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<p>Lilac (<i>Syringa</i> L.), exhibiting aromatic flowers and diverse floral coloration, is a popular ornamental specie in China. The <i>Syringa oblata</i> Lindl<i>.</i> species includes two different flower color types, purple-flowered and white-flowered. This study systemically examined the floral volatile organic compounds (VOCs) of purple-flowered <i>Syringa oblata</i> (So) and white-flowered <i>Syringa</i> var. <i>alba</i> (Soa). We evaluated the colorimetric parameters of the two <i>Syringa</i> species using a portable colorimeter based on CIELab system. Floral scent was collected using dynamic headspace adsorption techniques under different circadian rhythms and further analyzed through gas chromatography-mass spectrometry (GC–MS). A significant color differences was reported between So and Soa. Compared to Soa, the So showed a higher positive <i>a</i>* (12.08 ± 0.83) value and a lower negative <i>b</i>* (−&#xa0;8.40 ± 1.10) value. They also showed different reflectance patterns, with So showing a typical reflectance valley between 500 and 600&#xa0;nm. Thirty-four scent compounds, including fatty acid derivatives, benzenoids, and Terpenes were totally identified in these two species. Therein, six key volatile compounds, namely decanal, <i>trans</i>-2-dodecenoic acid, benzeneacetic acid, tetracontane, heneicosane, and Dodecanoic acid significantly contribute to the scent differentiation between two lilac species. Seven major scent compounds, showing notable composition and proportion variations were identified across individuals under different circadian rhythms. This study is significant for the selection, cultivation, and promotion of ornamental lilac cultivars.</p>

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Comparison of floral scent compounds and color properties between Syringa oblata and S. oblata var. alba: insights from circadian rhythms

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Zihan Zheng,
  • Qianning Zhao,
  • Junjie Zhang,
  • Jinpeng Zhang,
  • Weichang Gong,
  • Shihong Luo

摘要

Lilac (Syringa L.), exhibiting aromatic flowers and diverse floral coloration, is a popular ornamental specie in China. The Syringa oblata Lindl. species includes two different flower color types, purple-flowered and white-flowered. This study systemically examined the floral volatile organic compounds (VOCs) of purple-flowered Syringa oblata (So) and white-flowered Syringa var. alba (Soa). We evaluated the colorimetric parameters of the two Syringa species using a portable colorimeter based on CIELab system. Floral scent was collected using dynamic headspace adsorption techniques under different circadian rhythms and further analyzed through gas chromatography-mass spectrometry (GC–MS). A significant color differences was reported between So and Soa. Compared to Soa, the So showed a higher positive a* (12.08 ± 0.83) value and a lower negative b* (− 8.40 ± 1.10) value. They also showed different reflectance patterns, with So showing a typical reflectance valley between 500 and 600 nm. Thirty-four scent compounds, including fatty acid derivatives, benzenoids, and Terpenes were totally identified in these two species. Therein, six key volatile compounds, namely decanal, trans-2-dodecenoic acid, benzeneacetic acid, tetracontane, heneicosane, and Dodecanoic acid significantly contribute to the scent differentiation between two lilac species. Seven major scent compounds, showing notable composition and proportion variations were identified across individuals under different circadian rhythms. This study is significant for the selection, cultivation, and promotion of ornamental lilac cultivars.