Development and characterization of a compensating wheat-Thinopyrum intermedium Robertsonian translocation with Sr44 resistance to stem rust (Ug99)

Wenxuan Liu, Tatiana V. Danilova, Matthew N. Rouse, Robert L. Bowden, Bernd Friebe, Bikram S. Gill, Michael O. Pumphrey

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The emergence of the highly virulent Ug99 race complex of the stem rust fungus (Puccinia graminis Pers. f. sp. tritici Eriks. and Henn.) threatens wheat (Triticumaestivum L.) production worldwide. One of the effective genes against the Ug99 race complex is Sr44, which was derived from Thinopyrum intermedium (Host) Barkworth and D. R. Dewey and mapped to the short arm of 7J (designated 7J#1S) present in the noncompensating T7DS-7J#1L{bullet operator}7J#1S translocation. Noncompensating wheat-alien translocations are known to cause genomic duplications and deficiencies leading to poor agronomic performance, precluding their direct use in wheat improvement. The present study was initiated to produce compensating wheat-Th. intermedium Robertsonian translocations with Sr44 resistance. One compensating RobT was identified consisting of the wheat 7DL arm translocated to the Th. intermedium 7J#1S arm resulting in T7DL{bullet operator}7J#1S. The T7DL{bullet operator}7J#1S stock was designated as TA5657. The 7DL{bullet operator}7J#1S stock carries Sr44 and has resistance to the Ug99 race complex. This compensating RobT with Sr44 resistance may be useful in wheat improvement. In addition, we identified an unnamed stem rust resistance gene located on the 7J#1L arm that confers resistance not only to Ug99, but also to race TRTTF, which is virulent to Sr44. However, the action of the second gene can be modified by the presence of suppressors in the recipient wheat cultivars.

Original languageEnglish (US)
Pages (from-to)1167-1177
Number of pages11
JournalTheoretical and Applied Genetics
Volume126
Issue number5
DOIs
StatePublished - May 2013

Bibliographical note

Funding Information:
This research was part of the project “Durable Rust Resistance in Wheat” conducted by Cornell University and supported by the Bill and Melinda Gates Foundation and by grants from the Kansas Wheat Commission and the Kansas Crop Improvement Association. We thank W. John Raupp for critical editorial review of the manuscript and Shuangye Wu for her technical assistance. This is contribution number 12-451-J from the Kansas Agricultural Experiment Station, Kansas State University, Manhattan, KS 66506-5502, USA. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. USDA is an equal opportunity provider and employer.

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