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Analysis of the Lr34/Yr18 Rust Resistance Region in Wheat Germplasm

Kolmer, James A., Singh, Ravi P., Garvin, David F., Viccars, Libby, William, Harinder M., Huerta-Espino, Julio, Ogbonnaya, Francis C., Raman, Harsh, Orford, Simon, Bariana, Harbans S., Lagudah, Evans S.
Crop science 2008 v.48 no.5 pp. 1841
Triticum aestivum, wheat, Puccinia recondita, plant pathogenic fungi, rust diseases, disease resistance, genetic resistance, germplasm, plant genetic resources, genetic markers, plant breeding, introns, cultivars, landraces, wild relatives, alleles
The adult plant resistance gene contributes significantly to durable leaf rust (caused by Eriks.) resistance. Simple and robust molecular markers that enable early detection of are a major advancement in wheat (L.) breeding. An insertion/deletion size variant located at the locus on chromosome 7D within an intron sequence of a sulfate transporter-like gene tightly linked to the dual rust resistance gene was used to examine a global collection of wheat cultivars, landraces, and D genome–containing diploid and polyploid species of wheat relatives. Two predominant allelic size variants, and , found among the wheat cultivars showed disparate variation in different wheat growing zones. A strong association was observed between the presence of and the allele and wheat lines known to have that had the allele were rare. All landraces with the exception of those from China were predominantly of the type. Only one size variant, , was detected among the diploid and polyploid D genome–containing species, indicating that arose subsequent to hexaploid bread wheat synthesis. The lineage of the allele associated with in modern wheat cultivars from North and South America, CIMMYT, Australia, and Russia was tracked back to the cultivars Mentana and Ardito developed in Italy by Nazareno Strampelli in the early 1900s. The robustness of the csLV34 marker in postulating the likely occurrence of across a wide range of wheat germplasm and its utility in wheat breeding was confirmed.