2. Materials and methods
2.1. Plant material
F. vesca ‘UC-01’ and ‘Hawaii-30’, which are diploid species,
were introduced from the US, while the F. nilgerrensis ‘Whiteberry’,
diploid species and F. × ananassa ‘Akihime’, an octoploid species,
were from Japan. All plants were grown in the greenhouse under
controlled conditions of 26 ◦C days/6 ◦C nights from September
2009 to July 2010 atthe protected Horticulture Experiment Station,
National Institute of Horticultural & Herbal Science in Korea.