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LEAF RUST DEVELOPMENT IN VARIOUS CULTIVARS OF WHEAT CARRYING DIFFERENT KNOWN GENES FOR RESISTANCE

A.A. HAKRO, M. ASLAM AND A.K. KHANZADA

Abstract: Wheat cultivars Punjab 76 (Lr1), Chenab 70 (Lr13), Khyber 79 (Lr13), ZA-77 (Lr1 + 13), Faisalabad 83 (Lr+13), Lyallpur 73 (Lr1+13), Pari-73 (Lr1+13), Sandal (Lr1+13), Sindh 81 (Lr1 + 13). Yecora (Lr1 + 13), Zamindar (Lr1 + 13), Zarghoon (Lr1), Arz (Lr3 + 13), Barani 83 (Lr3 + 13), Punjab 81 (U13 + ) and Morocco (without gene) for leaf rust resistance were induded in the test. The plants 45 days after planting were inoculated through spraying with aqueous suspension of uredospores of Puccinia rccondita. Leaf rust epidemic was first observed early in February on Morocco which does not carry any known gene for resistance. The start of the disease on the cultivars carrying one or other gene (s) for resistance were delayed by one to three weeks. Similarly the rate of development of the disease per unit time was also slower on cultivars carrying a gene for resistance than on the one without any knwon gene for resistance.

Crop Diseases Research Institute, Pakistan Agricultural Research Council, Karachi-75270, Pakistan.