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ARS Home » Midwest Area » St. Paul, Minnesota » Cereal Disease Lab » Research » Publications at this Location » Publication #314984
Title: The Lr46 gene conditions partial adult-plant resistance to yellow rust, stem rust, and powdery mildew in Thatcher wheat

Author
item Kolmer, James
item LAGUDAH, E - Commonwealth Scientific And Industrial Research Organisation (CSIRO)
item LILLEMO, M - Norwegian University Of Life Sciences
item LIN, M - Kansas State University
item Bai, Guihua

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/1/2015
Publication Date: 10/19/2015
Citation: Kolmer, J.A., Lagudah, E.S., Lillemo, M., Lin, M., Bai, G. 2015. The Lr46 gene conditions partial adult-plant resistance to yellow rust, stem rust, and powdery mildew in Thatcher wheat. Crop Science. 55:2557-2565. doi: 10.2135/cropsci2015.02.0082.

Interpretive Summary: Wheat is attacked by a fungus called Puccinia triticina, which is the scientific name of the fungus that causes the disease wheat leaf rust. This disease occurs in the U.S. and world wide. A gene in wheat that gives resistance to leaf rust, was also found to give resistance to the pathogens that cause the stem rust, yellow rust, and powdery mildew diseases. This gene can be used by wheat breeders to develop new wheat cultivars with resistance to four different diseases.

Technical Abstract: Disease resistance is a critical goal for many wheat improvement programs. Wheat cultivars are often attacked by multiple diseases, including the rusts and powdery mildew. F6 recombinant inbred lines (RILs) derived from the cross of Thatcher*3/CI13227 that had been previously characterized as having the adult plant leaf rust resistance gene Lr46, were further tested for resistance to yellow rust, stem rust and powdery mildew. In field plot tests, the RILs segregated for resistance to yellow rust, stem rust and powdery mildew, with the highest logarithm of odds (LOD) peak at the sequence tagged site marker csLV46, which is closely linked to Lr46 on chromosome 1BL. Marker csLV46 had the highest LOD scores and R2 values for powdery mildew resistance, followed by yellow rust and leaf rust resistance. Tests for stem rust resistance had the lowest LOD scores. An additional quantitative trait locus (QTL) for leaf rust resistance derived from CI13227 on chromosome 7AL was detected in two of the three leaf rust tests. A QTL for stem rust resistance on chromosome 7AL derived from Thatcher was detected in two of the three stem rust tests.