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
 Crop Production and Pest Control Research: West Lafayette, IN
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Midwest Area West Lafayette, Indiana Crop Production and Pest Control 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
- Small Grains Viral Disease Laboratory
- Corn and Sorghum Fungal Disease Laboratory
- Host Plant Resistance to Insects Laboratory
- Wheat/Hessian fly Interactions Laboratory
- Small Grains Fungal Disease Laboratory
- Soybean Quality Improvement Laboratory
- Uniform Soybean Tests, Northern Region

Title:   Author  item
                                            Goodwin, Stephen

                                                         - *Steve*item
                                            KEMA, GERT - PLANT RES. INT. NETHERL
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 3/1/2007
                                    Publication  Date: 3/28/2007
                                    Citation: Goodwin, S.B., Kema, G.H. 2007. Sequencing on the Mycosphaerella branch of the fungal evolutionary tree [abstract]. Abstracts of the 2nd Annual U.S. D.O.E. Joint Genome Institute User Meeting, Walnut Creek, CA. p. 2-3.Interpretive Summary:
                                Technical Abstract: Mycosphaerella and its asexual derivatives comprise the largest group of plant-pathogenic fungi. Many diseases caused by species of Mycosphaerella are economically significant and require huge inputs of fungicides for effective control. Despite these high economic costs, species of Mycosphaerella have been ignored for genomic sequencing until recently. This changed with the completion of the genomic sequence of the Septoria tritici blotch pathogen of wheat, M. graminicola, and of a 7.1x draft sequence of the black Sigatoka pathogen of banana, M. fijiensis. Comparison of these sequences revealed a huge and unexpected difference in genome size, from about 40 Mb for M. graminicola to more than 74 Mb for M. fijiensis. This difference apparently originated in one of the ancestors to a group of Mycosphaerella species attacking banana, and is due to amplification of transposable elements rather than to genome duplications. Some of the transposons appear to be helitrons, which have not been reported previously from ascomycete fungi. Both species seem to have a slightly smaller and possibly more specialized set of cell-wall-degrading enzymes in comparison to other plant-pathogenic fungi with sequenced genomes, which may indicate a mode of pathogenesis that involves stealth rather than brute force. The genomic sequence will provide an unprecedented picture of the genetic changes that occur during the switch from endophytic to pathogenic growth.  Enzymes that are required for pathogenicity may indicate new fungicide targets and could be useful for improving ethanol production.  The genomic sequences also showed that the closest relatives to Mycosphaerella are fungi in the order Pleosporales, in accordance with classical taxonomy.


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