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
 Dale Bumpers National Rice Research Center: Stuttgart, AR
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Southeast Area Stuttgart, Arkansas Dale Bumpers National Rice Research Center 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
                                            Eizenga, Georgiaitem
                                            Tai, Thomasitem
                                            LEE, FLEET - UA RRECitem
                                            Jia, Yulin
  Submitted to: Rice Technical Working Group Meeting Proceedings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/24/2002
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract:   Rice wild relatives, Oryza sp., are a valuable source of pest resistance   genes to use for improvement of cultivated rice.  Blast caused by   Pyricularia grisea and sheath blight caused by Rhizoctonia solani, are   the primary rice fungal diseases affecting US rice.  The objectives were   to screen Oryza sp. accessions and backcross progenies from crosses with    rice cultivars, RU9401188 and Bengal, for resistance to US races of P.   grisea and to identify microsatellite markers which could be used to   follow the introgression of Oryza sp. DNA into cultivated rice.  Oryza   sp., F2, BC1F2 and BC2F2 progenies were inoculated with US blast at the   four leaf growth stage.  One week after inoculation, plants were rated   for blast susceptibility using the scale of 0=no lesions to 9=large   susceptible lesions and/or leaves dying.  About 2-4 weeks after the   first inoculation the plants were evaluated a second time by inoculating    and rated newly formed leaves.  Blast evaluations showed two O. nivara   accessions and one O. rufipogon accession had resistance to most of the   US blast races.  Results from blast inoculations of the F2 progeny   produced by fertile F1, BC1 and BC2 plants indicate that resistance to   the blast races was transferred into US cultivars from the Oryza sp.   Parent and progeny DNAs have been analyzed using microsatellite markers   from each rice chromosome.  Additional markers were surveyed for   chromosome regions which contain known blast resistance genes (Pi-   genes).  Of the 57 markers surveyed to date, 21 appear to be polymorphic   for at least one cross tested and useful for following the introgression   of Oryza sp. DNA into cultivated rice.


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