Fig. 2

Cold pre-treatment and floral development stage of Cymbidium goeringii. a–c 2 representative floral buds of the plants treated with a prolonged cold condition of 0, 20, and 40 days, respectively, and then returned to normal condition. d–f Developing floral organs the plants treated with a prolonged cold condition of 0, 20, and 40 days, respectively, and then returned to normal condition. g blooming flower. Se, sepal; Pe, petal; Li, lip; Co, column, Bar = 1 cm