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Title: Specificity of a rust resistance suppressor on 7DL in the spring wheat cultivar Canthatch

Author
item TALAJOOR, M - Montana State University
item Jin, Yue
item WAN, A - Washington State University
item Chen, Xianming
item BHAVANI, S - International Maize & Wheat Improvement Center (CIMMYT)
item TABE, L - Commonwealth Scientific And Industrial Research Organisation (CSIRO)
item LAGUDAH, E - Commonwealth Scientific And Industrial Research Organisation (CSIRO)
item HUANG, L - Montana State University

Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/30/2014
Publication Date: 4/1/2015
Citation: Talajoor, M., Jin, Y., Wan, A.M., Chen, X., Bhavani, S., Tabe, L., Lagudah, E., Huang, L. 2015. Specificity of a rust resistance suppressor on 7DL in the spring wheat cultivar Canthatch. Phytopathology. 105:477-481.

Interpretive Summary: 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. 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. The F1 progeny plants of each cross were tested with the corresponding rust race, and the infection types were 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.

Technical Abstract: 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.