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Effects of CO2 and Nitrogen on Plant Response to Heat Stress

WANG, DAN
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1225299873

Abstract Details

2008, Doctor of Philosophy, University of Toledo, Biology (Ecology).
More intense, more frequent, and longer heat-waves are expected in the future due to global warming, both of which could have dramatic ecological impacts. It is necessary to determine how elevated CO2 and N affect plant responses to heat stress because atmospheric CO2 and N deposition will increase in the future. In the first project, we found thermotolerance of Pn in elevated (vs. ambient) CO2 increased in C3, but decreased in C4 (especially) and CAM (high growth temperature only), species. In contrast, elevated CO2 decreased electron transport in 10-of-11 species. High CO2 decreased gst (stomatal conductance) in 5 of 9 species, but stomatal limitations to Pn increased during heat stress in only 2 cool-season C3 species. Thus, benefits of elevated CO2 to photosynthesis at normal temperatures may be partly offset by negative effects during stress, especially for C4 species, so effects of elevated CO2 on acute heat tolerance may contribute to future changes in plant productivity, distribution, and diversity. The second project showed that effects of elevated CO2 on plant tolerance to heat stress are also dependent on N availability. Negative effects of high CO2 were associated with decreased CE (carboxylation efficiency) and rubisco activase (except high-N barley) and HSPs (especially HSP70). My meta-analysis results showed that elevated CO2 affects plant physiology and growth to varying degrees under different temperature regimes. The field study examined the effects of N availability on plant response to heat-stress (HS) treatment in naturally-occurring vegetation. The results indicated that increasing nitrogen (N) availability will likely impact plant responses to heat stress, and thus carbon (C) sequestration in terrestrial ecosystems, which suggests that heat waves, though transient, could have significant effects on plants, communities, and ecosystem N cycling, and N can influence the effect of heat waves.
Scott Heckathorn (Committee Chair)
Jiquan Chen (Committee Member)
Jonathan Frantz (Committee Member)
Stacy Philpott (Committee Member)
Asko Noormets (Committee Member)
177 p.
Ecology
temperature CO2 thermotolerance meta-analysis

Recommended Citations

Citations

  • WANG, D. (2008). Effects of CO2 and Nitrogen on Plant Response to Heat Stress [Doctoral dissertation, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1225299873

    APA Style (7th edition)

  • WANG, DAN. Effects of CO2 and Nitrogen on Plant Response to Heat Stress. 2008. University of Toledo, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1225299873.

    MLA Style (8th edition)

  • WANG, DAN. "Effects of CO2 and Nitrogen on Plant Response to Heat Stress." Doctoral dissertation, University of Toledo, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1225299873

    Chicago Manual of Style (17th edition)

toledo1225299873
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© 2008, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.