Inheritance of leaf rust resistance in wheat lines carryingAegilops speltoides Tausch. translocation in Chinese Spring background
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The genetic basis of seedling and adult-plant leaf rust resistance was analysed in wheat lines CS 2A/2M 4/2 and CS 2D/2M 3/8, which are reference lines for the leaf rust resistance geneLr28. Some seedlings of CS 2A/2M 4/2 were susceptible to IndianPuccinia triticina (Pt) pathotypes 77-1,77-2 and 77-5. These susceptible seedlings exhibited resistance at the adult-plant growth stage. In contrast, CS 2D/2M 3/8 showed resistance to all Pt pathotypes both at the seedling and adult-plant growth stages. The analysis of inheritance in the susceptible plants of CS 2A/2M 4/2 (CS 2A/2M 4/2 APR selection) and CS 2D/2M 3/8 against Pt 77-5 (the frequently occurring Pt pathotype from the Indian subcontinent), indicated that line CS 2D/2M 3/8 was fixed for a dominant gene, presumed to beLr28, whereas line CS 2A/2M 4/2 was heterogeneous forLr28. The adult-plant resistance in the CS 2A/2M 4/2 APR selection was conferred by an unknown recessive gene.
KeywordsAegilops comosa Aegilops speltoides leaf rust resistance Puccinia triticina Triticum aestivum
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