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Abstract <p>Adams’ rhododendron (<i>Rhododendron adamsii</i> Rehder), also known as Sagan Dali, is a well-known tea and medicinal plant of the <i>Ericaceae</i> family, widely distributed in Siberia. It is characterized by considerable variation in phenolic composition, which determines its biological value. In this study, two rarely investigated populations of <i>R. adamsii</i> from the Republic of Buryatia and the Taimyr Peninsula were examined. A total of 58 phenolic metabolites, including 52 flavonoids, were identified using high-performance liquid chromatography with photodiode array and ion trap–time-of-flight mass spectrometry detection (HPLC–PDA–IT–TOF–MS). Derivatives of gossypetin, myricetin, and quercetin were the most diverse in both populations, whereas members of the 5-methoxymyricetin, kaempferol, taxifolin, and aromadendrin groups showed lower diversity. Chromatographic separation of <i>R. adamsii</i> extract resulted in the isolation of two new flavonoids. Based on ultraviolet spectroscopy, nuclear magnetic resonance spectroscopy, and mass spectrometry analyses, these compounds were identified as myricetin 3-<i>O</i>-(6′′-<i>O</i>-<i>p</i>-hydroxybenzoyl)-β-D-galactopyranoside (adamsoside III) and myricetin 3-<i>O</i>-(6′′-<i>O</i>-benzoyl)-β-D-galactopyranoside (adamsoside IV). The results revealed significant differences in flavonoid profiles and levels between the two <i>R. adamsii</i> populations, which can be attributed to differences in altitude. Increased altitude appeared to be a major factor influencing the accumulation of acylated flavonol glycosides, as well as the total flavonoid content. These findings provide new insights into the diversity of <i>R. adamsii</i> flavonoids and contribute to a better understanding of plant metabolic responses to environmental variation.</p>

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Natural Variation in Leaf Flavonoids among Siberian Populations of Rhododendron adamsii (Ericaceae) and the Identification of New Acylated Myricetin Glycosides

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • D. N. Olennikov,
  • N. I. Kashchenko

摘要

Abstract

Adams’ rhododendron (Rhododendron adamsii Rehder), also known as Sagan Dali, is a well-known tea and medicinal plant of the Ericaceae family, widely distributed in Siberia. It is characterized by considerable variation in phenolic composition, which determines its biological value. In this study, two rarely investigated populations of R. adamsii from the Republic of Buryatia and the Taimyr Peninsula were examined. A total of 58 phenolic metabolites, including 52 flavonoids, were identified using high-performance liquid chromatography with photodiode array and ion trap–time-of-flight mass spectrometry detection (HPLC–PDA–IT–TOF–MS). Derivatives of gossypetin, myricetin, and quercetin were the most diverse in both populations, whereas members of the 5-methoxymyricetin, kaempferol, taxifolin, and aromadendrin groups showed lower diversity. Chromatographic separation of R. adamsii extract resulted in the isolation of two new flavonoids. Based on ultraviolet spectroscopy, nuclear magnetic resonance spectroscopy, and mass spectrometry analyses, these compounds were identified as myricetin 3-O-(6′′-O-p-hydroxybenzoyl)-β-D-galactopyranoside (adamsoside III) and myricetin 3-O-(6′′-O-benzoyl)-β-D-galactopyranoside (adamsoside IV). The results revealed significant differences in flavonoid profiles and levels between the two R. adamsii populations, which can be attributed to differences in altitude. Increased altitude appeared to be a major factor influencing the accumulation of acylated flavonol glycosides, as well as the total flavonoid content. These findings provide new insights into the diversity of R. adamsii flavonoids and contribute to a better understanding of plant metabolic responses to environmental variation.