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
                                            Gonzalez, Eniditem
                                            Maccree, Maryitem
                                            Zaid, Musaitem
                                            Kluepfel, Daniel
  Submitted to: Walnut Research Conference
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 1/1/2008
                                    Publication  Date: 1/1/2008
                                    Citation: Gonzalez, E.T., Maccree, M.M., Zaid, M., Kluepfel, D.A. 2008. Assessing the Genetic Diversity of Agrobacterium Tumefaciens in CA Walnut Growing Regions and Resistance to the Biocontrol Agent, A. Rhizogenes K84. Walnut Research Conference.Interpretive Summary:
                                Technical Abstract: Crown gall of walnut (Juglans sp.), caused by the bacterium Agrobacterium tumefaciens, greatly impacts the CA walnut industry.  To determine the genetic diversity of A. tumefaciens throughout the Central Valley of CA, we collected isolates from ten walnut growing counties.  A total of 340 A. tumefaciens biovar 1 isolates were collected and tested for the presence of the Ti plasmid by PCR; 190 isolates were Ti-plasmid positive or virulent.  To assess genetic diversity, BOX PCR profiles were generated for the confirmed virulent isolates.  Additionally, we tested the ability of the biocontrol agent A. rhizogenes K84 to inhibit the growth of 27 virulent A. tumefaciens biovar 1 isolates from different counties.  Fifteen isolates were found to be resistant to K84 from Kings, Butte, and Stanislaus counties.  Further analysis of the genetic heterogeneity and K84 sensitivity of California A. tumefaciens isolates will facilitate the design of effective crown gall management strategies, including more precise application of K84 depending on A. tumefaciens genotype present.


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