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Mapping of a Novel source of non-race-specific leaf rust resistance in the CIMMYT wheat line Weebill 1

By: Seda, B.F.
Contributor(s): Anderson, J.A | Chao, S [coaut.] | Kolmer, J.A [coaut.] | Yue Jin [coaut.] | Zhang, J.X [coaut.] | Huerta-Espino, J [coaut.] | Singh, R.P [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: 2010Description: 1 page.Summary: Leaf rust, caused by the fungal pathogen Puccinia triticina is the most prevalent disease of wheat worldwide. Of the many resistance genes discovered, the ones exhibiting adult-plant-resistance (also known as a slow-rusting response) appear to be the ones with the greatest potential to deliver durable leaf rust resistance. The CIMMYT wheat line Weebill 1 exhibits strong quantitative resistance that is a characteristic of the presence of one or more adult-plant-resistance genes. Previous work has determined that this source of resistance is not attributable to Lr34, and although a source of APR gene Lr46 is present in its pedigree, the resistance being displayed is likely due to one or more additional adult-plant-resistance genes. In order to identify and map these sources of resistance, a population of 92 recombinant-inbred-lines was genotyped with 341 polymorphic simple-sequence-repeat markers and phenotyped at a total of five locations in Minnesota and Mexico. The results of this QTL analysis indicate a likely QTL on chromosome 7B, as well as other possible QTL on chromosomes 2B and 5A. Another QTL region was identified on the long arm of chromosome 1B as well, and this was identified as Lr46, confirming the presence of the APR gene in Weebill 1. These newly identified APR QTL can contribute to high levels of resistance.Collection: CIMMYT Staff Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-6159 (Browse shelf) Available
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Leaf rust, caused by the fungal pathogen Puccinia triticina is the most prevalent disease of wheat worldwide. Of the many resistance genes discovered, the ones exhibiting adult-plant-resistance (also known as a slow-rusting response) appear to be the ones with the greatest potential to deliver durable leaf rust resistance. The CIMMYT wheat line Weebill 1 exhibits strong quantitative resistance that is a characteristic of the presence of one or more adult-plant-resistance genes. Previous work has determined that this source of resistance is not attributable to Lr34, and although a source of APR gene Lr46 is present in its pedigree, the resistance being displayed is likely due to one or more additional adult-plant-resistance genes. In order to identify and map these sources of resistance, a population of 92 recombinant-inbred-lines was genotyped with 341 polymorphic simple-sequence-repeat markers and phenotyped at a total of five locations in Minnesota and Mexico. The results of this QTL analysis indicate a likely QTL on chromosome 7B, as well as other possible QTL on chromosomes 2B and 5A. Another QTL region was identified on the long arm of chromosome 1B as well, and this was identified as Lr46, confirming the presence of the APR gene in Weebill 1. These newly identified APR QTL can contribute to high levels of resistance.

Global Wheat Program

English

Lucia Segura

INT0610

CIMMYT Staff Publications Collection

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