A natural variation of flavone synthase II gene enhances flavone accumulation and confers drought adaptation in chrysanthemum
文献类型： 外文期刊
作者： Luo, Jiayi 1 ; Luo, Chang 2 ; Han, Mingzheng 1 ; Wang, Qinrui 3 ; Song, Zhenzhen 1 ; Zhang, Haixia 1 ; Gao, Qiang 4 ; Lin, Tao 5 ; Huang, Conglin 2 ; Zhao, Yafei 1 ; Ma, Chao 1 ;
作者机构： 1.China Agr Univ, Coll Hort, Frontiers Sci Ctr Mol Design Breeding MOE, Dept Ornamental Hort, Beijing 100193, Peoples R China
2.Beijing Acad Agr & Forestry Sci, Inst Grassland Flowers & Ecol, Beijing 100092, Peoples R China
3.DP Technol, 3 Zhongguancun St, Beijing 100089, Peoples R China
4.Qi Biodesign, 9 South penglaiyuan St, Beijing 102209, Peoples R China
5.China Agr Univ, Coll Hort, State Key Lab Agrobiotechnol, Beijing Key Lab Growth & Dev Regulat Protected Veg, Beijing 100193, Peoples R China
关键词： Chrysanthemum; drought; flavone; FNSII; GWAS
期刊名称：NEW PHYTOLOGIST （ 影响因子：8.1； 五年影响因子：10.3 ）
ISSN： 0028-646X
年卷期： 2025 年 247 卷 3 期
页码：
收录情况： SCI
摘要： Flavones, a key group of flavonoids, play a significant role in plant adaptation to ecological niches and are valuable medicinal resources. However, the genetic basis underlying their contribution to ecological adaptation remains largely unknown. Here, using metabolite-based genome-wide association study, we report that the natural variation of flavone contents in Chrysanthemum indicum, a wild chrysanthemum and medicinal herb, is mainly determined by a recently duplicated flavone synthase II gene CiFNSII-1.2. Enzymatic assays and molecular dynamics simulations reveal that the key amino acid residues 246th and 261th confer the higher enzymatic activity of CiFNSII-1.2 compared with its ancestral form. These residues act as critical modulators, regulating the flexibility of the external entrance and contributing to the enzyme's improved functionality. Transgenic evaluation demonstrate that CiFNSII-1.2 contributes to flavone accumulation and drought adaptation. Our findings provide insights into the biochemical and evolutionary role of flavones in facilitating adaptation to drought-prone habitats in chrysanthemum.
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