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Races of P. graminis f. sp. tritici with virulence to Sr13 and Sr9e Olivera PD, Yahyaoui A, Badebo A, Rattu A, Rouse M, Ward R, Singh R, Fetch T, and Jin.

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Presentation on theme: "Races of P. graminis f. sp. tritici with virulence to Sr13 and Sr9e Olivera PD, Yahyaoui A, Badebo A, Rattu A, Rouse M, Ward R, Singh R, Fetch T, and Jin."— Presentation transcript:

1 Races of P. graminis f. sp. tritici with virulence to Sr13 and Sr9e Olivera PD, Yahyaoui A, Badebo A, Rattu A, Rouse M, Ward R, Singh R, Fetch T, and Jin Y North American Rust Workshop St. Paul - June 12, 2011

2 Stem Rust Resistance in Durum ● Durum wheat of North America has a higher frequency of resistance to TTKSK than common wheat to TTKSK than common wheat ● We postulated that resistance to TTKSK in durum is mostly due to Sr13 ● When durum resistant selections were evaluated in Debre Zeit, many were evaluated in Debre Zeit, many became susceptible to stem rust became susceptible to stem rust ● Hypothesis: stem rust races in Debre Zeit may possess a virulence combination may possess a virulence combination that overcome the TTKSK resistance that overcome the TTKSK resistance Debre Zeit

3 Race Identification ● Samples - 41 samples of infected stems collected at Debre - 41 samples of infected stems collected at Debre Zeit stem rust screening nursery in 2009 Zeit stem rust screening nursery in 2009 ● 38 single pustule isolates - race-typed based on the NA differential set - race-typed based on the NA differential set - characterized on a set of 24 additional - characterized on a set of 24 additional resistant lines resistant lines ● Races: - 18 IsolatesTTKSK - 18 IsolatesTTKSK - 12 IsolatesJRCQC - 12 IsolatesJRCQC - 4 IsolatesTRTTF - 4 IsolatesTRTTF

4 Infection Types on North American Differential Set of Races JRCQC, TRTTF, and TTKSK GeneJRCQCTRTTFTTKSK Sr5;144 Sr21443+ Sr9e43+4 Sr7b23+4 Sr11444 Sr63+3+3+ Sr8a22+24 Sr9g444 Sr3603+0 Sr9b 2+44GeneJRCQCTRTTFTTKSKSr3022-43+ Sr17+1333+22+ Sr9a3+44 Sr9d444 Sr101+3;44 SrTmp2-42+ Sr242-22- Sr312-2-4 Sr38;144 McN444

5 Infection Types Produced by Races JRCQC, TRTTF, and TTKSK on Sr13 and Sr9e JRCQC TRTTF TTKSK Sr13 Sr9e

6 Reaction of Race JRCQC in Durum Cultivars 8155-B28155-B1Iumillo-1Mindum Leeds Sceptre Medora Rusty KhapliVernalKubanka47-1SpelmarMindumSt464AcmeArnaukta

7 Infection types on 1AL.1RS of races JRCQC, TRTTF, and TTKSK GeneJRCQCTRTTFTTKSK 1AL.1RS2-322+ JRCQC TRTTF

8 Race TRTTF ● Race TRTTF was first found in a collection from Yemen in 2006 ● TRTTF is similar to race RRTTF that was found from stem rust collections from Pakistan collections from Pakistan ● Race RRTTF is avirulent to Sr9e and 1AL.1RS translocation

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