ARS | Publication request: New source of TTKSK resistance derived from Thinopyrum and Aegilops species

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: February 20, 2009
Publication Date: March 17, 2009
Citation: Xu, S.S., Jin, Y. 2009. New source of TTKSK resistance derived from Thinopyrum and Aegilops species. pg. 18. In: Poster Abstract of Borlaug Global Rust Initiative (BGRI) 2009 Technical Workshop Cuidad Obregon, Sonora, Mexico, March 17-20, 2009 Meeting Abstract

Technical Abstract: Several stem rust resistance genes of Thinopyrum and Aegilops origins appeared to be highly effective against race TTKSK (or Ug99) of Puccinia graminis f. sp. tritici. We evaluated and characterized the seedling resistance to TTKSK of 62 wheat lines derived from crosses of common or durum wheat with wild species Thinopyrum junceum, Th. intermedium, Th. bessarabicum, Th. elongatum, Th. ponticum, Aegilops caudata, and Ae. speltoides. The results showed that 34 wheat-alien species derivatives had resistance to TTKSK. Comparisons of the wheat-alien species derivatives and their parental lines for reactions to different stem rust races suggested that several lines, including seven wheat-Th. intermedium amphiploids, one wheat-Th. ponticum amphiploid, six durum-Ae. speltoides amphiploids, one wheat-Th. junceum disomic addition line, two wheat-Ae. caudata disomic addition lines, and a wheat-Th. bessarabicum 7J disomic addition line, may carry novel genes for TTKSK resistance. These lines will be useful for introducing novel stem rust resistance genes into wheat. Research efforts are currently underway to introduce the resistance genes into wheat genomes through ph1b-induced homoeologous recombination.