PJB-2009-215
VIRULENCE ANALYSIS OF PUCCINIA TRITICINIA CAUSE OF LEAF RUST OF WHEAT
A. R. RATTU1, I. AHMAD1, M. FAYYAZ1, M. A. AKHTAR1, IRFAN-UL-HAQUE2*, M. ZAKRIA1 AND SYED NADEEM AFZAL2
Abstract
Virulence analysis of wheat provides breeders early information about the behavior of their material. Survey of wheat leaf rust using seedling differentials are very useful in describing virulence variation, geographical distribution of virulence pathotypes, and how leaf rust phenotypes change in response to host selection. Wheat leaf rust samples collected from the different wheat growing areas of Pakistan and single spore culture was multiplied for virulence analysis. Very high virulence frequencies (75-100%) showed by the resistance genes Lr1, Lr2a, Lr2b, Lr2c, Lr3, Lr3ka, Lr3bg, Lr10, Lr11, Lr14a, Lr14b, Lr15, Lr17, Lr18, Lr21, Lr23, Lr25, Lr26, Lr30, Lr32, Lr33, Lr35, Lr37 and LrB. Resistance genes Lr9, Lr19, Lr28 and Lr34 demonstrated their effectiveness of pathogen population of Puccinia triticina. Lr13, Lr16, Lr24 and Lr29 falls in 51-75% virulence frequencies range. Lr36 and Lr23+ showed the virulence in the range 26-50%. Virulence frequencies at different locations in the country and utilization of this data for wheat improvement is discussed
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