Genome-wide analysis of the carotenoid cleavage dioxygenases gene family in : Expression profile and cold and drought stress responses.

is a famous ornamental and medicinal plant in Oleaceae. family is involved in the synthesis of pigments, volatiles, strigolactones, and abscisic acid (ABA) in plants. In this study, the family in was analyzed at the genome level. A total of 16 members of the family were identified, which included 11 members of the carotenoid cleavage dioxygenases ( subfamily and 5 members of the 9-cis epoxycarotenoid dioxygenases subfamily. The expression analysis of different tissues demonstrated that three genes might be involved in the synthesis of pigments and volatiles in flowers and fruits. Three genes were effectively expressed in flowers, while only was effectively expressed in fruits. Comparison of between and showed that the structure of FsCCD4-1 is was comparable that of OfCCD4-1 protein, indicating that the protein might be performing, especially in catalyzing the synthesis of β-ionone. However, further comparison of the upstream promoter regions showed that the proteins have major differences in the composition of -elements, which might be responsible for differences in β-ionone content. On the other hand, four genes were significantly up-regulated under cold stress while two were up-regulated in drought stress. The data showed that these genes might be involved in the synthesis of ABA. Taken together, our data improves understanding of the family and provides key candidate genes associated with cold and drought stresses in