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Genetics of leaf rust resistance in three Americano landrace‐derived wheat cultivars from Uruguay
Author(s) -
Kolmer J. A.,
Oelke L. M.,
Liu J. Q.
Publication year - 2007
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2007.01283.x
Subject(s) - biology , rust (programming language) , cultivar , seedling , backcrossing , wheat leaf rust , poaceae , agronomy , horticulture , resistance (ecology) , gene , botany , genetics , virulence , computer science , programming language
A genetic analysis of the landrace‐derived wheat accessions Americano 25e, Americano 26n, and Americano 44d, from Uruguay was conducted to identify the leaf rust resistance genes present in these early wheat cultivars. The three cultivars were crossed with the leaf rust susceptible cultivar ‘Thatcher’ and approximately 80 backcross (BC1) F 2 families were derived for each cross. The BC1F 2 families and selected BC1F 4 lines were tested for seedling and adult plant leaf rust resistance with selected isolates of leaf rust, Puccinia triticina . The segregation and infection type data indicated that Americano 25e had seedling resistance genes Lr3 , Lr16 , an additional unidentified seedling gene, and one adult plant resistance gene that was neither Lr12 nor Lr13 , and did not phenotypically resemble Lr34 . Americano 26n was postulated to have genes Lr11 , Lr12 , Lr13 , and Lr14a . Americano 44d appeared to have two possibly unique adult plant leaf rust resistance genes.