Talajoor Mina, Jin Yue, Wan Anmin, Chen Xianming, Bhavani Sridhar, Tabe Linda, Lagudah Evans, Huang Li
First and eighth authors: Montana State University, Department of Plant Sciences and Plant Pathology, Bozeman 59717-3150; second author: Cereal Disease Laboratory, United State Department of Agriculture-Agricultural Research Service (USDA-ARS), St. Paul, MN 55108; third and fourth authors: Wheat Genetics, Physiology, Quality, and Disease Research Unit, USDA-ARS, Pullman, WA 99164-6430; fifth author: International Maize and Wheat Improvement Center (CIMMYT), ICRAF House, United Nations Avenue, Gigiri, P.O. Box 1041, Village Market 00621, Nairobi, Kenya; and sixth and seventh authors: CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia.
Phytopathology. 2015 Apr;105(4):477-81. doi: 10.1094/PHYTO-09-14-0261-R.
The spring wheat 'Canthatch' has been shown to suppress stem rust resistance genes in the background due to the presence of a suppressor gene located on the long arm of chromosome 7D. However, it is unclear whether the suppressor also suppresses resistance genes against leaf rust and stripe rust. In this study, we investigated the specificity of the resistance suppression. To determine whether the suppression is genome origin specific, chromosome location specific, or rust species or race specific, we introduced 11 known rust resistance genes into the Canthatch background, including resistance to leaf, stripe, or stem rusts, originating from A, B, or D genomes and located on different chromosome homologous groups. F1 plants of each cross were tested with the corresponding rust race, and the infection types were scored and compared with the parents. Our results show that the Canthatch 7DL suppressor only suppressed stem rust resistance genes derived from either the A or B genome, and the pattern of the suppression is gene specific and independent of chromosomal location.
春小麦品种“Canthatch”已被证明，由于位于7D染色体长臂上的一个抑制基因的存在，它会抑制背景中的茎锈病抗性基因。然而，尚不清楚该抑制基因是否也会抑制针对叶锈病和条锈病的抗性基因。在本研究中，我们调查了抗性抑制的特异性。为了确定这种抑制是基因组来源特异性、染色体定位特异性，还是锈病物种或生理小种特异性，我们将11个已知的锈病抗性基因导入Canthatch背景中，这些基因包括对叶锈病、条锈病或茎锈病的抗性，它们源自A、B或D基因组，且位于不同的染色体同源群上。每个杂交组合的F1植株都用相应的锈病生理小种进行测试，对侵染类型进行评分，并与亲本进行比较。我们的结果表明，Canthatch 7DL抑制基因仅抑制源自A或B基因组的茎锈病抗性基因，且这种抑制模式具有基因特异性，与染色体定位无关。
