Submitted to: Plant and Animal Genome Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 11/4/2009
Publication Date: 1/9/2010
Citation: Zhang, J., Li, P., Zhao, W., Chu, C., Souza, E.J., Zemetra, R., Chen, J. 2010. Identifying Quantitative Trait Loci For Three Physiological Traits And Grain Yield In A Recombination Inbred Line Population Of Wheat (Triticum aestivum L.). Plant and Animal Genome Conference Proceedings, Jan 9-13, 2010, San Diego, CA. Available at http://www.intl-pag.org/18/abstracts/P05c_PAGXVIII_272.html. Interpretive Summary:
Technical Abstract: Drought can severely limit wheat production and is difficult to address through genetic improvement. The genetic mechanisms controlling drought related traits are ambiguous and poorly understood. The objective of this study is to identify QTL and molecular markers that are associated with canopy temperature (CT), chlorophyll content (CPC), green flag leaf retention (GFLR), and grain yield in a population consisted of 179 F7:8 recombinant inbred lines (RILs) derived from a cross between a drought sensitive cultivar ‘Rio Blanco’ and a drought tolerant Idaho germplasm IDO444. The parental lines and RILs were grown under normal water management prior to flowering and then drought-stressed from grain filling to maturity in Aberdeen, Idaho. Following anthesis, CT was measured once a week for two weeks post-anthesis, CPC was measured once a week for three weeks post-anthesis, and GFLR was measured visually once a week until physiological maturity was achieved. Four hundred SSRs and DArT markers were used in mapping of the traits. Based on single regression analysis, QTL for CT were mapped on eight chromosomes 1B, 2A, 2D, 3A, 3B, 4A, 5B, and 6D; while QTL for CPC were mapped on three chromosomes 2D, 3A, and 5B, and GFLR was mapped on three chromosomes 2B, 4B, and 5B. QTL for grain yield were mapped on three chromosomes 2B, 3A, and 4B, of which two are the same as GFLR and one same as CPC and CT. Refinement and utilization of these QTL should lead to improved efficiency of selection for drought tolerance in wheat.