Table 1. Listing of plum reference cultivars included in this study indicating group assignment by STRUCTURE analysis and their chloroplastic haplotypes.
| Reference cultivar | Country of origin | K = 2 | K = 3 | K = 5 | Haplotype |
|---|---|---|---|---|---|
| 1Albatros | Hungary | G2.2 | G3.3 | G5.4 | 6 |
| 1California | USA | G2.2 | G3.3 | G5.4 | 1 |
| 1Kirke | UK | G2.1 | G3.1 | G5.1 | 1 |
| 1Lincoln | USA | G2.2 | G3.3 | G5.4 | 1 |
| 1Tragedy | USA | G2.2 | G3.2 | G5.2 | 1 |
| 1Tuleu gras | Romania | G2.2 | G3.3 | G5.4 | 6 |
| 2Amarouge | France | G2.2 | G3.2 | G5.3 | 1 |
| 2Campenca | France | G2.2 | G3.2 | G5.3 | 1 |
| 2De Montfort | France | G2.1 | G3.1 | G5.1 | 1 |
| 2Grosse Bleue | France | G2.2 | G3.3 | G5.4 | 1 |
| 2Impérial Epineuse | France | G2.1 | G3.1 | G5.1 | 5 |
| 2Marcarrière | France | G2.2 | G3.3 | G5.4 | 5 |
| 2Mariolet | France | G2.2 | G3.2 | G5.2 | 1 |
| 2Prune de Vars | UK | G2.1 | G3.1 | G5.1 | 1 |
| 2Royale Bleue | France | G2.2 | G3.3 | G5.2 | 7 |
| 2Saint Antonin | France | G2.2 | G3.3 | G5.3 | 1 |
| 3Anna Spath | Hungary | G2.2 | G3.3 | G5.4 | 1 |
| 3Arandana | Spain | G2.2 | G3.3 | G5.4 | 1 |
| 3De la Rosa | Spain | G2.2 | G3.2 | G5.3 | 1 |
| 3D'Ente | France | G2.2 | G3.3 | G5.4 | 1 |
| 3Pozegaka | USA | G2.2 | G3.3 | G5.4 | 1 |
| 3Ruth Gerstetter | Germany | G2.2 | G3.3 | G5.4 | 1 |
| 4Cacanska lepotica | Serbia | G2.2 | G3.3 | G5.4 | 5 |
| 4Cacanska rodna | Serbia | G2.2 | G3.3 | G5.4 | 5 |
| 4Ersinger | Germany | G2.2 | G3.3 | G5.4 | 1 |
| 4Jojo | Germany | G2.2 | G3.3 | G5.4 | 1 |
| 4Valor | Canada | G2.2 | G3.3 | G5.4 | 5 |
| 5Catalonia | Spain | G2.2 | G3.2 | G5.3 | 1 |
| 5Coe's Golden Drop | UK | G2.2 | G3.3 | G5.4 | 1 |
| 5Gran Prize | USA | G2.2 | G3.3 | G5.4 | 1 |
| 5Monsieur Hatif | France | G2.2 | G3.2 | G5.2 | 1 |
| 5Ontario | USA | G2.2 | G3.3 | G5.4 | 1 |
| 5Reine Claude Comte d'Altham | France | G2.1 | G3.1 | G5.1 | 1 |
| 5Reine Claude Diaphane | France | G2.1 | G3.1 | G5.1 | 1 |
| 5Reine Claude Rosée | France | G2.1 | G3.1 | G5.1 | 1 |
| 5Reine Claude Tardive de Chambourcy | France | G2.1 | G3.1 | G5.1 | 1 |
| 5Reine Claude Violette | France | G2.1 | G3.1 | G5.1 | 1 |
| 5Utility | UK | G2.2 | G3.3 | G5.2 | 1 |
| 5Washington | UK | G2.1 | G3.1 | G5.1 | 1 |
| 6President | UK | G2.2 | G3.3 | G5.4 | 1 |
| 6Reine Claude de Bavay | Belgium | G2.1 | G3.1 | G5.1 | 1 |
| 6Reine Claude d'Oullins | France | G2.1 | G3.1 | G5.1 | 1 |
| 6Reine Claude Verte | France | G2.1 | G3.1 | G5.1 | 1 |
| 6Stanley | USA | G2.2 | G3.3 | G5.4 | 5 |
| 7Questsche d'Italie | Italy | G2.1 | G3.1 | G5.1 | 1 |
| 7Victoria | UK | G2.2 | G3.3 | G5.4 | 1 |
Small numbers indicate the germplasm repositories where the reference cultivars were obtained
1 Research Institute for Fruit Growing and Ornamentals, Budapest Hungary
2French National Institute for Agricultural Research (INRA)
3 Universidad Pública de Navarra (UPNA), Pamplona, Spain
4Institute of Pomology, Croatian Centre for Agriculture, Food and Rural Affairs, Zagreb, Croatia
5School of Agriculture, Policy and Development, University of Reading, UK
6Horofruticulture, CITA de Aragón, Zaragoza, Spain
7Pomology Department, CSIC, Zaragoza, Spain