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Identification and mapping of genetic factors controlling stem rust resistance in spring wheat and the study of their epistatic interactions across multiple environments

By: Sukhwinder-Singh.
Contributor(s): Campbell, H [coaut.] | Clarke, F [coaut.] | Cuthbert, R.D [coaut.] | DePauw, R.M [coaut.] | Fetch, T [coaut.] | Knox, R.E [coaut.] | Singh, A.K [coaut.] | Singh, D [coaut.] | Bhavani, S [coaut.] | Morgounov, A.I [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: 2013Description: p. 14.Summary: Stem rust is responsible for major production losses in hexaploid wheat around the world. The spread of Pgt race Ug99 and variants is a threat to worldwide wheat production and efforts are ongoing to identify and incorporate resistance. The objectives of this research were to identify quantitative trait loci (QTL) and to study their epistatic interactions for stem rust resistance in a population derived from the Canadian wheat cultivars AC Cadillac and Carberry. A doubled aploid (DH) population was developed and genotyped with DArT® and SSR markers. The parents and DH lines were phenotyped for stem rust severity and response to Ug99 and variant races in 2009, 2010 and 2011 in field rust nurseries near Njoro, Kenya, and to North American races in 2011 and 2012 near Swift Current, SK, Canada. Seedling infection types with race TTKSK were assessed in a bio-containment facility near Morden, MB, in 2009 and 2012. Eight QTL for stem rust resistance and three QTL for pseudo-black chaff were identified, explaining phenotypic variances (PV) ranging from 2.4 to 48.8%. AC Cadillac contributed stem rust resistance QTL on chromosomes 2B, 3B, 5B, 6D, 7B and 7D. Carberry contributed resistance QTL on 4B and 5A. Epistatic interactions were observed between loci on 4B and 5B, 4B and 7B, 6D and 3B, 6D and 5B, and 6D and 7B. Results from this study will assist in planning breeding for stem rust resistance by maximizing QTL main effects and epistatic interactions.Collection: CIMMYT Staff Publications Collection
List(s) this item appears in: Ug99
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-7285 (Browse shelf) Available
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Abstract only

Stem rust is responsible for major production losses in hexaploid wheat around the world. The spread of Pgt race Ug99 and variants is a threat to worldwide wheat production and efforts are ongoing to identify and incorporate resistance. The objectives of this research were to identify quantitative trait loci (QTL) and to study their epistatic interactions for stem rust resistance in a population derived from the Canadian wheat cultivars AC Cadillac and Carberry. A doubled aploid (DH) population was developed and genotyped with DArT® and SSR markers. The parents and DH lines were phenotyped for stem rust severity and response to Ug99 and variant races in 2009, 2010 and 2011 in field rust nurseries near Njoro, Kenya, and to North American races in 2011 and 2012 near Swift Current, SK, Canada. Seedling infection types with race TTKSK were assessed in a bio-containment facility near Morden, MB, in 2009 and 2012. Eight QTL for stem rust resistance and three QTL for pseudo-black chaff were identified, explaining phenotypic variances (PV) ranging from 2.4 to 48.8%. AC Cadillac contributed stem rust resistance QTL on chromosomes 2B, 3B, 5B, 6D, 7B and 7D. Carberry contributed resistance QTL on 4B and 5A. Epistatic interactions were observed between loci on 4B and 5B, 4B and 7B, 6D and 3B, 6D and 5B, and 6D and 7B. Results from this study will assist in planning breeding for stem rust resistance by maximizing QTL main effects and epistatic interactions.

Global Wheat Program

English

Lucia Segura

INT2843

CIMMYT Staff Publications Collection

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