Genetic characterization of adult-plant resistance to tan spot (syn, yellow spot) in wheat.

Autor: Dinglasan EG; Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia., Peressini T; Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia., Marathamuthu KA; Centre for Crop and Disease Management, Curtin University, Perth, WA, Australia., See PT; Centre for Crop and Disease Management, Curtin University, Perth, WA, Australia., Snyman L; Department of Agriculture and Fisheries, Hermitage Research Facility, Warwick, QLD, Australia., Platz G; Department of Agriculture and Fisheries, Hermitage Research Facility, Warwick, QLD, Australia., Godwin I; Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia., Voss-Fels KP; Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia., Moffat CS; Centre for Crop and Disease Management, Curtin University, Perth, WA, Australia., Hickey LT; Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia. l.hickey@uq.edu.au.
Jazyk: angličtina
Zdroj: TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik [Theor Appl Genet] 2021 Sep; Vol. 134 (9), pp. 2823-2839. Date of Electronic Publication: 2021 Jun 01.
DOI: 10.1007/s00122-021-03861-8
Abstrakt: Key Message: QTL mapping identified key genomic regions associated with adult-plant resistance to tan spot, which are effective even in the presence of the sensitivity gene Tsn1, thus serving as a new genetic solution to develop disease-resistant wheat cultivars. Improving resistance to tan spot (Pyrenophora tritici-repentis; Ptr) in wheat by eliminating race-specific susceptibility genes is a common breeding approach worldwide. The potential to exploit variation in quantitative forms of resistance, such as adult-plant resistance (APR), offers an alternative approach that could lead to broad-spectrum protection. We previously identified wheat landraces in the Vavilov diversity panel that exhibited high levels of APR despite carrying the sensitivity gene Tsn1. In this study, we characterised the genetic control of APR by developing a recombinant inbred line population fixed for Tsn1, but segregating for the APR trait. Linkage mapping using DArTseq markers and disease response phenotypes identified a QTL associated with APR to Ptr race 1 (producing Ptr ToxA- and Ptr ToxC) on chromosome 2B (Qts.313-2B), which was consistently detected in multiple adult-plant experiments. Additional loci were also detected on chromosomes 2A, 3D, 5A, 5D, 6A, 6B and 7A at the seedling stage, and on chromosomes 1A and 5B at the adult stage. We demonstrate that Qts.313-2B can be combined with other adult-plant QTL (i.e. Qts.313-1A and Qts.313-5B) to strengthen resistance levels. The APR QTL reported in this study provide a new genetic solution to tan spot in Australia and could be deployed in wheat cultivars, even in the presence of Tsn1, to decrease production losses and reduce the application of fungicides.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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