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Ph I-induced transfer of leaf and stripe rust-resistance genes from Aegilops triuncialis and Ae. geniculata to bread wheat

By: Aghaee-Sarbarzeh, M.
Contributor(s): Dhaliwal, H.S [coaut.] | Ferrahi, M [coaut.] | Friebe, B [coaut.] | Gill, B.S [coaut.] | Singh, H [coaut.] | Sukhwinder-Singh [coaut.].
Material type: materialTypeLabelArticlePublisher: 2002ISSN: 1573-5060 (Revista en electrónico); 0014-2336.Subject(s): Aegilops geniculata | Aegilops triuncialis | Alien gene transfer | homoeologous recombination | Puccinia recondita | Puccinia striiformis AGROVOC | Triticum aestivum AGROVOC In: Euphytica v. 127, no. 3, p. 377-382Summary: Leaf and stripe rusts are severe foliar diseases of bread wheat. Recently, chromosomes 5Mg from the related species Aegilops geniculata that confers resistance to both leaf and stripe rust and 5Ut from Ae. triuncialis conferring resistance to leaf rust have been transferred to bread wheat in the form of disomic DS5Mg(5D) and DS5Ut(5A) chromosome substitution lines. The objective of this study was to shorten the alien segments in these lines using Ph I-mediated, induced homoeologous recombination. Putativerecombinants were evaluated for their rust resistance, and by genomic in situ hybridization and microsatellite analyses. One agronomically useful wheat-Ae. geniculata recombinant resistant to leaf and stripe rust was identified that had only a small terminal segment of the 5MgL arm transferred to the long arm of an unidentified wheat chromosome. This germplasm can be used directly in breeding programs. Only one leaf rust-resistant wheat-Ae. triuncialis recombinant, which consists of most of the complete 5Ut chromosome with a small terminal segment derived from 5AS, was identified. This germplasm will need further chromosome engineering before it can be used in wheat improvement.Collection: Reprints Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

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Peer-review: Yes - Open Access: Yes | http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0014-2336

Leaf and stripe rusts are severe foliar diseases of bread wheat. Recently, chromosomes 5Mg from the related species Aegilops geniculata that confers resistance to both leaf and stripe rust and 5Ut from Ae. triuncialis conferring resistance to leaf rust have been transferred to bread wheat in the form of disomic DS5Mg(5D) and DS5Ut(5A) chromosome substitution lines. The objective of this study was to shorten the alien segments in these lines using Ph I-mediated, induced homoeologous recombination. Putativerecombinants were evaluated for their rust resistance, and by genomic in situ hybridization and microsatellite analyses. One agronomically useful wheat-Ae. geniculata recombinant resistant to leaf and stripe rust was identified that had only a small terminal segment of the 5MgL arm transferred to the long arm of an unidentified wheat chromosome. This germplasm can be used directly in breeding programs. Only one leaf rust-resistant wheat-Ae. triuncialis recombinant, which consists of most of the complete 5Ut chromosome with a small terminal segment derived from 5AS, was identified. This germplasm will need further chromosome engineering before it can be used in wheat improvement.

Genetic Resources Program

English

No CIMMYT affiliation|Springer

Carelia Juarez

INT3098

Reprints Collection

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