The response of two eucalypts grown in elevated [CO{sub 2}] to high temperatures and water deficits
Journal Article
·
· Bulletin of the Ecological Society of America
OSTI ID:95874
- Australian National Univ., Canberra (Australia)
A shift in species distribution associated with global climate change may be dependent on the response of seedlings to extreme stress events. Seedlings of Eucalyptus macrorhyncha and E. rossii were grown for 8 weeks in either ambient (350 ppm) or elevated (700 ppm) CO{sub 2} concentrations and either well watered or without water additions and subjected to a daily, 3 h, high light (1250 mmol m{sup -2} s{sup -1}) and high temperature (45{degrees}C) stress period. Seedlings grown, in elevated [CO{sub 2}] had lower photosynthetic efficiencies as measured by chlorophyll fluorescence (F{sub v}/F{sub m}) than seedlings grown in ambient [CO{sub 2}]. However, no significant differences in F{sub v}/F{sub m} were observed between CO{sub 2} treatments for water stressed seedlings. A reduction in photosynthetic capacity was observed for plants grown in elevated [CO{sub 2}] when well watered but not when water stressed. Both species showed reduced stomatal conductance when grown in elevated [CO{sub 2}]. Water stressed seedlings of E. macrorhyncha had lower leaf water potentials as well as increased carbon allocation to roots when grown in elevated than in ambient [CO{sub 2}]. In conclusion, elevated [CO{sub 2}] may exacerbate high temperature photoinhibition, but low soil moisture may lessen the effect.
- OSTI ID:
- 95874
- Report Number(s):
- CONF-9507129--
- Journal Information:
- Bulletin of the Ecological Society of America, Journal Name: Bulletin of the Ecological Society of America Journal Issue: 2 Vol. 76; ISSN BECLAG; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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