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Euphytica

, Volume 179, Issue 1, pp 119–127 | Cite as

Characterization of two new Puccinia graminis f. sp. tritici races within the Ug99 lineage in South Africa

  • Botma VisserEmail author
  • Liezel Herselman
  • Robert F. Park
  • Haydar Karaoglu
  • Cornelia M. Bender
  • Zacharias A. Pretorius
Article

Abstract

Two new races of the wheat (Triticum aestivum L.) stem rust pathogen, representing the fifth and sixth variants described within the Ug99 lineage, were detected in South Africa. Races TTKSP and PTKST (North American notation) were detected in 2007 and 2009, respectively. Except for Sr24 virulence, race TTKSP is phenotypically identical to TTKSF, a commonly detected race of Puccinia graminis f. sp. tritici (Pgt) in South Africa. PTKST is similar to TTKSP except that it produces a lower infection type on the Sr21 differential and has virulence for Sr31. Simple sequence repeat (SSR) analysis confirmed the genetic relationship amongst TTKSF, TTKSP, PTKST and TTKSK (Ug99). TTKSK, PTKST and TTKSF grouped together with 99% similarity, while sharing 88% genetic resemblance with TTKSP. These four races in turn shared only 31% similarity with other South African races. It is proposed that both TTKSP and PTKST represent exotic introductions of Pgt to South Africa.

Keywords

Pathotype Stem rust Triticum aestivum Wheat TTKSK 

Notes

Acknowledgments

The Winter Cereal Trust is acknowledged for funding this project.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Botma Visser
    • 1
    Email author
  • Liezel Herselman
    • 1
  • Robert F. Park
    • 2
  • Haydar Karaoglu
    • 2
  • Cornelia M. Bender
    • 1
  • Zacharias A. Pretorius
    • 1
  1. 1.Department of Plant SciencesUniversity of the Free StateBloemfonteinSouth Africa
  2. 2.Plant Breeding Institute CobbittyThe University of SydneyCamdenAustralia

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