Major haplotype divergence including multiple germin-like protein genes, at the wheat Sr2 adult plant stem rust resistance locus

0441754 - ÚEB 2015 RIV GB eng J - Článek v odborném periodiku
Mago, R. - Tabe, L. - Vautrin, S. - Šimková, Hana - Kubaláková, Marie - Upadhyaya, N. - Berges, H. - Kong, X.Y. - Breen, J. - Doležel, Jaroslav - Appels, R. - Ellis, J.G. - Spielmeyer, W.
Major haplotype divergence including multiple germin-like protein genes, at the wheat Sr2 adult plant stem rust resistance locus.
BMC Plant Biology. Roč. 14, č. 379 (2014). ISSN 1471-2229. E-ISSN 1471-2229
Grant CEP: GA ČR GBP501/12/G090; GA MŠMT(CZ) LO1204
Institucionální podpora: RVO:61389030
Klíčová slova: Adult plant resistance (APR) * Map-based cloning * Sr2
Kód oboru RIV: EB - Genetika a molekulární biologie
Impakt faktor: 3.813, rok: 2014

Sr2 was located to a region of 867 kb on chromosome 3B in Hope, which corresponded to a region of 567 kb in Chinese Spring. The Hope Sr2 region carried 34 putative genes but only 17 were annotated in the comparable region of Chinese Spring. The two haplotypes differed by extensive DNA sequence polymorphisms between flanking markers as well as by a major insertion/deletion event including ten Germin-Like Protein (GLP) genes in Hope that were absent in Chinese Spring. Haplotype analysis of a limited number of wheat genotypes of interest showed that all wheat genotypes carrying Sr2 possessed the GLP cluster; while, of those lacking Sr2, some, including Marquis, possessed the cluster, while some lacked it. Thus, this region represents a common presence-absence polymorphism in wheat, with presence of the cluster not correlated with presence of Sr2. Comparison of Hope and Marquis GLP genes on 3BS found no polymorphisms in the coding regions of the ten genes but several SNPs in the shared promoter of one divergently transcribed GLP gene pair and a single SNP downstream of the transcribed region of a second GLP. Physical mapping and sequence comparison showed major haplotype divergence at the Sr2 locus between Hope and Chinese Spring. Candidate genes within the Sr2 region of Hope are being evaluated for the ability to confer stem rust resistance. Based on the detailed mapping and sequencing of the locus, we predict that Sr2 does not belong to the NB-LRR gene family and is not related to previously cloned, race non-specific rust resistance genes Lr34 and Yr36.
Trvalý link: http://hdl.handle.net/11104/0244706