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Crape myrtle LiGAoxs displaying activities of gibberellin oxidases respond to branching architectureWei, Hui; Chen, Jinxin; Lu, Zixuan; Zhang, Xingyue; Liu, Guoyuan; Lian, Bolin; Chen, Yanhong; Zhong, Fei; Yu, Chunmei; Zhang, Jian
Plant physiology and biochemistry, 07/2024, Volume: 212Journal Article
In the realm of ornamental horticulture, crape myrtle (Lagerstroemia indica) stands out for its aesthetic appeal, attributed largely to its vibrant flowers and distinctive branching architecture. This study embarked on a comprehensive exploration of the gibberellin oxidase (GAox) gene family in crape myrtle, illuminating its pivotal role in regulating GA levels, a key determinant of plant developmental processes. We identified and characterized 36 LiGAox genes, subdivided into GA2ox, GA3ox, GA20ox, and GAox-like subgroups, through genomic analyses. These genes' evolutionary trajectories were delineated, revealing significant gene expansions attributed to segmental duplication events. Functional analyses highlighted the divergent expression patterns of LiGAox genes across different crape myrtle varieties, associating them with variations in flower color and branching architecture. Enzymatic activity assays on selected LiGA2ox enzymes exhibited pronounced GA2 oxidase activity, suggesting a potential regulatory role in GA biosynthesis. Our findings offered a novel insight into the molecular underpinnings of GA-mediated growth and development in L. indica, providing a foundational framework for future genetic enhancements aimed at optimizing ornamental traits. •A total 36 LiGAox genes were identified from the Lagerstroemia indica.•The LiGAoxs participated in formation of flower colours and branching architecture.•The LiGA2ox2 displayed higher GA2 oxidase vitality, implying LiGA2ox2 participates in GA metabolism.
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