Submitted to: ASA-CSSA-SSSA Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 11/3/2003
Publication Date: 11/3/2003
Citation: STEWART, J.M., ULLOA, M., GARCIA-CASTANEDA, E., GODOY-AVILA, S. 2003. COLLECTION OF COTTON GERMPLASM IN THE CENTRAL PACIFIC STATES OF MEXIC0.. ASA-CSSA-SSSA PROCEEDINGS. p. 213.
Technical Abstract: Mexico is the center of origin and diversity of cotton (Gossypium hirsutum) and a center of diversity for the genus Gossypium with 12 of the 14 New World diploid species. An effort is under way to systematically determine the status of the cotton landraces and to collect germplasm representative of the remaining diversity. In addition, an effort is being made to collection the diploid species from across their range. A previous expedition covered the southern states of Mexico. This paper reports the results of an expedition through the central Pacific coastal states. As in the southern states, the former landraces of cotton remain only as occasional garden plants. Collection of the diploid species resulted in a significant increase in the known ranges of G. laxum and G. lobatum. Gossypium aridum, as currently circumscribed, is distributed from Sinaloa to Oaxaca along the Pacific slope. The most recent expedition discovered distinct populations associated with both coastal and montane ecosystems. Also, a population was discovered on the eastern side of the Sierra Madre mountains. Morphological differences among ecologically distinct populations of G. aridum indicate that the taxonomic circumscription of the species should be re-examined with the new specimens now available for study.