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, Kendra
  Submitted to: American Society of Enology and Viticulture Annual Meeting Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 4/2/2006
                                    Publication  Date: 6/30/2006
                                    Citation: Baumgartner, K. 2006. The role of beneficial mycorrhizal fungi in grapevine nutrition. American Society of Enology and Viticulture Annual Meeting Proceedings.Interpretive Summary: Arbuscular mycorrhizal fungi are beneficial organisms that colonize plant roots. The fungus actually grows within the root itself, within the space between the cell walls and cell membranes of the root cortex. Their fungal filaments or hyphae extend outside of the root into the soil. This increases the surface capacity of the root system since the hyphae are very fine relative to the root dimensions (10 μm in diameter as compared to 3 mm). Mycorrhizal grapevines have improved shoot and root growth, higher tissue concentrations of phosphorus, and improved water relations and drought tolerance. Given the clear benefits of these mycorrhizal fungi, it is important to understand when and how they associate with root systems. The fungi can associate with a wide range of plants. Mycorrhizal weeds and cover crops can, therefore, be an important reservoir or source of these fungi for young grapevine roots. The fungi can also form large colonies or networks in the soil spanning the root systems of multiple plants. A mycorrhizal network may be simultaneously associated with a cover crop and a grapevine. The external hyphae serve as a “bridge” for nitrogen transfer between plants and can take up nitrogen from decaying cover crops that can then be transferred to the grapevine. Since the fungi receive carbon directly from the grapevine, turnover of their external hyphae provides an important source of carbon to feed other microbes in the soil.
                                Technical Abstract: Arbuscular mycorrhizal fungi are beneficial organisms that colonize plant roots. The fungus actually grows within the root itself, within the space between the cell walls and cell membranes of the root cortex. Their fungal filaments or hyphae extend outside of the root into the soil. This increases the surface capacity of the root system since the hyphae are very fine relative to the root dimensions (10 μm in diameter as compared to 3 mm). Mycorrhizal grapevines have improved shoot and root growth, higher tissue concentrations of phosphorus, and improved water relations and drought tolerance. Given the clear benefits of these mycorrhizal fungi, it is important to understand when and how they associate with root systems. The fungi can associate with a wide range of plants. Mycorrhizal weeds and cover crops can, therefore, be an important reservoir or source of these fungi for young grapevine roots. The fungi can also form large colonies or networks in the soil spanning the root systems of multiple plants. A mycorrhizal network may be simultaneously associated with a cover crop and a grapevine. The external hyphae serve as a “bridge” for nitrogen transfer between plants and can take up nitrogen from decaying cover crops that can then be transferred to the grapevine. Since the fungi receive carbon directly from the grapevine, turnover of their external hyphae provides an important source of carbon to feed other microbes in the soil.


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