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
 Genetics and Sustainable Agriculture Research: Mississippi State, MS
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                                    Software
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Southeast Area Mississippi State, Mississippi Crop Science Research Laboratory Genetics and Sustainable Agriculture 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

Title:   Author  item
                                            YNTURI, P - MISSISSIPPI STATE UNIVitem
                                            Jenkins, Johnieitem
                                            McCarty, Jackitem
                                            Saha, Sukumar
  Submitted to: National Cotton Council Beltwide Cotton Conference
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 1/5/2004
                                    Publication  Date: 5/1/2004
                                    Citation: Ynturi, P., Jenkins, J.N., McCarty Jr, J.C., Saha, S. 2004. Segregation for root-knot nematode resistance gene(s)in F2 populations from resistant x susceptible crosses [abstract]. National Cotton Council Beltwide Cotton Conference. p. 1112.Interpretive Summary:
                                Technical Abstract: One of the serious pests of upland cotton (Gossypium hirsutum L.) is the southern root-knot nematode (RKN), Meloidogyne incognita (Kofoid and White) chitwood race 3 that causes severe yield losses to cotton. This study was conducted to identify mode of genetic inheritance of RKN resistance genes using two F2 populations derived from two different crosses (Resistant Near Isogenic Line X Susceptible Near Isogenic Line) and (Resistant Near Isogenic Line X ST213). The segregation of resistant and susceptible genes in these two F2 populations was determined using gall index ratios. All the plants were evaluated in a greenhouse experiment for root galling index after being grown for six weeks in pots inoculated with nematode eggs. Root galling was rated using an indexed scoring system ranging from 1 (least galling) to 5 (severe galling). First, out of one hundred and twelve F2 progenies obtained from a cross of (RNIL X SNIL), thirty-two scored resistant and eighty scored susceptible. Out of one-hundred and ten F2 progenies obtained from a cross of (RNIL X ST 213) twenty-nine scored resistant and eighty-one scored susceptible.  The probability (p) values for the ratios (3:1) and (13:3) in both populations are greater than 0.05. These results indicated an approximate segregation ratio of 3:1 or 13:3 for susceptible and resistant in both F2 populations, suggesting a single recessive gene or one dominant and one recessive gene may be involved in controlling the resistance trait. Further F2 populations are being screened using SSR primers.


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