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Stripe rust and leaf rust resistance QTL mapping, epistatic interactions, and co‑localization with stem rust resistance loci in spring wheat evaluated over three continents

By: Contributor(s): Material type: ArticleArticleLanguage: En Publication details: 2014ISSN:
  • 0040-5752
 In: Theoretical and Applied Genetics v. 127, no. 11, p. 2465-2477Summary: Key message In wheat, advantageous gene-rich or pleiotropic|regions for stripe, leaf, and stem rust and epistatic|interactions between rust resistance loci should be|accounted for in plant breeding strategies.|Abstract Leaf rust (Puccinia triticina Eriks.) and stripe|rust (Puccinia striiformis f. tritici Eriks) contribute to|major production losses in many regions worldwide. The|objectives of this research were to identify and study epistatic|interactions of quantitative trait loci (QTL) for stripe|and leaf rust resistance in a doubled haploid (DH) population|derived from the cross of Canadian wheat cultivars,|AC Cadillac and Carberry. The relationship of leaf and|stripe rust resistance QTL that co-located with stem rust|resistance QTL previously mapped in this population was|also investigated. The Carberry/AC Cadillac population|was genotyped with DArT® and simple sequence repeat|markers. The parents and population were phenotyped for|stripe rust severity and infection response in field rust nurseries|in Kenya (Njoro), Canada (Swift Current), and New Zealand (Lincoln); and for leaf rust severity and infection|response in field nurseries in Canada (Swift Current) and|New Zealand (Lincoln). AC Cadillac was a source of stripe|rust resistance QTL on chromosomes 2A, 2B, 3A, 3B, 5B,|and 7B; and Carberry was a source of resistance on chromosomes|2B, 4B, and 7A. AC Cadillac contributed QTL|for resistance to leaf rust on chromosome 2A and Carberry|contributed QTL on chromosomes 2B and 4B. Stripe rust|resistance QTL co-localized with previously reported stem|rust resistance QTL on 2B, 3B, and 7B, while leaf rust|resistance QTL co-localized with 4B stem rust resistance|QTL. Several epistatic interactions were identified both|for stripe and leaf rust resistance QTL. We have identified|useful combinations of genetic loci with main and epistatic|effects. Multiple disease resistance regions identified on|chromosomes 2A, 2B, 3B, 4B, 5B, and 7B are prime candidates|for further investigation and validation of their broad|resistance.
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Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&Full=Theoretical%20and%20Applied%20Genetics

Key message In wheat, advantageous gene-rich or pleiotropic|regions for stripe, leaf, and stem rust and epistatic|interactions between rust resistance loci should be|accounted for in plant breeding strategies.|Abstract Leaf rust (Puccinia triticina Eriks.) and stripe|rust (Puccinia striiformis f. tritici Eriks) contribute to|major production losses in many regions worldwide. The|objectives of this research were to identify and study epistatic|interactions of quantitative trait loci (QTL) for stripe|and leaf rust resistance in a doubled haploid (DH) population|derived from the cross of Canadian wheat cultivars,|AC Cadillac and Carberry. The relationship of leaf and|stripe rust resistance QTL that co-located with stem rust|resistance QTL previously mapped in this population was|also investigated. The Carberry/AC Cadillac population|was genotyped with DArT® and simple sequence repeat|markers. The parents and population were phenotyped for|stripe rust severity and infection response in field rust nurseries|in Kenya (Njoro), Canada (Swift Current), and New Zealand (Lincoln); and for leaf rust severity and infection|response in field nurseries in Canada (Swift Current) and|New Zealand (Lincoln). AC Cadillac was a source of stripe|rust resistance QTL on chromosomes 2A, 2B, 3A, 3B, 5B,|and 7B; and Carberry was a source of resistance on chromosomes|2B, 4B, and 7A. AC Cadillac contributed QTL|for resistance to leaf rust on chromosome 2A and Carberry|contributed QTL on chromosomes 2B and 4B. Stripe rust|resistance QTL co-localized with previously reported stem|rust resistance QTL on 2B, 3B, and 7B, while leaf rust|resistance QTL co-localized with 4B stem rust resistance|QTL. Several epistatic interactions were identified both|for stripe and leaf rust resistance QTL. We have identified|useful combinations of genetic loci with main and epistatic|effects. Multiple disease resistance regions identified on|chromosomes 2A, 2B, 3B, 4B, 5B, and 7B are prime candidates|for further investigation and validation of their broad|resistance.

Global Wheat Program

English

CIMMYT Informa No. 1913|Springer

Teresa Garcia

INT2843

CIMMYT Staff Publications Collection


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