Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 2/6/2006
Publication Date: 5/6/2006
Citation: Hoffman, S., Kohel, R.J., Ulloa, M., Cho, J., Xu, Z., Smith, W., Pepper, A., Cantrell, R., Yu, J. 2006. Association analysis of morphological characters with molecular markers in a TM-1 x 3-79 RIL population grown in three diverse environments [abstract]. In: Proceedings of the Beltwide Cotton Conferences, January 3-6, 2006, San Antonio, Texas. 2006 CDROM. Interpretive Summary:
Technical Abstract: The TM-1 x 3-79 RIL population exhibited a great range of the variability seen throughout the Gossypium genus offering an opportunity to locate or map important morphological traits and fiber properties. Plant height, total node count, canopy density and number of vegetative branches were analyzed with SAS 8.0 Proc Mixed (The SAS Institute, Cary NC) over all three locations, allowing us to estimate the covariance associated with the RILs, the Environment x RIL interaction and the Environmental effect on each of the morphological traits. Plant height, number of vegetative branches, seed cotton yield, and number of bolls all exhibited the heritability that imply their usefulness for QTL mapping studies in this population. Stem diameters and the number of vegetative branches were significantly higher in the Burleson County than the Brazos county location indicating much greater allocation of biomass to vegetative growth as seen in the reduced lint yield at the Burleson county location. There were a wide variety of leaf shapes and morphologies. Flower morphology was completely consistent over all three locations with results consistent with those seen in the past with this RIL population. We are now associating these morphological characters with SSR molecular markers that have been mapped on this TM-1 x 3-79 RIL population. Cluster analysis with both newly developed SSRs and those publicly available markers was conducted on Nei’s genetic distance two main sub clusters do not have any apparent relation to simple % contribution from each parent.