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<p>Controlled postharvest stress can enhance bioactive compounds in fresh produce, but the response depends on genotype, tissue injury and stress intensity. This study evaluated phenolic-linked antioxidant responses and pentose phosphate pathway-linked redox adjustment in three sweet potato cultivars differing in flesh colour: Kanhangad (white-fleshed), Bhu Sona (orange-fleshed) and Bhu Krishna (purple-fleshed). Storage roots were processed as slices or shreds and incubated at 30, 35 or 40&#xa0;°C for 0, 24, 48 and 72&#xa0;h. Total soluble phenolics (TSP), ABTS antioxidant capacity, glucose-6-phosphate dehydrogenase (G6PDH) activity and selected oxidative and metabolic enzymes were quantified. Time-course responses were integrated using area-under-the-curve (AUC) values, and cultivar, cut type and temperature were analysed as fixed factors. TSP and ABTS generally increased during early warm storage, while G6PDH activity increased progressively over 72&#xa0;h. AUC analysis showed strong cultivar and temperature effects on TSP, ABTS and G6PDH, with a consistent cultivar ranking of Bhu Krishna &gt; Bhu Sona &gt; Kanhangad. TSP was highest at 35&#xa0;°C, whereas ABTS antioxidant capacity and G6PDH activity increased up to 40&#xa0;°C. Cut-type effects were trait- and temperature-dependent rather than uniform. Adjusted regression indicated that G6PDH reflected PPP-linked redox adjustment but was not an independent predictor of TSP or ABTS after accounting for cultivar, cut type and temperature. Supporting enzyme responses indicated broader oxidative and metabolic adjustment during warm storage. These findings show that postharvest enhancement of antioxidant value in coloured sweet potato should be optimized according to cultivar and temperature, with careful consideration of cut format and product-quality constraints.</p> Graphical abstract <p></p>

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Warm-storage stress modulates phenolic antioxidants and pentose phosphate pathway-linked redox responses in coloured sweet potato storage roots

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Pradeepika Chintha,
  • Senthil Alias Sankar,
  • Saravanan Raju,
  • Hanume Gowda K

摘要

Controlled postharvest stress can enhance bioactive compounds in fresh produce, but the response depends on genotype, tissue injury and stress intensity. This study evaluated phenolic-linked antioxidant responses and pentose phosphate pathway-linked redox adjustment in three sweet potato cultivars differing in flesh colour: Kanhangad (white-fleshed), Bhu Sona (orange-fleshed) and Bhu Krishna (purple-fleshed). Storage roots were processed as slices or shreds and incubated at 30, 35 or 40 °C for 0, 24, 48 and 72 h. Total soluble phenolics (TSP), ABTS antioxidant capacity, glucose-6-phosphate dehydrogenase (G6PDH) activity and selected oxidative and metabolic enzymes were quantified. Time-course responses were integrated using area-under-the-curve (AUC) values, and cultivar, cut type and temperature were analysed as fixed factors. TSP and ABTS generally increased during early warm storage, while G6PDH activity increased progressively over 72 h. AUC analysis showed strong cultivar and temperature effects on TSP, ABTS and G6PDH, with a consistent cultivar ranking of Bhu Krishna > Bhu Sona > Kanhangad. TSP was highest at 35 °C, whereas ABTS antioxidant capacity and G6PDH activity increased up to 40 °C. Cut-type effects were trait- and temperature-dependent rather than uniform. Adjusted regression indicated that G6PDH reflected PPP-linked redox adjustment but was not an independent predictor of TSP or ABTS after accounting for cultivar, cut type and temperature. Supporting enzyme responses indicated broader oxidative and metabolic adjustment during warm storage. These findings show that postharvest enhancement of antioxidant value in coloured sweet potato should be optimized according to cultivar and temperature, with careful consideration of cut format and product-quality constraints.

Graphical abstract