Theoretical and Applied Genetics

, Volume 126, Issue 1, pp 93–99 | Cite as

Molecular tagging of a novel rust resistance gene R 12 in sunflower (Helianthus annuus L.)

  • L. Gong
  • B. S. Hulke
  • T. J. Gulya
  • S. G. Markell
  • L. L. Qi
Original Paper


Sunflower production in North America has recently suffered economic losses in yield and seed quality from sunflower rust (Puccinia helianthi Schwein.) because of the increasing incidence and lack of resistance to new rust races. RHA 464, a newly released sunflower male fertility restorer line, is resistant to both of the most predominant and most virulent rust races identified in the Northern Great Plains of the USA. The gene conditioning rust resistance in RHA 464 originated from wild Helianthus annuus L., but has not been molecularly marked or determined to be independent from other rust loci. The objectives of this study are to identify molecular markers linked to the rust resistance gene and to investigate the allelism of this gene with the unmapped rust resistance genes present in HA-R6, HA-R8 and RHA 397. Virulence phenotypes of seedlings for the F2 population and F2:3 families suggested that a single dominant gene confers rust resistance in RHA 464, and this gene was designated as R 12 . Bulked segregant analysis identified ten markers polymorphic between resistant and susceptible bulks. In subsequent genetic mapping, the ten markers covered 33.4 cM of genetic distance on linkage group 11 of sunflower. A co-dominant marker CRT275-11 is the closest marker distal to R 12 with a genetic distance of 1.0 cM, while ZVG53, a dominant marker linked in the repulsion phase, is proximal to R 12 with a genetic distance of 9.6 cM. The allelism test demonstrated that R 12 is not allelic to the rust resistance genes in HA-R6, HA-R8 and RHA 397, and it is also not linked to any previously mapped rust resistance genes. Discovery of the R 12 novel rust resistance locus in sunflower and associated markers will potentially support the molecular marker-assisted introgression and pyramiding of R 12 into sunflower breeding lines.


Rust Resistance Downy Mildew Infection Type Rust Resistance Gene Helianthus Annuus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Drs. Gerald Seiler and Steven Xu for critical review of the manuscript and Angelia Hogness for technical assistance. This project was supported by the USDA-AMS Cooperative Agreement 12-25-B-0942.


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Copyright information

© Springer-Verlag (outside the USA) 2012

Authors and Affiliations

  • L. Gong
    • 1
  • B. S. Hulke
    • 2
  • T. J. Gulya
    • 2
  • S. G. Markell
    • 1
  • L. L. Qi
    • 2
  1. 1.Department of Plant PathologyNorth Dakota State UniversityFargoUSA
  2. 2.Northern Crop Science LaboratoryUSDA, Agricultural Research ServiceFargoUSA

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