U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            LONG, S - UNIVERSITY OF ILLINOISitem
                                            Ainsworth, Elizabeth

                                                         - *Lisa*item
                                            BERNACCHI, C - IL STATE WATER SURVEYitem
                                            LEAKEY, A D - UNIVERSITY OF ILLINOISitem
                                            Morgan, Patrickitem
                                            NAIDU, S - UNIVERSITY OF ILLINOISitem
                                            ROGERS, A - BROOKHAVEN NATIONAL LABitem
                                            BOHNERT, H - UNIVERSITY OF ILLINIOSitem
                                            Ort, Donalditem
                                            Nelson, Randall
  Submitted to: International Botanical Congress
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/17/2005
                                    Publication  Date: 7/17/2005
                                    Citation: Long, S.P., Ainsworth, E.A., Bernacchi, C.J., Leakey, A.B., Morgan, P.B., Naidu, S.L., Rogers, A., Bohnert, H.J., Ort, D.R., Nelson, R.L. 2005. Mechanisms of plant responses to global atmospheric change [abstract]. XVII International Botanical Congress.  Paper No. GL2.5.Interpretive Summary: Carbon dioxide and ozone concentrations in the atmosphere are rising.  Both of these global environmental changes directly affect crop performance.  Ozone damage currently costs crop production over 5 billions Euros per year and similar damage is caused to natural ecosystems.  New experiments that expose crops to elevated carbon dioxide and ozone under totally open-air conditions have revealed some surprising results that were not anticipated from studies in enclosures.  Season-long exposure to elevated ozone causes a decrease in plant productivity and accelerated senescence.	While carbon dioxide increases photosynthesis and plant productivity, ozone damage will significantly decrease plant produtivity in the future.
                                Technical Abstract: The CO2 and ozone (O3) concentrations of the troposphere are rising with direct impacts on plants.  O3 currently costs crop production >5bn Euro a year with parallel damage to natural ecosystems. In the short-term, elevated CO2 stimulates and elevated O3 depresses photosynthesis in highly predictable ways. Longer-term effects are less predictable, but new patterns are now emerging via meta-analysis of realistic field treatment in Free-Air Concentration Enrichment (FACE) facilities. The chain of effects from gene expression to acclimated phenotype that result from long-term growth in elevated CO2 or O3 will be reviewed. Significant season-long increases in photosynthesis and production with CO2 are found, with some surprising changes in plant development that were not apparent or suspected in studies with field enclosures. Season-long exposures to the moderate increases in O3 observed in the field caused more transcripts to be down-regulated than up-regulated, cause a chronic decrease in photosynthetic capacity, largely attributed to decreased Rubisco activity, and cause slightly accelerated senescence.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov