7.1.2. Cymbidium faberi

*C. faberi* Rolfe is one of the most significant species with elegant flower scents [44], and is one of the oriental orchids that has been longest cultivated. There are more than 100 compounds in the flower scent of blooming *C. faberi* flowers. Among these, MeJA is the most abundant, but is almost untraceable in the volatile emission of withered flowers [44]. The major pathways include α-linolenic acid metabolism, pyruvate metabolism, and fatty acid degradation, which contribute to the conversion of α-linolenic acid to MeJA. One of the differentially expressed genes (DEGs), *jasmonic acid carboxyl methyltransferase* (*CfJMT*), was highly regulated in the blooming flower of *C. faberi.* Consequently, the full-length coding sequence and genomic sequence of *CfAOS* from *C. faberi*, which is localized to the chloroplasts, has no introns, and is one of the most important enzymes in the MeJA biosynthetic pathways in *C. faberi* [58], was cloned. *CfAOS* has numerous roles including insect attraction and mediation of anti-microbial and stress tolerance. AOS and allene oxide cyclase (AOC) are crucial enzymes in the MeJA biosynthetic pathway in *C. faberi.*
