Abstract
The exact structure of phloridzin was further confirmed as phloretin 6′-O-glucopyranoside by a single-crystal X-ray diffraction experiment. The distribution changes of phloridzin in flowering, fruitlet, and fruit ripening phases of Malus rockii were quantified by an HPLC with an external standard. The concentrations of phloridzin in leaves, twigs, and bark and xylem of twigs increased at first and then decreased, and reached the highest value in the fruitlet period. The highest concentration of phloridzin was found in leaves, with the percentage contents of 10.92–14.43 %. What is more, the decreased value of the concentration of phloridzin in leaves from fruit ripening period was almost equivalent to the increased value of the concentration of phloretin. This interesting physiological phenomenon should be able to provide the readers, especially plant physiologists, with a new perspective for the development and utilization of phloridzin.
Funding source: Yunnan Key Laboratory of Screening and Research on Anti-pathogenic Plant Resources from Western Yunnan
Award Identifier / Grant number: 202105AG070003
Funding source: Science and Technology Programs of Dali Bai Autonomous prefecture
Award Identifier / Grant number: D2022ZA0118
Funding source: Guizhou Provincial Basic Research Program
Award Identifier / Grant number: QKHJC-ZK-2023YB002
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 82260680
Funding source: Yunnan Fundamental Research Projects
Award Identifier / Grant number: 202301AT070042
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Research ethics: Not applicable.
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Author contributions: H.-R. Bai and J. Li contributed equally to this work. All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Competing interests: The authors declare no conflicts of interest.
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Research funding: This work was financially supported by the National Natural Science Foundation of China (82260680), the Yunnan Key Laboratory of Screening and Research on Anti-pathogenic Plant Resources from Western Yunnan (202105AG070003), the Yunnan Fundamental Research Projects (202301AT070042), the Science and Technology Programs of Dali Bai Autonomous prefecture (D2022ZA0118), and the Guizhou Provincial Basic Research Program (QKHJC-ZK-2023YB002).
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Data availability: Not applicable.
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/znc-2023-0046).
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