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CURRENT STATUS OF THE OCCURRENCE AND DISTRIBUTION OF (PUCCINIA TRITICINA) WHEAT LEAF RUST VIRULENCE IN PAKISTAN
Abstract
Leaf rust caused by Puccinia triticina Eriks & Henn., is a serious fungal wheat disease of global occurrence. In order to determine its presence and virulence distribution within Pakistan, a trap nursery comprising of 39 isogenic wheat lines and 12 commercial bread wheat varieties carrying different Lr genes were planted and evaluated at 5 locations over 2 consecutive crop cycles; 2004-05 and 2005-06. The study objectives were to identify the naturally prevailing leaf rust virulences. Entries with leaf rust genes Lr9, Lr19 and Lr28 were resistant at all locations. Leaf rust genes Lr1, Lr2a, Lr2b, Lr2c, Lr3, Lr3ka, Lr3bg, Lr10, Lr11, Lr12, Lr14b, Lr15, Lr16, Lr17, Lr18, Lr20, Lr21, Lr23, Lr24, Lr25, Lr26, Gatcher (10
