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
                                            Gitz, Dennisitem
                                            Britz, Stevenitem
                                            SULLIVAN, JOE - NRSL UNVI. OF MARYLANDitem
                                            Liu Gitz, Lan
  Submitted to: Environmental and Experimental Botany
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 4/19/2004
                                    Publication  Date: 6/1/2005
                                    Citation: Gitz, D.C., Britz, S.J., Sullivan, J., Liu Gitz, L. 2005. Utraviolet-B effects on stomatal density, water use efficiency, and stable carbon isotope discrimination in four glasshouse-grown soybean cultivars. Environmental and Experimental Botany. 53(3):343-355.Interpretive Summary: Interactions between UV-B radiation and drought stress have been observed but the underlying mechanisms have not been thoroughly investigated.  We hypothesized that UV-B radiation would improve water use efficiency by its effects on epidermal development, specifically stomatal density and leaf gas exchange.  Soybean plants were grown in a greenhouse with and without simulated solar UV-B from sunlamps.  UV-B induced formation of phenols such as "flavonoids" which are thought to act as UV screening compounds.  UV-B reduced the numbers of stomata, pores which regulate water use, on the leaves. As a result, water use was reduced by UV radiation.  UV-B exerts an influence on soybean development that results in improved water use efficiency and could improve drought tolerance in some cultivars.
                                Technical Abstract: Interactions between UV-B radiation and drought stress have been observed but the underlying mechanisms have not been thoroughly investigated.  We hypothesized that UV-B radiation would improve water use efficiency by its effects on epidermal development, specifically stomatal density and leaf gas exchange.  Soybean (Glycine max L. cultivars Essex, Williams, OX921 and OX922) plants were grown for 28 d in a glasshouse with and without supplemental UV-B radiation levels of 13 kJ m-2 biologically effective radiation.  UV-B radiation increased phenolic content of leaves but reduced leaf area.  Adaxial stomatal density was reduced in all cultivars but abaxial stomatal density was only reduced in the OX922 cultivar.  Stomatal conductance was reduced in concert with stomatal density as was internal CO2 concentration (Ci). Instantaneous water use efficiency was increased in Essex, Williams and OX922 and stable carbon isotope analysis showed similar trends in long-term water use efficiency.  These results are consistent with the notion that UV-B exerts a photomorphogenic influence on soybean development that results in improved water use efficiency and could improve drought tolerance in some cultivars.


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