Is photorespiration affected by long-term O{sub 3} fumigation and CO{sub 2} enrichment?
Journal Article
·
· Bulletin of the Ecological Society of America
OSTI ID:95872
- North Carolina State Univ., Raleigh, NC (United States)
Photorespiration may be involved in photooxidative protection via dissipation of excess energy. Ozone, which induces oxidative protection, may increase photorespiration. In contrast long-term CO{sub 2} enrichment, which favors the carboxylase function of Ribulose bisphosphate carboxylase/oxygenase (Rubisco), may decrease photorespiration. To determine the effects of O{sub 3} and CO{sub 2} enrichment on photorespiration, soybean (Glycine max) plants were grown at 350 {mu}l l{sup -1} and 700 {mu}l l{sup -1} in charcoal-filtered air (CF) and 70 nl 1{sup -1} O{sub 3} for 12-hr day{sup -1} in open-top chambers for one growing season. At different developmental stages photorespiration, Rubisco carboxylation capacity estimated from A/C{sub i} curves, and Rubisco content were measured. For plants grown in elevated CO{sub 2}, absolute rates of photorespiration were not significantly different from control plants except during pod formation when they were significantly greater. Ozone reduced photorespiration at 350 ul 1{sup -1} (9.6 and 7.6 {mu}mol CO{sub 2} m{sup -2} s{sup -1} in CF and O{sub 3} respectively) but not in elevated CO{sub 2} (11.1 and 11.6 {mu}mol CO{sub 2} m{sup -2} s{sup -1} for CF and O{sub 3} respectively). However, relative to photosynthesis, elevated CO{sub 2} significantly reduced photorespiration from ca. 46% to 25% while O{sub 3} had little effect. Rubisco capacity for carboxylation was decreased with CO{sub 2} and O{sub 3} although Rubisco content was similar. Significant interactions between CO{sub 2} and O{sub 3} were found only at the end of the growing season for each parameter. These data suggest that increased photosynthesis at elevated CO{sub 2} may not reduce photorespiration and elevated CO{sub 2} may alter O{sub 3} effects on photorespiration.
- OSTI ID:
- 95872
- 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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