Seedling resistance to leaf rust available in the synthetic hexaploid wheat line Syn137 was characterised by means of cytogenetic and linkage mapping. Monosomic analysis located a single dominant gene for leaf rust resistance on chromosome 5D. Molecular mapping not only confirmed this location but also positioned the gene to the distal part of the long arm of chromosome 5D. A test of allelism showed that the gene, tentatively named LrSyn137, is independent but closely linked to Lr1. It appears that Syn137 is occasionally heterogeneous for Lr1 since the analysis of the Lr1-specific marker RGA567-5 in the genetic mapping population indicated the presence of Lr1. Syn137 represents another source of genetic variation that can be useful for the diversification of leaf rust resistance in wheat cultivars.

中文翻译：

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人工合成六倍体小麦的节节菜根苗对叶锈病的抗性遗传分析。

合成六倍体小麦品系Syn137可获得的幼苗对叶锈病的抗性通过细胞遗传和连锁作图来表征。单体分析在5D染色体上找到了一个单一的抗叶锈病显性基因。分子作图不仅证实了该位置，而且还将该基因定位在5D染色体长臂的远端。对等位基因的测试表明，该基因暂定名为LrSyn137，它是独立的但与Lr1紧密相连。似乎Syn137对于Lr1有时是异质的，因为在遗传作图群体中对Lr1特异性标记RGA567-5的分析表明存在Lr1。Syn137代表了另一种遗传变异来源，可用于小麦品种抗叶锈病的多样化。