1. Molecular mapping of adult plant stripe rust resistance in wheat and identification of pyramided QTL genotypes.
- Author
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Bariana, H. S., Bansal, U. K., Schmidt, A., Lehmensiek, A., Kaur, J., Miah, H., Howes, N., and McIntyre, C. L.
- Subjects
STRIPE rust ,WHEAT rusts ,PUCCINIA striiformis ,CULTIVARS - Abstract
The Puccinia striiformis f. sp. tritici (Pst) pathotype, 134 E16A+, detected in 2002 in Australia, produced relatively lower and higher adult plant stripe rust responses, respectively, on cultivars Kukri and Janz in comparison to the pre-2002 Pst pathotype 110 E143A+. Molecular mapping of adult plant stripe rust response variation among 180 Kukri/Janz-derived doubled haploid lines over 4 years, two each with Pst pathotypes 110 E143A+ and 134 E16A+, was performed. QYr.sun- 7B and QYr.sun- 7D were consistently contributed by Kukri and Janz, respectively. QYr.sun- 7D corresponded to the genomic location of Yr18 and QYr.sun- 7B remains to be formally named. QYr.sun- 1B, QYr.sun- 5B, and QYr.sun- 6B were detected during more than one season irrespective of the Pst pathotypes used, whereas QYr.sun- 3B was identified only during the 2003 crop season. QYr.sun- 1A contributed by Janz, and QYr.sun- 2A from Kukri, were detected only against Pst pathotypes 110 E143A+ and 134 E16A+, respectively. The DH lines showing better resistance than the either parent carried combinations of 4 to 6 QTL. These lines are currently being used as stripe rust resistance donors in wheat breeding programs. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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