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
                                            Mornhinweg, Dolores

                                                         - *Do*item
                                            Bockelman, Harold
  Submitted to: International Plant Resistance to Insects Workshop  Abstracts & Proceedings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 1/30/2008
                                    Publication  Date: 2/10/2008
                                    Citation: Mornhinweg, D.W., Bockelman, H.E. 2008. Greenhouse screening for bird cherry-oat aphid resistance to barley [abstract]. 18th Biennial International Plant Resistance to Insects Workshop, February 10-13, 2008, Fort Collins, Colorado. p. 33.Interpretive Summary:
                                Technical Abstract: Bird cherry-oat aphid (BCOA), Rhopalosiphum padi (L.), has been reported to cause yield loss in small grains through its role as a vector of the PAV strain of Barley yellow dwarf virus (BYDV) and by feeding damage to winter and spring small grains.  Barley accessions have been reported to have BCOA resistance based on antibiotic effect of seedlings on BCOA.  Whether this antibiosis translates to resistance in terms of grain yield has yet to be shown.  Screening for BCOA resistance at the seedling stage has been difficult due to lack of visual symptoms on seedlings using traditional greenhouse screening methods.  In an attempt to develop a seedling screening technique for BCOA we varied flat type, soil type, infestation date, infestation rate, temperature, and day length.  Seventy-eight barleys, reported to be antibiotic to BCOA, were screened with aviruliferous BCOA using traditional seedling screening methods under high temperature and long days.  Seedlings were rated visually on a scale of 1 to 7 (1= resistant and 7= dead).  Potential resistant and susceptible checks were identified.  In this study, a replicated (2X) screening of the Barley Core Collection was conducted using this technique and rating scale.  Surviving seedlings were rescued and transplanted to pots in the greenhouse.  The second screening was more severe than the first.  The first screening had 5 and 54% survival of the susceptible and resistant checks respectively while the second screening had 0.4 and 11% survival of susceptible and resistant checks.  Accession seedling survival was 95, 81, 79, 65, 45, and 27% for ratings of 1, 2, 3, 4, 5, and 6 respectively for the first screen and 93, 40, 77, 61, 59, and 47 respectively for the second screening.  Resistance was found in 266 and 279 accessions for the first and second screening respectively.  If seedling survival translates to field resistance in terms of grain yield, this seedling screening technique will be useful for identification of BCOA resistance.


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