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园艺学报 ›› 2026, Vol. 53 ›› Issue (6): 1637-1651.doi: 10.16420/j.issn.0513-353x.2025-0745

• 遗传育种·种质资源·分子生物学 • 上一篇    下一篇

文心兰β-胡萝卜素羟化酶基因家族鉴定与表达分析

陈燕1, 郑金璇2, 罗远华1, 陈艺荃1, 方能炎1, 钟淮钦1,*()   

  1. 1 福建省农业科学院作物研究所(福建省种质资源中心)福建省特色花卉工程技术研究中心, 福州 350013
    2 福建农林大学园艺植物生物工程研究所, 福州 350002
  • 收稿日期:2025-12-21 修回日期:2026-03-19 出版日期:2026-06-24 发布日期:2026-06-24
  • 通讯作者:
    * E-mail:
  • 基金资助:
    福建省自然科学基金项目(2024J08092); 国家自然科学基金项目(32502761); 福建省农业科学院自由探索科技创新项目(ZYTS202405); 国家重点研发计划课题(2023YFD1600505); 福建省农业科学院优秀科技创新人才专项(YCZX202502); 福建省人民政府与中国农业科学院高质量发展超越“5511”协同创新工程项目(XTCXGC2021016); 省级财政花卉产业发展项目(闽林文[2023]107号)

Identification and Expression Analysis of the β-Carotene Hydroxylase Gene Family of Oncidium hybridum

CHEN Yan1, ZHENG Jinxuan2, LUO Yuanhua1, CHEN Yiquan1, FANG Nengyan1, ZHONG Huaiqin1,*()   

  1. 1 Institute of Crop SciencesFujian Academy of Agricultural Sciences(Fujian Germplasm Resources Center)/Fujian Engineering Research Center for Characteristic Floriculture, Fuzhou 350013, China
    2 Institute of Horticultural BiotechnologyFujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2025-12-21 Revised:2026-03-19 Published:2026-06-24 Online:2026-06-24
  • Contact:
    * E-mail:

摘要:

β-胡萝卜素羟化酶(β-carotene hydroxylase,BCH)是类胡萝卜素合成代谢通路中的关键限速酶。以文心兰基因组数据为基础,对BCH家族进行鉴定,并对其基因结构、染色体定位、理化性质、系统发育及共线性关系等进行分析,同时分析它们在文心兰‘XM-1’花色变化的不同阶段以及文心兰不同品种中的表达情况。结果表明,在文心兰基因组中共鉴定到9个BCH成员,分布于8条染色体上,且存在片段复制事件。系统进化树表明,OnBCH主要聚类在2个分支。上游启动子上分布多种光信号、胁迫反应、生长发育和激素调节元件。qRT-PCR结果表明,OnBCH1/3/4在文心兰‘XM-1’半开放期(S2,黄色)至盛花期(S4,白色)表达量显著下调,与叶黄素、玉米黄质和β-隐黄质含量变化趋势一致,推测OnBCH1/3/4在文心兰‘XM-1’花色变化中发挥重要作用。12份黄色系列文心兰品种的类胡萝卜素含量具有显著差异,结合qRT-PCR结果推测基因OnBCH1/3/4OnBCH6/7/8/9,在调控类胡萝卜素介导的文心兰呈色功能上具有相似性。通过构建OnBCH的转录因子调控网络,推测MYB-related转录因子evm.model.Chr084.732与BCH3调控模块在文心兰类胡萝卜素介导的花色变化过程中发挥重要作用。

关键词: 文心兰, β-胡萝卜素羟化酶, BCH基因家族, 类胡萝卜素

Abstract:

β-Carotene Hydroxylase(BCH)is a key rate limiting enzyme in the carotenoid biosynthesis pathway. Based on the genome data of Oncidium hybridum,the BCH family was identified. The gene structure,chromosome localization,physicochemical properties,phylogenetic and collinear relationships of the BCH family were analyzed. The BCHs expression patterns were analyzed at different stages of flower color change in O. hybridum‘XM-1’and among different Oncidium cultivars. The results showed that nine BCH members were identified in the genome of O. hybridum,distributed on eight chromosomes,and there were fragment duplication events. The phylogenetic tree indicated that OnBCH mainly cluster in two branches. The upstream promoter region contained various regulatory elements involved in light signals,stress responses,growth and development,and hormone regulatory elements. The qRT-PCR results showed that the expression levels of OnBCH1/3/4 were significantly down-regulated during the half flowering stage(S2,yellow)to the full flowering stage(S4,white)of‘XM-1’. This trend was consistent with the changes in lutein,zeaxanthin,and β-cryptoxanthin content. It was speculated that OnBCH1/3/4 play an important role in the color dynamics of‘XM-1’. There were significant differences in carotenoid content among 12 cultivars of yellow series O. hybridum. Based on qRT-PCR results,it was speculated that genes OnBCH1/3/4,as well as genes OnBCH6/7/8/9,have similarities in regulating carotenoid mediated coloration function in O. hybridum. An OnBCH transcription factor regulatory network was constructed. It was speculated that the MYB-related transcription factor evm.model.Chr084.732 and the BCH3 regulatory module play important roles in the carotenoid-mediated flower color change process of O. hybridum.

Key words: Oncidium hybridum, β-carotene hydroxylase, BCH gene family, carotenoid