ARS | Publication request: Identification and mapping of QTLs for FHB resistance in a synthetic hexaploid wheat line

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: November 13, 2011
Publication Date: December 4, 2011
Citation: Zhong, S., Chu, C.G., Xu, S.S., Ali, S., Puri, K.D., Mergoum, M., Chao, S. 2011. Identification and mapping of QTLs for FHB resistance in a synthetic hexaploid wheat line. Meeting Abstract. pg 64.

Technical Abstract: The synthetic hexaploid wheat (SHW) lines derived from crosses between tetraploid wheat (AABB genome) and Aegilops tauschii (D genome) possess resistance to various diseases including Fusarium head blight (FHB). However, the genetics of FHB resistance in these synthetic lines is poorly understood. Based on two seasons of evaluation in the greenhouse, the SHW line TA4152-60 (Scoop1/Ae.tauschii [358]) developed by CYMMIT was found to exhibit a moderate level of resistance to FHB. To understand the genetics and QTL governing the FHB resistance in TA4152-60, a mapping population of 120 double haploid (DH) lines derived from the cross between TA4152-60 FHB and the hard red spring wheat line ND 495 (highly susceptible to FHB) was evaluated for FHB reaction in field and greenhouse. Based on the whole genome linkage maps developed using 643 DNA markers and the phenotype data from two seasons of greenhouse and one season of field experiments, two major QTLs were identified on chromosome 5A and 5B. The 5A QTL peaked at the interval between Xgdm132.1 and Xgwm410.4, and explained up to 11% of the phenotypic variation whereas the 5B QTL explained up to 20% of the trait variation and peaked at the interval between markers Xbarc100.5 and Xwmc75. Based on the chromosomal regions, the QTLs identified in our study appeared to be different from those that have been mapped in other sources of FHB resistance. Therefore, these QTLs may be useful for the improvement of FHB resistance in wheat breeding programs.