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Integrative omics reveal mechanisms underlying floral scent biosynthesis in Lagerstroemia suprareticulata

Bo QinGuangxi Key Laboratory of Special Non-wood Forest Cultivation & Utilization, Guangxi Laboratory of Forestry , Guangxi Forestry Research Institute, Nanning 530002 ,Yan XuBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Yang ZhouCollege of Landscape and Tourism, College of Forestry, Hebei Key Laboratory of Floral Biological Breeding, Hebei Agricultural University , Baoding 071000 ,Shuang LinBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Xin HuangGuangxi Key Laboratory of Special Non-wood Forest Cultivation & Utilization, Guangxi Laboratory of Forestry , Guangxi Forestry Research Institute, Nanning 530002 ,Hao DouBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Xi YuanChina National Botanical Garden (North Garden), Key Laboratory of National Forestry and Grassland Administration on Plant Ex situ Conservation, Beijing Floriculture Engineering Technology Research Centre , Beijing 100093 ,Rihong JiangGuangxi Key Laboratory of Special Non-wood Forest Cultivation & Utilization, Guangxi Laboratory of Forestry , Guangxi Forestry Research Institute, Nanning 530002 ,Peng ZhangBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Lijun ZhouBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Yaoheng HuangGuangxi Key Laboratory of Special Non-wood Forest Cultivation & Utilization, Guangxi Laboratory of Forestry , Guangxi Forestry Research Institute, Nanning 530002 ,Tangchun ZhengBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Ming CaiBeijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University , Beijing 100083 ,Gangmin ZhangLaboratory of Systematic Evolution and Biogeography of Woody Plants, School of Ecology and Nature Conservation, Beijing Forestry University , Beijing 100083 ,
2026en
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Abstract Floral scent is a key ornamental trait in plants, and elucidating its molecular biosynthesis mechanism is important for plant breeding. Lagerstroemia suprareticulata is a unique fragrant floral germplasm resource within the genus Lagerstroemia, endemic to China. However, the molecular mechanisms underlying its distinct floral scent remain unclear. In this study, a high-quality, chromosome-level genome assembly of L. suprareticulata (337.229 Mb) was generated by integrating multiple sequencing platforms. Gas chromatography–mass spectrometry (GC–MS) was used to systematically analyze temporal variations in floral fragrance, identifying 14 key aromatic components. By integrating transcriptome data from different flowering stages with metabolic data, key gene co-expression modules were identified, and the expression of critical genes involved in the terpenoid biosynthesis pathway was characterized. Expansion of the TPS gene family likely contributes to floral scent formation in L. suprareticulata. Functional validation demonstrated that two terpene synthase genes (LsTPS27 and LsTPS67), highly expressed during flowering, could utilize GPP to synthesize linalool and FPP to synthesize trans-nerolidol. This study provides a foundation for systematically dissecting floral scent differentiation and molecular evolutionary mechanisms in the genus Lagerstroemia.

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DOI
10.1093/hr/uhag289

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