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Norman M, Chen C, Miah H, Patpour M, Sørensen C, Hovmøller M, Forrest K, Kumar S, Prasad P, Gangwar OP, Bhardwaj S, Bariana H, Periyannan S, Bansal U. Sr65: a widely effective gene for stem rust resistance in wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 137:1. [PMID: 38071267 DOI: 10.1007/s00122-023-04507-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 11/15/2023] [Indexed: 12/18/2023]
Abstract
KEY MESSAGE Sr65 in chromosome 1A of Indian wheat landrace Hango-2 is a potentially useful all-stage resistance gene that currently protects wheat from stem rust in Australia, India, Africa and Europe. Stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), threatened global wheat production with the appearance of widely virulent races that included TTKSK and TTRTF. Indian landrace Hango-2 showed resistance to Pgt races in India and Australia. Screening of a Hango-2/Avocet 'S' (AvS) recombinant inbred line population identified two stem rust resistance genes, a novel gene (temporarily named as SrH2) from Hango-2 and Sr26 from AvS. A mapping population segregating for SrH2 alone was developed from two recombinant lines. SrH2 was mapped on the short arm of chromosome 1A, where it was flanked by KASP markers KASP_7944 (proximal) and KASP_12147 (distal). SrH2 was delimited to an interval of 1.8-2.3 Mb on chromosome arm 1AS. The failure to detect candidate genes through MutRenSeq and comparative genomic analysis with the pan-genome dataset indicated the necessity to generate a Hango-2 specific assembly for detecting the gene sequence linked with SrH2 resistance. MutRenSeq however enabled identification of SrH2-linked KASP marker sunCS_265. Markers KASP_12147 and sunCS_265 showed 92% and 85% polymorphism among an Australian cereal cultivar diversity panel and can be used for marker-assisted selection of SrH2 in breeding programs. The effectiveness of SrH2 against Pgt races from Europe, Africa, India, and Australia makes it a valuable resource for breeding stem rust-resistant wheat cultivars. Since no wheat-derived gene was previously located in chromosome arm 1AS, SrH2 represents a new locus and named as SR65.
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Affiliation(s)
- Michael Norman
- Plant Breeding Institute, School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, 107 Cobbitty Road, Cobbitty, NSW, 2570, Australia
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, Canberra, ACT, 2601, Australia
| | - Chunhong Chen
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, Canberra, ACT, 2601, Australia
| | - Hanif Miah
- Plant Breeding Institute, School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, 107 Cobbitty Road, Cobbitty, NSW, 2570, Australia
| | - Mehran Patpour
- Department of Agroecology, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark
| | - Chris Sørensen
- Department of Agroecology, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark
| | - Mogens Hovmøller
- Department of Agroecology, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark
| | - Kerrie Forrest
- Agriculture Victoria, Department of Energy, Environment and Climate Action, AgriBio, Centre for AgriBioscience, 5 Ring Rd., Bundoora, VIC, 3083, Australia
| | - Subodh Kumar
- Indian Council of Agricultural Research - Indian Institute of Wheat and Barley Research Regional Station, Flowerdale, Shimla, Himachal Pradesh, 171 002, India
| | - Pramod Prasad
- Indian Council of Agricultural Research - Indian Institute of Wheat and Barley Research Regional Station, Flowerdale, Shimla, Himachal Pradesh, 171 002, India
| | - Om Prakash Gangwar
- Indian Council of Agricultural Research - Indian Institute of Wheat and Barley Research Regional Station, Flowerdale, Shimla, Himachal Pradesh, 171 002, India
| | - Subhash Bhardwaj
- Indian Council of Agricultural Research - Indian Institute of Wheat and Barley Research Regional Station, Flowerdale, Shimla, Himachal Pradesh, 171 002, India
| | - Harbans Bariana
- Plant Breeding Institute, School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, 107 Cobbitty Road, Cobbitty, NSW, 2570, Australia
- School of Science, Western Sydney University, Bourke Road, Richmond, NSW, 2753, Australia
| | - Sambasivam Periyannan
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, Canberra, ACT, 2601, Australia.
- School of Agriculture and Environmental Science, Centre for Crop Health, University of Southern Queensland, West Street, Toowoomba, QLD, 4350, Australia.
| | - Urmil Bansal
- Plant Breeding Institute, School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, 107 Cobbitty Road, Cobbitty, NSW, 2570, Australia.
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