Browse Articles

Article|23 Dec 2022|OPEN
Genome-wide analysis of cytochrome P450 genes in Citrus clementina and characterization of a CYP gene encoding flavonoid 3′-hydroxylase
Xiaojuan Liu1 , Qin Gong1 , Chenning Zhao1 , Dengliang Wang2 , Xianming Ye3 , Guixia Zheng3 , Yue Wang1 , Jinping Cao1 and Chongde Sun,1 ,
1Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Zhejiang University, Hangzhou, China
2Institute of Fruit Tree Research, Quzhou Academy of Agriculture and Forestry Acience, Quzhou, China
3Research and Development Department, Zhejiang Jianong Fruit &Vegetable Co., Ltd, Quzhou, China
*Corresponding author. E-mail:

Horticulture Research 10,
Article number: uhac283 (2023)
Views: 359

Received: 10 Oct 2022
Accepted: 07 Dec 2022
Published online: 23 Dec 2022


Cytochrome P450s (CYPs) are the largest family of enzymes in plant and play multifarious roles in development and defense but the available information about the CYP superfamily in citrus is very limited. Here we provide a comprehensive genome-wide analysis of the CYP superfamily in Citrus clementina genome, identifying 301 CYP genes grouped into ten clans and 49 families. The characteristics of both gene structures and motif compositions strongly supported the reliability of the phylogenetic relationship. Duplication analysis indicated that tandem duplication was the major driving force of expansion for this superfamily. Promoter analysis revealed numerous cis-acting elements related to various responsiveness. RNA-seq data elucidated their expression patterns in citrus fruit peel both during development and in response to UV-B. Furthermore, we characterize a UV-B-induced CYP gene (Ciclev10019637m, designated CitF3′H) as a flavonoid 3′-hydroxylase for the first time. CitF3′H catalyzed numerous flavonoids and favored naringenin in yeast assays. Virus-induced silencing of CitF3′H in citrus seedlings significantly reduced the levels of 3′-hydroxylated flavonoids and their derivatives. These results together with the endoplasmic reticulum-localization of CitF3′H in plant suggest that this enzyme is responsible for the biosynthesis of 3′-hydroxylated flavonoids in citrus. Taken together, our findings provide extensive information about the CYP superfamily in citrus and contribute to further functional verification.