TY - JOUR
T1 - Identification and mapping of expressed genes associated with the 2DL QTL for fusarium head blight resistance in the wheat line Wuhan 1
AU - Hu, Xinkun
AU - Rocheleau, Hélène
AU - McCartney, Curt
AU - Biselli, Chiara
AU - Bagnaresi, Paolo
AU - Balcerzak, Margaret
AU - Fedak, George
AU - Yan, Zehong
AU - Valè, Giampiero
AU - Khanizadeh, Shahrokh
AU - Ouellet, Thérèse
N1 - Publisher Copyright:
© 2019 The Author(s).
PY - 2019/5/21
Y1 - 2019/5/21
N2 - Background: Fusarium head blight (FHB) is a problem of great concern in small grain cereals, especially wheat. A quantitative trait locus (QTL) for FHB resistance (FHB-SFI) located on the long arm of chromosome 2D in the spring wheat genotype Wuhan 1 is a resistance locus which has potential to improve the FHB resistance of bread wheat since it confers effective resistance to wheat breeding lines. Recently, differentially expressed genes (DEG) have been identified by comparing near isogenic lines (NIL) carrying the susceptible and resistant alleles for the 2DL QTL, using RNA-Seq. In the present study, we aimed to identify candidate genes located within the genetic interval for the 2DL QTL for FHB resistance, as assessed by single floret inoculation (FHB-SFI), and possibly contributing to it. Results: Combining previous and additional bioinformatics analyses, 26 DEG that were located on chromosome arm 2DL were selected for further characterization of their expression profile by RT-qPCR. Seven of those DEG showed a consistent differential expression profile between either three pairs of near isogenic lines or other genotypes carrying the R and S alleles for the 2DL QTL for FHB resistance. UN25696, which was identified in previous expression work using microarray was also confirmed to have a differential expression pattern. Those eight candidate genes were further characterized in 85 lines of a double haploid mapping population derived from the cross Wuhan 1/Nyubai, the population where the 2DL QTL was originally identified. The expression QTL for gene Traes-2DL-179570792 overlapped completely with the mapping interval for the 2DL QTL for FHB-SFI while the expression QTL for UN25696 mapped near the QTL, but did not overlap with it. None of the other genes had a significant eQTL on chromosome 2DL. Higher expression of Traes-2DL-179570792 and UN25696 was associated with the resistant allele at that locus. Conclusions: Of the 26 DEG from the 2DL chromosome further characterized in this study, only two had an expression QTL located in or near the interval for the 2DL QTL. Traes-2DL-179570792 is the first expression marker identified as associated with the 2DL QTL.
AB - Background: Fusarium head blight (FHB) is a problem of great concern in small grain cereals, especially wheat. A quantitative trait locus (QTL) for FHB resistance (FHB-SFI) located on the long arm of chromosome 2D in the spring wheat genotype Wuhan 1 is a resistance locus which has potential to improve the FHB resistance of bread wheat since it confers effective resistance to wheat breeding lines. Recently, differentially expressed genes (DEG) have been identified by comparing near isogenic lines (NIL) carrying the susceptible and resistant alleles for the 2DL QTL, using RNA-Seq. In the present study, we aimed to identify candidate genes located within the genetic interval for the 2DL QTL for FHB resistance, as assessed by single floret inoculation (FHB-SFI), and possibly contributing to it. Results: Combining previous and additional bioinformatics analyses, 26 DEG that were located on chromosome arm 2DL were selected for further characterization of their expression profile by RT-qPCR. Seven of those DEG showed a consistent differential expression profile between either three pairs of near isogenic lines or other genotypes carrying the R and S alleles for the 2DL QTL for FHB resistance. UN25696, which was identified in previous expression work using microarray was also confirmed to have a differential expression pattern. Those eight candidate genes were further characterized in 85 lines of a double haploid mapping population derived from the cross Wuhan 1/Nyubai, the population where the 2DL QTL was originally identified. The expression QTL for gene Traes-2DL-179570792 overlapped completely with the mapping interval for the 2DL QTL for FHB-SFI while the expression QTL for UN25696 mapped near the QTL, but did not overlap with it. None of the other genes had a significant eQTL on chromosome 2DL. Higher expression of Traes-2DL-179570792 and UN25696 was associated with the resistant allele at that locus. Conclusions: Of the 26 DEG from the 2DL chromosome further characterized in this study, only two had an expression QTL located in or near the interval for the 2DL QTL. Traes-2DL-179570792 is the first expression marker identified as associated with the 2DL QTL.
KW - 2DL FHB resistance QTL
KW - Expression QTL
KW - Fusarium head blight
KW - RNA-Seq
KW - Wheat
KW - Wuhan 1
UR - http://www.scopus.com/inward/record.url?scp=85066412308&partnerID=8YFLogxK
U2 - 10.1186/s12863-019-0748-6
DO - 10.1186/s12863-019-0748-6
M3 - Article
SN - 1471-2156
VL - 20
JO - BMC Genetics
JF - BMC Genetics
IS - 1
M1 - 47
ER -