McCartney C A, Somers D J, Fedak G, Cao W
Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9 , Canada.
Theor Appl Genet. 2004 Jul;109(2):261-71. doi: 10.1007/s00122-004-1640-x. Epub 2004 Apr 1.
Fusarium head blight (FHB) reduces grain yield and quality in common and durum wheat. Host FHB resistance is an effective control measure that is achieved by stacking multiple resistance genes into a wheat line. Therefore, breeders would benefit from knowing which resistance sources carry different resistance genes. A diverse collection of FHB-resistant and -susceptible wheat lines was characterized with microsatellite markers linked to FHB resistance quantitative trait loci (QTLs) on chromosomes 2DL, 3BS (distal to the centromere), 3BSc (proximal to the centromere), 4B, 5AS and 6BS identified in wheat lines Maringa, Sumai 3 and Wuhan 1. Putative Sumai 3 QTLs were commonly observed in advanced breeding lines, whereas putative Maringa and Wuhan 1 QTLs were relatively rare. Marker data suggested the 3BS, 3BSc and 5AS QTLs in the Brazilian cv. Maringa were derived from Asian germplasm and not from Frontana or other Brazilian lines. Haplotype diversity was reduced near the 5AS QTL, which might impact the deployment of this QTL. Finally, Brazilian germplasm was not closely related to other resistance sources and might be useful for pyramiding with Asian wheat-derived FHB resistance.
小麦赤霉病（FHB）会降低普通小麦和硬粒小麦的籽粒产量和品质。寄主对FHB的抗性是一种有效的防治措施，可通过将多个抗性基因导入小麦品系来实现。因此，育种者若能了解哪些抗性来源携带不同的抗性基因将大有裨益。利用与在小麦品系Maringa、苏麦3号和武汉1号中鉴定出的位于2DL、3BS（着丝粒远端）、3BSc（着丝粒近端）、4B、5AS和6BS染色体上的FHB抗性数量性状位点（QTL）连锁的微卫星标记，对多种抗FHB和感FHB的小麦品系进行了特征分析。在先进育种品系中普遍观察到推测的苏麦3号QTL，而推测的Maringa和武汉1号QTL相对较少。标记数据表明，巴西品种Maringa中的3BS、3BSc和5AS QTL源自亚洲种质，而非Frontana或其他巴西品系。5AS QTL附近的单倍型多样性降低，这可能会影响该QTL的应用。最后，巴西种质与其他抗性来源关系不密切，可能有助于与源自亚洲小麦的FHB抗性进行基因聚合。
