1. Seed Conservation Department, Royal Botanic Gardens Kew, Wakehurst Place, Ardingly, West Sussex RH17 6TN, UK;
2. Polish Academy of Sciences, Institute of Dendrology, Parkowa 5, 62–035 Kórnik, Poland;
3. UMR Molecular Seed Physiology, INRA/INH/Université d’Angers, 16 Bd Lavoisier, F‐49045 Angers, France;
4. Department of Agriculture and Forestry, University of Aberdeen, 581 King Street, Aberdeen, UK;
5. Department of Botany, University of Athens, Athens 15784, Greece