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Title:   Author  item
                                            Ulloa, Mauricioitem
                                            Percy, Richard
  Submitted to: Abstract of Agronomy Meetings
                                    Publication Type: Other
                                    Publication Acceptance Date: 11/11/2002
                                    Publication  Date: 11/11/2002
                                    Citation: Ulloa, M., Percy, R.G. 2002. Comparison of genetic diversity within improved germplasm of cottons with rflp, ssr, and rapd markers..Crop Science abstracts, Annual Meeting ASA, CSSA, and SSSA. p. 189.Interpretive Summary:
                                Technical Abstract: Future improvements in yield potential, environmental resistance, agronomic characteristics, and quality of cotton depend on diversity within the genetic resources used in the breeding process. Modern Acala, Upland, and Pima cottons are regarded as relatively low in genetic variation. Ten Gossypium hirsutum and ten G. barbadense improved germplasm have been assayed with 202 RFLP, 217 SSR, and 330 RAPD molecular markers. Preliminary data from the SSR markers showed that the diversity within the Acala cottons was approximately 18%, and within two Pima cultivars, PS 4 vs. PS 6, was approximately 16%. We will further discuss and present information confirming at the molecular level the narrow genetic base of improved germplasm within the two species, as well as p-distance difference among molecular markers. Results from the investigation confirm the need to broaden the germplasm base of improved cotton to ensure genetic diversity and increase the potential for genetic improvement.


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