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
 Crops Pathology and Genetics Research: Davis, CA
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    Outreach Events
                        UC Davis Picnic Day
                                    Kinders go to College
                                    STEM Girls
                                    Future Scientist Program
                                    Agriculture Future of America
                                    Wallace-Carver Fellowship
                                    Young Scholars Program
                                    Annual Awards Banquet
                    About Us
                        About Us
                                    Our Mission
                                    Principal InvestigatorsSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Pacific West Area Davis, California Crops Pathology and Genetics Research 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
- Etiology and Biology of Tree Crop Diseases
- Rice Genetics
- Sustainable Floriculture
- Sustainable Viticulture

Title:   Author  item
                                            Baumgartner, Kendraitem
                                            TRAVADON, RENAUD - University Of Californiaitem
                                            BRUHN, JOHANN - University Of Missouriitem
                                            BERGEMANN, SARAH - Middle Tennessee State University
  Submitted to: Phytopathology
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 3/16/2010
                                    Publication  Date: 5/1/2010
                                    Citation: Baumgartner, K., Travadon, R., Bruhn, J., Bergemann, S.E. 2010. CONTRASTING PATTERNS OF GENETIC DIVERSITY AND POPULATION STRUCTURE  OF ARMILLARIA MELLEA SENSU STRICTO IN THE EASTERN AND WESTERN UNITED STATES. Phytopathology. 100:708-718.Interpretive Summary: Armillaria mellea infects over 300 plant species throughout the Northern Hemisphere.  Collections from the western US were previously found to be genetically different from those of the eastern US.  We compared patterns of genetic differentiation from collections of the pathogen gathered from four locations in the eastern US (N. and S. Appalachians, Ozarks, W. Great Lakes) and four locations in the western US (Berkeley, Los Angeles, St. Helena, and San Jose, CA).  A total of 156 strains of the pathogen were genetically characterized with 12 molecular markers known as microsatellite loci.  There were no significant genetic differences among eastern and western populations ('ST  = -0.002 and 0.004, respectively; P > 0.05), suggesting that the spread of the pathogen’s wind-dispersed spores within each region prevents genetic differentiation.  In contrast to the western US, cryptic genetic structure within the eastern US, revealed by Bayesian assignment of multilocus genotypes, suggests that eastern populations are comprised of founder from multiple sources or from a single source with a large effective population size.  The existence of shared and unshared loci among eastern and western populations and contrasting patterns of genetic diversity between regions demonstrate that eastern and western A. mellea are two geographically-isolated, divergent genetic pools of isolates.
                                Technical Abstract: Armillaria mellea infects over 300 hosts in natural and managed ecosystems throughout the Northern Hemisphere.  Previously reported nuclear genetic divergenece between eastern and western US isolates is consistent with the disjunct range of A. mellea in N. America, which is restricted mainly to the coasts of the US.  We investigated patterns of population structure and genetic diversity of eastern (N. and S. Appalachians, Ozarks, W. Great Lakes) and western US (Berkeley, Los Angeles, St. Helena, and San Jose, CA) populations.  A total of 156 diploid isolates were genotyped with 12 microsatellite loci.  Absence of geographic differentiation with eastern and western populations ('ST  = -0.002 and 0.004, respectively; P > 0.05) suggests that spore dispersal within each region prevents geographic differentiation.  In contrast to the western US populations, cryptic genetic structure within the eastern US, revealed by Bayesian assignment of multilocus genotypes, suggests that eastern populations are comprised of founder from multiple sources or from a single source with a large effective population size.  The existence of shared and unshared loci among eastern and western populations and contrasting patterns of genetic diversity between regions demonstrate that eastern and western A. mellea are two geographically-isolated, divergent genetic pools of isolates.


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