*7.1. Floral Volatile Research on Cymbidium*

Floral VOCs are important compounds derived from flowers. Floral scent is a key trait for many floricultural crops. The molecular mechanisms underlying the regulation of biosynthesis and emission of volatiles from orchids remain largely elusive. For adding commercial value, studies on floral scents in orchids aim not only to understand the molecular and genetic mechanisms of the biosynthesis and emission of floral scents but also to assist in *Cymbidium* breeding programs. Currently, many orchid researchers are focusing on the development of cultivars with desirable floral scents. Recent reports on the propagation of sterile seedlings [98–100], leaf and flower morphogenesis [101–103], and the characterization of volatiles as floral scents [104,105] in *Cymbidium* spp. also reflect this trend. In fact, the biosynthesis of widespread VOCs in plant tissues is involved in multiple biological functions such as defense against pathogens, parasites, and herbivores [106–108]. The development of floral scents is likely to be a vital event in biological evolution, providing olfactory signals that plants can utilize to attract pollinators. We are presented major floral scent *Cymbidiums* (Figure 3).

**Figure 3.** *Cymbidium* flowers described to the floral scent. (**A**) *C. goeringii*, (**B**) *C. faberi*, (**C**) *C. ensiforium*, (**D**) *C*. "Sael Bit," (**E**) *C*. "Sunny Bell.".
