Potato onions (Allium cepa var aggregatum G. Don) are multiplying or aggregating onions, very similar to shallots and have been historically cultivated throughout Europe. Currently in Northern Europe they are maintained in home gardens and ex situ field collections. Potato onions are primarily vegetatively propagated, however in Estonia, near Lake Peipsi, this species has been propagated by seed since the seventeenth century. There is increasing interest in Northern Europe in utilizing this germplasm in organic and/or sustainable farming systems. The genetic diversity and relationship between and within European potato onion collections is unclear. From historical records it is known that cultivation, exchange and trade of potato onion has occurred throughout Europe for hundreds of years. This study utilised molecular markers to assess genetic diversity, duplication of genotypes and relationships among and between Nordic, Baltic, Czech and Croatian potato onion collections. Of 264 accessions, 80 catalogued as unique had identical genotypes with one or more other accessions, and are putative duplicates. The genetic diversity within two Estonian sexually propagated accessions was comparable to that found in all of the vegetatively propagated accessions. Accessions from the Nordic countries grouped together genetically, as did Latvian and Lithuanian accessions. Croatian accessions were genetically separated. These genetic relationships suggest historical movement of potato onion germplasm in North-Eastern Europe. The results, in conjunction with other passport and characterization data, can assist in the development of potato onion core collections, facilitating the conservation and utilization of valuable potato onion genetic resources.

土豆洋葱（洋葱VAR aggregatumG. Don）正在繁殖或聚集洋葱，与葱非常相似，并且在整个欧洲都有悠久的历史。目前在北欧，它们被保存在家庭花园和非原生境收集物中。马铃薯洋葱主要通过营养繁殖，但自17世纪以来，该物种已在种子皮繁殖的皮埃普西湖附近。在有机和/或可持续耕作系统中利用这种种质在北欧的兴趣日益增加。欧洲马铃薯洋葱集合之间及其内部的遗传多样性和关系尚不清楚。从历史记录中可以知道，马铃薯洋葱的栽培，交换和贸易已经在整个欧洲进行了数百年。这项研究利用分子标记来评估遗传多样性，北欧，波罗的海，捷克和克罗地亚马铃薯洋葱收藏之间的基因型和关系重复。在264个种质中，有80个被分类为独特的种质，其基因型与一个或多个其他种质相同，并且是推定的重复品。两个爱沙尼亚有性繁殖体的遗传多样性与所有无性繁殖体的遗传多样性相当。北欧国家的种质与拉脱维亚和立陶宛的种质在基因上组合在一起。克罗地亚种质在基因上是分开的。这些遗传关系表明东北部马铃薯洋葱种质的历史运动。将结果与其他护照和特征数据结合在一起，可以帮助开发马铃薯洋葱核心产品，