|Ordonez, M - UNIVERSITY OF MINNESOTA|
|Groth, J - UNIVERSITY OF MINNESOTA|
Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: May 1, 2004
Publication Date: July 31, 2004
Citation: Ordonez, M.E., Kolmer, J.A., Groth, J.V. 2004. Virulence specificities of world wide collections of Puccinia triticina from durum wheat [abstract]. Phytopathology. 94:S79. Technical Abstract: Leaf rust caused by Puccinia triticina is an important disease of wheat. Resistance in durum wheat has been durable compared to the short-lived resistance of bread wheat cultivars. Recently, durum leaf rust has become more prevalent in several parts of the world. To determine race composition of the rust, collections of P. triticina on durum wheat from six countries were analyzed for virulence specificities on 36 isogenic lines of Thatcher wheat, that differ for single leaf rust resistance genes, and 24 cultivars of durum wheat. Collections from Argentina, France, Mexico, and California had high infection types on all durum cultivars and on Lr10, Lr14b Lr23, Lr33 and Lr41. These genes are likely derived from the AABB wheats, except Lr41. Isolates from Chile and Northern USA had virulence specificities similar to leaf rust races collected from bread wheats, and had lower infection types on the durum cultivars. Collections from Ethiopia showed unique virulence specificities on the durum and bread wheat differential sets.