Identification of a STS marker linked to the Aegilops speltoides-derived leaf rust resistance gene Lr28 in wheat |
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| Authors: | S Naik K S Gill V S Prakasa Rao V S Gupta S A Tamhankar S Pujar B S Gill P K Ranjekar |
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| Institution: | (1) Plant Molecular Biology Unit, Biochemical Sciences Division, National Chemical Laboratory, Pune, MS 411 008, India Tel.: +91-212-338234; 342779; Fax: +91-212-338234; 330233 E-mail: pkr@ems.ncl.res.in; vidya@ems.ncl.res.in, IN;(2) Department of Agronomy, University of Nebraska Lincoln, 362B Plant Sciences, P. O. Box 830915, Lincoln, Nebraska 68583-0915, USA, US;(3) Plant Sciences Division, Agharkar Research Institute, Agarkar Road, Pune, MS 411 004, India, IN;(4) Wheat Genetics Resource Center, Department of Plant Pathology Throckmorton Plant Science Center, Kansas State University, Manhattan, KS 66506-5502, USA, US |
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| Abstract: | A sequence-tagged-site (STS) marker is reported linked to Lr28, a leaf rust resistance gene in wheat. RAPD (random amplified polymorphic DNA) analysis of near-isogenic lines (NILs) of
Lr28 in eight varietal backgrounds was carried out using random primers. Genomic DNA enriched for low-copy sequences was used
for RAPD analysis to overcome the lack of reproducibility due to the highly repetitive DNA sequences present in wheat. Of
80 random primers tested on the enriched DNA, one RAPD marker distinguished the NILs and the donor parent from the susceptible
recurrent parents. The additional band present in resistant lines was cloned, sequenced, and STS primers specific for Lr28 were designed. The STS marker (Indian patent pending: 380 Del98) was further confirmed by bulk segregation analysis of F3 families. It was consistently present in the NILs, the resistant F3 bulk and the resistant F3 lines, but was absent in recurrent parents, the susceptible F3 bulk and the susceptible F3 lines.
Received: 20 February 1998 / Accepted: 4 March 1998 |
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| Keywords: | RAPD STS marker Leaf rust resistance gene Lr28 Wheat |
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