PJB-2002-12
LEAF RUST DEVELOPMENT ON WHEAT CULTIVARS WITH AND WITHOUT LR. GENES
A.A. HAKRO, S. A. JAMIL KHAN AND S.A.H. JAFFRY
Abstract
Wheat leaf rust (Puccinia recondita) development on wheat cultivars carrying known Lr. genes viz., Blue Silver (Lr13+), Lyallpur-73 (Lr1+Lr13+), Rawal-87 (Lr26), WL-711 (Lr13+Lr15) and Pak-81 (Lr26); and those without Lr genes viz., Local White, Mexi-Pak, Morocco, Pak-70; as well as near isogenic lines carrying Lr13, Lr16, Lr26, Lr1+Lr13, Lr13+Lr26+Slow rusting genes were examined under field conditions at the CDRI, PARC, Karachi University Campus, Karachi. Wheat varieties were artificially inoculated with aqueous suspension of a mixture of urediospore (Puccinia recondita) in the last week of January when the wheat plants were 50 days old. Leaf rust development started in the second week of February 2001 on Local White, Mexi-Pak and Morocco. Development of rust on varieties carrying Lr genes delayed rust infection by 10 days under field conditions. Similarly the rate of development of rust per unit time also differed on varieties carrying different Lr genes.
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