Genome-Wide Identification and Expression Analysis of CCO Gene Family in Dendrobium officinale During Flower Development
To investigate the functions of carotenoid cleavage oxygenase(CCO)gene family in Dendrobium officinale Kimura et Migo,bioinformatics methods were employed to identify the CCO family members in D.officinale.Simultaneously,their expression levels in different tissues,different stages of flower development,and after the application of methyl jasmonate(MeJA).The results revealed that a total of 12 CCO family members were excavated,with ten belonging to the carotenoid cleavage dioxygenase(CCD)subfamily and two belonging to the 9-cis-epoxycarotenoid dioxygenase(NCED)subfamily.They were unevenly distributed on 7 chromosomes,and harbored tandem duplications.The promoter regions of these DoCCO genes contained numerous hormone and stress response elements.The expression of DoCCO genes varied across different tissues of D.officinale,with higher expression observed in pollen and roots.They were differentially expressed during flower development and in response to MeJA treatment,suggesting that their potential roles in growth,development and the MeJA response.Specifically,DoCCD1b,may play a crucial role during flower development.
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