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Title:   Author  item
                                            McCarty, Jackitem
                                            Jenkins, Johnie
  Submitted to: Mississippi Agricultural and Forestry Experiment Station Research Report
                                    Publication Type: Experiment Station
                                    Publication Acceptance Date: 12/1/2004
                                    Publication  Date: 12/1/2004
                                    Citation: McCarty Jr., J.C., Jenkins, J.N. 2004. Primitive cotton germplasm:  yield and fiber traits for twenty-one day-neutral accessions. Mississippi Agricultural and Forestry Experiment Station Research Report 23(14). 6 p.Interpretive Summary: The improvement of cotton relies on the introduction of desirable traits.  The collection of primitive cotton accessions is a source for useful traits; however, the start of flowering for many of the accessions is day-length dependent.  The short-day photoperiod flowering response is a major hurdle to the utilization of their traits for cultivar improvement.  A backcross breeding method was used to convert accessions to day-neutrality, which do not require short-days to initiate flowers. Twenty-one day-neutral lines have been evaluated and useful genetic variability has been measured for agronomic and fiber traits.  The day-neutral accessions are now available for use in breeding programs for cultivar development and to expand genetic variability.
                                Technical Abstract: The improvement of cotton, Gossypium hirsutum L., relies on the introduction of desirable traits from germplasm resources.  Such a resource is the collection of primitive cotton accessions which contain useful genetic variability; however, many of the accessions are photoperiodic.  The short-day photoperiod flowering response is a major hurdle to their utilization in cotton breeding and research programs.  Utilizing a backcross breeding approach accessions have been converted to day-neutral flowering habit.  Twenty-one day-neutral lines have been evaluated and useful genetic variability has been measured for agronomic and fiber traits.  The day-neutral accessions are now available for use in breeding programs for cultivar development and to expand genetic variability.


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