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Published in Crop Sci 8:371-373 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Mapping of Stem-Rust Genes Sr9 and Srl6 of Wheat1

E. R. Sears and W. Q. Loegering2

The stem-rust genes Sr9a from Red Egyptian and Srl6 from Thatcher, previously known to be located on chromosome 2B with little or no linkage between them, were mapped by means of telocentric chromosomes. Both genes lie on the long arm, and they showed 10.6% and approximately 50% crossing-over, respectively, with the centromere. Male transmission of telocentric 2BL in competition with the entire 2B from Red Egyptian and Thatcher was 23.6% and 16.0%, respectively, as compared with only 0.4% and 4.1% for telo-2Bs.

Key Words: stem rust resistance • gene mapping • telocentric chromosomes • wheat cytonegetics • Puccinia graminis tritici

1 Cooperative investigations of the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Genetics Department, Missouri AgriculturaI Experiment Station. Journal Series 5297 of the Missouri Station. Approved by the Director.

2 Research Geneticist and former Research Plant Pathologist, respectively, Crops Research Division, ARS, USDA. Address: Genetics Department, University of Missouri, Columbia, Mo. 65201.

Received for publication December 26, 1967.


This article has been cited by other articles:


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T. J. Tsilo, Y. Jin, and J. A. Anderson
Diagnostic Microsatellite Markers for the Detection of Stem Rust Resistance Gene Sr36 in Diverse Genetic Backgrounds of Wheat
Crop Sci., January 16, 2008; 48(1): 253 - 261.
[Abstract] [Full Text] [PDF]

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T. J. Tsilo, Y. Jin, and J. A. Anderson
Microsatellite Markers Linked to Stem Rust Resistance Allele Sr9a in Wheat
Crop Sci., September 1, 2007; 47(5): 2013 - 2020.
[Abstract] [Full Text] [PDF]


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