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
                                            Saha, Sukumaritem
                                            WU, JIXIANG - South Dakota State Universityitem
                                            Jenkins, Johnieitem
                                            McCarty, Jackitem
                                            Hayes, Russell

                                                         - *Russ*item
                                            STELLY, DAVID - Texas A&M Universityitem
                                            Campbell, Benjamin

                                                         - *Todd*
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/1/2013
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Gossypium barbadense (L.), G. tomentosum (Seem.), G. mustelinum (Watt.) and G. darwinii (Watt.) are in the primary gene pool of Upland cotton (G. hirsutum).  They share a common chromosome number (2n=52), similar AD-genome architecture, and form reasonably fertile F1 hybrids. However, reduced transmission of much of the alien germplasm during backcrossing, poor performance of most products due to genetic drag effects and genomic incompatibilities at the whole genome level between the species are serious impediments in interspecific introgression using conventional breeding methods. We have developed an unique set of chromosome substitution (CS) lines from G. barbadense (CS-B) and G. tomentosum (CS-T) in a uniform genetic background of G. hirsutum (TM-1) which can help to overcome some of these problems associated with conventional methods of interspecific introgression.  Here, we report on chromosome shuffling to determine the chromosomal effects on important agronomic and fiber traits, based on a partial diallel crossing program among six CS-B lines (CS-B01, CS-B04, CS-B07, CS-B08Lo, CS-B15sh and CS-B18), six CS-T lines (CS-T01, CS-T04, CS-T07, CS-T08Lo, CS-T15sh and CS-T18), and the recurrent parent, TM-1. Considering that each substituted chromosome or chromosomal segment introduced potentially significant genetic factors from the donor species in the TM-1 genetic background, the comparative methods were used to detect the chromosome (or chromosome segment) effects on the traits of interest.  The parental lines and F2 hybrids from the cross of individual CS line with TM-1 were planted in a randomized complete block design with four replications in five environments. We used an additive-dominance (AD) with G×E interaction genetic model for data analysis.  Results revealed that the CS lines harbor useful additive and dominance alleles for specific traits compared to the recurrent parent TM-1.  For example, TM-1 had additive genetic effects for fiber strength 0.232g/tex, micronaire 0.020 and lint percentage -0.044, whereas CS-B08Lo had additive genetic effects for fiber strength 1.611g/tex and lint percentage 2.216, respectively. CS-T07 had additive genetic effects on fiber strength 0.703 g/tex and micronaire -0.182, respectively.  These findings are significant to germplasm improvement because results revealed that 1) exotic germplasm from unadapted species is a source of new and potentially valuable genes for improving agronomic and other important fiber quality traits; 2) epistasis plays a major role in the observed traits and reveals the cryptic presence of beneficial alleles in genomes of the unadapted species and 3) interspecific chromosome substitution lines can be used as a tool to overcome the biological and technical challenges associated with conventional methods of interspecific introgression and breeding.


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