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Floral Structures and Volatile Metabolites of Hoya mcgregorii Schltr.: Revealing Structural Complexity and Metabolite Distribution
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DOI：10.17576/jsm-2026-5503-02.png)
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Abstract
En 中文
Hoya R.Br. is a well-known ornamental genus valued for its distinctive floral morphology and the emission of a wide range of floral scents. However, the structural basis underlying scents production in Hoya flowers remain insufficiently explored. This study focuses on Hoya mcgregorii Schltr and aims to identify and characterise the types and spatial distribution of secretory structures and their associated metabolites through an integrative anatomical, histochemical and phytochemical approach. Using light microscopy, electron microscopy and histochemical staining, two distinct secretory structures were identified: secretory nectaries (sn) located on the corona lobes and unicellular conical shaped glandular trichomes (cgt) distributed along the adaxial epidermis of corolla. Histochemical stanning showed that the sn actively secreted lipids, proteins, starch grains and polysaccharides, while the cgt produced lipid and proteins. Further analysis of the floral scent composition using gas chromatography-mass spectrometry (GC-MS) identified 33 volatile organic compounds (VOCs), with (3-ocimene constituting the dominant component (26.23%). These findings show the presence of morphologically and functionally distinct floral glands in H. mcgregorii and provide new insights into the structural and chemical adaptations involved in scent emission of genus Hoya.
Keywords:
beta-ocimene
Hoya
nectary
trichome
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