Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 9/15/2005
Publication Date: 1/5/2006
Citation: Abdurakhmonov, I.Y., Buriev, Z.T., Kohel, R.J., Yu, J., Pepper, A.E., Rizaeva, S.M., Abdukarimov, A., Saha, S., Jenkins, J.N. 2006. Characterizaion of G. hirsutum wild and variety accessions from Uzbek cotton germplasm collection for morphological and fiber quality traits and database developement. In: Proceedings of the Beltwide Cotton Conferences, January 3-6, 2006, San Antonio, Texas. 2006 CDROM. Interpretive Summary:
Technical Abstract: Uzbek cotton germplasm is one of the largest cotton collections worldwide, and that vast collection is “unknown” to the world research community. The main goal of this project was to select G. hirsutum ‘exotic’ and variety accessions from Uzbekistan cotton germplasm collection, evaluate them for agronomic and morphological traits including fiber quality and yield properties in multiple environments, study genomic diversity within selected germplasm and ultimately determine potential new genes of improved agronomic and fiber traits through association genetics studies using molecular marker technology. We selected 1000 G. hirsutum wild and variety accessions representing at least 37 ecotypes from American, African, Asian, Australian, Central Asian, European, and Mexican geographic origin. These accessions were grown in field conditions of Uzbekistan and at least 14 morphobiological characteristics, fiber quality, and yield properties were phenotypically evaluated. Furthermore, these germplasm resources have been exchanged with USDA-ARS Crop Germplasm Unit at College Station, Texas, USA to evaluate and increase these accessions at Winter Cotton Nursery at Mexico. The fiber qualities were measured in HVI at Starlab, Inc., Knoxville, TN. Results revealed a wide gentic diversity in studied morphological and fiber quality traits in both Uzbekistan and Mexican growing environments. For example, cotton accessions had fiber length in a range of 0.82-1.29 inch, Micronaire in range of 2.9-8.8, and fiber strength in a range of 18.2-39.1 g/tex at Uzbekistan demonstrating a wide range of diversity in fiber quality. The fiber length varied in a range of 0.84-1.30 inch, Micronaire varied in a range of 2.3-8.6, and fiber strength varied in a range of 15.2-44.0 g/tex at Mexico. We developed an electronic database using pcGRIN (pcGRIN Data Management version 1.21) and Microsoft Access software that contains 72 characteristics for each accession, including passport data, collection data, plant data, and inflorescence and fruit data. Currently we are genotyping these accessions with a core set of SSR and chromosome-specific SSR markers to perform the genetic diversity and association genetics and linkage disequalibrum (LD) studies in cotton.