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<p>Large amounts of tannins (proanthocyanidins) accumulate in specialized tannin cells of persimmon (<i>Diospyros kaki</i> Thunb.) fruit, contributing to the sensation of astringency. However, there is no clear consensus on whether tannin cells within the same cultivar group share common morphological characteristics. In this study, mature fruits were used as experimental material, and tannin cells were examined using a filtration–clarification method combined with soft-fruit pressure smearing. The results showed that: (1) tannin cell morphology was highly diverse and clearly distinct from that of parenchyma cells; (2) tannin cells were generally slender in pollination-constant non-astringent (PCNA) cultivars and wider in non-PCNA types. Pollination-variant non-astringent (PVNA) cultivars contained numerous spine-like tannin cells, whereas tumorous tannin cells were predominant in pollination-variant astringent (PVA) and pollination-constant astringent (PCA) cultivars; (3) browning tannin cells were observed in both PCNA and non-PCNA types, but occurred at lower frequency in Chinese PCNA (C-PCNA) and PCA; (4) across different de-astringent types, most tannin cells were of the coagulated type, while a small proportion of coacervate tannin cells occurred in Japanese PCNA (J-PCNA) and PVNA, and contracted tannin cells were detected in J-PCNA, C-PCNA, and PVNA. Overall, tannin cell morphology exhibited consistent characteristics within cultivar types, indicating its potential as a structural marker for the classification of persimmon cultivars.</p>

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Tannin cell morphology as a structural marker for classification of persimmon cultivars

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月20日

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  • Muhammad Ammar Raza,
  • Umbreen Shahzad,
  • Sakina,
  • Muhammad Ahsan,
  • Maratab Ali,
  • Sania Zaib,
  • Muhammad Tariq

摘要

Large amounts of tannins (proanthocyanidins) accumulate in specialized tannin cells of persimmon (Diospyros kaki Thunb.) fruit, contributing to the sensation of astringency. However, there is no clear consensus on whether tannin cells within the same cultivar group share common morphological characteristics. In this study, mature fruits were used as experimental material, and tannin cells were examined using a filtration–clarification method combined with soft-fruit pressure smearing. The results showed that: (1) tannin cell morphology was highly diverse and clearly distinct from that of parenchyma cells; (2) tannin cells were generally slender in pollination-constant non-astringent (PCNA) cultivars and wider in non-PCNA types. Pollination-variant non-astringent (PVNA) cultivars contained numerous spine-like tannin cells, whereas tumorous tannin cells were predominant in pollination-variant astringent (PVA) and pollination-constant astringent (PCA) cultivars; (3) browning tannin cells were observed in both PCNA and non-PCNA types, but occurred at lower frequency in Chinese PCNA (C-PCNA) and PCA; (4) across different de-astringent types, most tannin cells were of the coagulated type, while a small proportion of coacervate tannin cells occurred in Japanese PCNA (J-PCNA) and PVNA, and contracted tannin cells were detected in J-PCNA, C-PCNA, and PVNA. Overall, tannin cell morphology exhibited consistent characteristics within cultivar types, indicating its potential as a structural marker for the classification of persimmon cultivars.