yield and reduced non-photorespiratory respiration in the light, which also reduced the light compensation point. In contrast, increasing temperature reduced stem growth and Asat. Compensatory changes in mesophyll conductance and stomatal regulation suggest a narrow functional range of optimal water and CO2 flux co-regulation. These results suggest Asat and growth of the surviving genotype of Wollemi pine may continue to increase with rising [CO2], but increasing temperatures may offset these effects, and challenges to physiological and morphological controls over water and carbon trade-offs may push the remnant wild population of Wollemi pine towards extinction. |
| Document Type: |
article in journal/newspaper |
| File Description: |
print |
| Language: |
English |
| Relation: |
Functional Plant Biology--1445-4408--1445-4416 Vol. 42 Issue. 9 pp: 836-850; http://purl.org/au-research/grants/arc/LP0989881; http://purl.org/au-research/grants/arc/DP0879531 |
| DOI: |
10.1071/FP14256 |
| Availability: |
http://handle.uws.edu.au:8081/1959.7/uws:31551; https://doi.org/10.1071/FP14256 |
| Accession Number: |
edsbas.99DF41E6 |
| Database: |
BASE |