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
 Horticultural Crops Research Unit: Corvallis, OR
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    Other
                        History
                                    Useful Links
                    HortHappenings News PageSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Pacific West Area Corvallis, Oregon Horticultural Crops Research Unit 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
                                            Grunwald, Niklaus

                                                         - *Nik*
  Submitted to: Proceedings of the Oomycete Molecular Genetics Network
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/10/2006
                                    Publication  Date: 5/1/2006
                                    Citation: Grunwald, N.J. 2006. Population biology of the oomycete aphanomyces euteiches: a hierarchical analysis of diversity, selfing and genetic differentiation. Proceedings of the Oomycete Molecular Genetics Network. p.30.Interpretive Summary:
                                Technical Abstract: Relatively little is known about the population biology of the legume pathogen Aphanomyces euteiches Drechs. A. euteiches is a soilborne pathogen causing Aphanomyces root rot of several legumes including alfalfa, bean, lentil and pea. Our objectives were to assess the degree of diversity, selfing and population differentiation in A. euteiches, contrasting populations within and among two geographically separated fields with a history of pea production. Molecular genotyping relied on amplified fragment length polymorphism analysis. Samples of A. euteiches recovered from two fields in northeast Oregon and western Washington confirm previous reports of moderately high genetic diversity in populations of A. euteiches at the regional scale, but reveal higher than expected genotypic diversity within individual soil samples. Populations of A. euteiches were significantly differentiated at the soil sample, field and regional level. While most variation was seen at the regional scale, considerable variation was present at the level of the soil sample. The population structure appears to be patterned by regular selfing via oospores, a mixed reproductive system including both asexual and sexual reproduction, with occasional migration of novel genotypes or outcrossing.


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