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Molecular mapping of Aegilops speltoides derived leaf rust resistance gene Lr28 in wheat

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Abstract

In a segregating homozygous F2 population of bread wheat involving a leaf rust resistance gene Lr28 derived from Aegilops speltoides, six randomly amplified polymorphic DNA (RAPD) markers, three each in coupling and repulsion phase were identified as linked to Lr28, mapped to a region spanning 32 cM including the locus. The F2 and F3 populations were studied in the phytotron challenged with the most virulent pathotype 77-5 of leaf rust. A coupling phase linked RAPD marker S464721 and a repulsion phase linked RAPD marker S326550 flanked the gene Lr28 by a distance of 2.4± 0.016 cM on either side. The flanking markers genetically worked as co-dominant markers when analyzed together after separate amplification in the F2 population by distinguishing the homozygotes from the heterozygotes and increased the efficiency of marker assisted selection by reducing the false positives and negatives. One of the three RAPD markers, S421640 was converted to locus specific SCAR marker SCS421640 which was further truncated by designing primers internal from both ends of the original RAPD amplicon to eliminate a non-specific amplification of nearly same size. The truncated polymorphic sequence characterized amplified region marker (TPSCAR) SCS421570 was 70 bp smaller, but resulted in a single band polymorphism specific to Lr28 resistance. The TPSCAR marker was validated for its specificity to the gene Lr28 in nine different genetic backgrounds and on 43 of the 50 Lr genes of both native and alien origin, suggesting the utility of the SCAR markers in pyramiding leaf rust resistance genes in wheat.

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Cherukuri, D.P., Gupta, S.K., Charpe, A. et al. Molecular mapping of Aegilops speltoides derived leaf rust resistance gene Lr28 in wheat. Euphytica 143, 19–26 (2005). https://doi.org/10.1007/s10681-005-1680-6

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