Inheritance of leaf rust resistance in wheat lines carrying Aegilops speltoides Tausch. translocation in Chinese Spring background.
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 gene Lr28. Some seedlings of CS 2A/2M 4/2 were susceptible to Indian Puccinia 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 be Lr28, whereas line CS 2A/2M 4/2 was heterogeneous for Lr28. The adult-plant resistance in the CS 2A/2M 4/2 APR selection was conferred by an unknown recessive gene.
Bansal
Urmil K
UK
Department of Plant Breeding, Genetics & Biotechnology, Punjab Agricultural University, Ludhiana, India. U.Bansal@usyd.edu.au
Saini
Ram G
RG
Khanna
Renu
R
D005658:Fungi / Q000472:pathogenicity*; D018515:Plant Leaves / Q000382:microbiology*; D014178:Translocation, Genetic; D014908:Triticum / Q000235:genetics*