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<p>This study investigates the antioxidant composition of onion bulbs across fifteen genotypes (5 red, 6 yellow, and 4 white) at three developmental stages: 30 days after transplanting (DAT, bulb initiation), 60 DAT (bulb development), and 90 DAT (maturation). Antioxidant components, including total phenolics, flavonols, o-dihydroxyphenols, and anthocyanins, were quantified. Mature bulbs (90 DAT) exhibited significantly higher levels of these compounds, with anthocyanin content increasing 6.5-fold in red genotypes and 2-fold in yellow genotypes. Three representative genotypes were analyzed for key antioxidant biosynthetic enzymes (PAL, ANS, and FLS), revealing stage-specific activity correlated with phytochemical accumulation. Strong correlations between antioxidant activity and phytochemical content were observed across developmental stages. These findings enhance our understanding of antioxidant biosynthesis in onions and provide valuable insights for nutraceutical applications and crop improvement programs aimed at enhancing the health benefits and commercial value of onion varieties.</p>

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Exploring antioxidant dynamics in colored onion genotypes across bulb maturation

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Inderpal Kaur,
  • Neena Chawla,
  • Ajmer Singh Dhatt

摘要

This study investigates the antioxidant composition of onion bulbs across fifteen genotypes (5 red, 6 yellow, and 4 white) at three developmental stages: 30 days after transplanting (DAT, bulb initiation), 60 DAT (bulb development), and 90 DAT (maturation). Antioxidant components, including total phenolics, flavonols, o-dihydroxyphenols, and anthocyanins, were quantified. Mature bulbs (90 DAT) exhibited significantly higher levels of these compounds, with anthocyanin content increasing 6.5-fold in red genotypes and 2-fold in yellow genotypes. Three representative genotypes were analyzed for key antioxidant biosynthetic enzymes (PAL, ANS, and FLS), revealing stage-specific activity correlated with phytochemical accumulation. Strong correlations between antioxidant activity and phytochemical content were observed across developmental stages. These findings enhance our understanding of antioxidant biosynthesis in onions and provide valuable insights for nutraceutical applications and crop improvement programs aimed at enhancing the health benefits and commercial value of onion varieties.