Mature plants of C. faberi with light green flowers, originally introduced from Henan province of China, were grown in the greenhouse at Department of Horticulture, Nanjing Agricultural University (Nanjing, China) under natural light and a controlled temperature of 22–28 °C. The vegetative buds were collected from lateral buds, and the flower buds (0.5–1.0 cm in length) were collected from the peduncle (Fig. 1). Organs from three individual plants were pooled as one sample. The fresh samples were frozen immediately in liquid nitrogen and stored at −80 °C.Fig. 1The mature plants and flowers of C. faberi. a Flowering plants of C. faberi; b Inflorescence with flower buds (f); c Vegetative buds (v); d blooming flowerers; e single flower; f different parts of a single flower, s sepal; p petal; l labellum; c column