Identification and mapping of expressed genes associated with the 2DL QTL for fusarium head blight resistance in the wheat line Wuhan 1

BMC Genetics

Zehong Yan¹  Margaret Balcerzak²  Thérèse Ouellet²  Hélène Rocheleau²  Shahrokh Khanizadeh²  George Fedak²  Xinkun Hu³  Giampiero Valè⁴  Paolo Bagnaresi⁵  Chiara Biselli⁵  Curt McCartney⁶ 

[1] 0000 0001 0185 3134, grid.80510.3c, Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, 611130, Chengdu, Sichuan, People’s Republic of China;0000 0001 1302 4958, grid.55614.33, Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Ave, K1A 0C6, Ottawa, ON, Canada;0000 0001 1302 4958, grid.55614.33, Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Ave, K1A 0C6, Ottawa, ON, Canada;0000 0001 0185 3134, grid.80510.3c, Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, 611130, Chengdu, Sichuan, People’s Republic of China;0000000121663741, grid.16563.37, Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Vercelli, Italy;CREA, Council for Agricultural Research and Economics - Research Centre for Genomics and Bioinformatics, Via S. Protaso 302, I-29017, Fiorenzuola d’Arda, PC, Italy;Morden Research and Development Centre, Agriculture and Agri-Food Canada, 101 Route 100, Unit 100, R6M 1Y5, Morden, Manitoba, Canada;

关键词: Wheat;    Wuhan 1;    Fusarium head blight;    RNA-Seq;    Expression QTL;    2DL FHB resistance QTL;   

DOI  :  10.1186/s12863-019-0748-6

来源: publisher

【 摘 要 】

BackgroundFusarium 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.ResultsCombining 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.ConclusionsOf 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.

【 授权许可】

CC BY