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<p>Pre-harvest application of benzothiadiazole (BTH) improves wine grape quality by modulating lipoxygenase (LOX)-derived volatile compounds, a hallmark aroma profile in ‘Chardonnay’ grapes (<i>Vitis vinifera</i> L.). This study elucidates the impact of whole-plant BTH spraying on LOX metabolite accumulation and relative expression in ‘Chardonnay’ grapes and their possible molecular mechanisms. Our findings demonstrate that BTH treatment significantly increases the concentration of reducing sugars, soluble solids, 100-berry weight, pH, total phenols, and flavonoids in grapes, while reducing titratable acid, skin/berry ratio, and fatty acid concentration. Additionally, the BTH treatment increased the concentration of C<sub>6</sub>/C<sub>9</sub>, aromatic, and volatile norisoprenoid compounds, but decreased terpenoid and branched chain compounds. Relative expression analysis revealed that BTH up-regulated key LOX pathway genes and promoted the conversion of C<sub>6</sub> aldehyde to C<sub>6</sub> alcohol. The results presented in this study may provide insights into BTH’s role in the LOX metabolism regulation and its dual benefits in optimizing grape quality through improved sugar-acid balance and elevated phenols and flavonoids in ‘Chardonnay’ grapes.</p>

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Benzothiadiazole application promotes aroma accumulation in ‘Chardonnay’ grapes by controlling lipoxygenase metabolism

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Kai Wang,
  • Jianfeng Wang,
  • Man Zhao,
  • Yuqi Han,
  • Ruwen Guan,
  • Bo Wang,
  • Bo Zhang,
  • Tengzhen Ma,
  • Jixin Li,
  • Lidan Feng,
  • Yumei Jiang

摘要

Pre-harvest application of benzothiadiazole (BTH) improves wine grape quality by modulating lipoxygenase (LOX)-derived volatile compounds, a hallmark aroma profile in ‘Chardonnay’ grapes (Vitis vinifera L.). This study elucidates the impact of whole-plant BTH spraying on LOX metabolite accumulation and relative expression in ‘Chardonnay’ grapes and their possible molecular mechanisms. Our findings demonstrate that BTH treatment significantly increases the concentration of reducing sugars, soluble solids, 100-berry weight, pH, total phenols, and flavonoids in grapes, while reducing titratable acid, skin/berry ratio, and fatty acid concentration. Additionally, the BTH treatment increased the concentration of C6/C9, aromatic, and volatile norisoprenoid compounds, but decreased terpenoid and branched chain compounds. Relative expression analysis revealed that BTH up-regulated key LOX pathway genes and promoted the conversion of C6 aldehyde to C6 alcohol. The results presented in this study may provide insights into BTH’s role in the LOX metabolism regulation and its dual benefits in optimizing grape quality through improved sugar-acid balance and elevated phenols and flavonoids in ‘Chardonnay’ grapes.