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
                                            NIU, GENHUA - FAS-USDAitem
                                            Timlin, Dennisitem
                                            Reddy, Vangimallaitem
                                            Kim, Soo Hyungitem
                                            Gitz, Dennis
  Submitted to: American Society of Agronomy Meetings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 11/10/2003
                                    Publication  Date: 11/20/2003
                                    Citation: Niu, G., Timlin, D.J., Reddy, V., Kim, S., Gitz, D.C. 2003. Water stress and elevated co2 effects on photosynthesis and growth in corn [abstract]. American Society of Agronomy Meetings. CDROM.Interpretive Summary:
                                Technical Abstract: The effect of water stress imposed at vegetative and reproductive stages under ambient and elevated carbon dioxide conditions on the photosynthesis, evapo-transpiration, water use efficiency, and dry matter accumulation of corn plants (Zea mays L. cv. 34N43) was evaluated.  Seeds were sowed on May 16 and were grown until R3 stage in outdoor SPAR (Soil-Plant-Atmosphere-Research) chambers where temperatures were maintained at 31/25 degree C (day/night) under ambient (370 umol mol -1) or elevated (750 umol mol -1) carbon dioxide concentrations.  Water stress was imposed to ambient and high carbon dioxide chambers during vegetative (V10 to V16) and reproductive stage (VT to R1) stages by restricting irrigation.  The canopy gross photosynthetic rates (Pg) of the plants were not affected by the two-week water stress under both carbon dioxide concentrations.  Pg of plants under elevated carbon dioxide level was reduced by 12% at the end of the one-month water stress period compared to that of plants without water stress.  Evapo-transpiration rates (ET) of plants under ambient carbon dioxide level decreased as water stress period extended, while ET of plants under elevated carbon dioxide condition did not respond to water stress.  Water use efficiency of plants was increased under elevated carbon dioxide level.  However, dry weight determined at R3 stage was not affected by water stress, regardless of carbon dioxide concentration.


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