Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 2006
Publication Date: July 1, 2006
Citation: Jin, Y. 2006. Inheritance of Resistance to Race TTKS of Puccinia graminis f. sp. tritici in Spring Wheat. Phytopathology. 96:S55. Technical Abstract: Race TTKS (or Ug99) of Puccinia graminis f. sp. tritici, present in eastern Africa, is virulent to many stem rust resistance genes present in wheat cultivars worldwide. Spring wheat cultivars Ivan, Keene and Stoa, and breeding lines SD3746 and 97S0254-8-1, were found to be resistant to race TTKS based on seedling tests. The inheritance of resistance to race TTKS was investigated using F(2) and BC(1)F(2) populations of the resistant lines crossed with susceptible genotypes Chinese Spring and/or LMPG-6. The TTKS resistance in Ivan, Keene, Stoa, SD3746, and 97S0254-8-1 was controlled by a single dominant gene. F(2) populations of intercrosses among Keene, Stoa, SD3746, and 97S0254-8-1 did not segregate, indicating that they share the same resistance gene. F(2) populations of Ivan crossed with Keene, Stoa, and 97S0254-8-1 segregated for resistance and susceptibility. A linkage (with a recombination fraction of 31.5%) was detected between the resistance gene in Ivan and the resistance gene in Keene, Stoa, and 97S0254-8-1. These sources of resistance could be used to develop wheat cultivars with resistance to race TTKS.