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<p>Thrips infestation is a&#xa0;major constraint to cotton productivity, yet limited information is available on the associated biochemical defence responses in different cotton genotypes. Understanding these responses is essential for developing resistant genotypes. In the present investigation, thrips-infested oxidative stress dynamics about enzymatic and non-enzymatic antioxidants were analyzed in the leaves of two cotton genotypes, <i>Gossypium hirsutum </i>acc. LH 2107 and <i>G.&#xa0;arboreum</i> cv. LD 491. Leaf samples were collected from uninfested and thrips-infested cotton plants grown under net cages in a&#xa0;controlled environment at 10-day intervals from 15&#xa0;days post-infestation (DPI). In the leaves of both genotypes, thrips-infestation significantly increased the activities of superoxide dismutase, catalase, peroxidase, and lipoxygenase enzymes at different days post-infestation compared to uninfested plant leaves at <i>p</i> ≤ 0.05. However, ascorbate peroxidase activity did not vary significantly except at 45&#xa0;DPI. Lipoxygenase activity was about 3–4-fold higher in both control and infested LD 491 leaves compared to LH 2107 leaves. In LD 491 leaves, thrips feeding increased GSH content, with significant rises at 25&#xa0;DPI (1.13-fold) and 35&#xa0;DPI (1.27-fold) compared to the respective controls. LD 491 leaves also showed a&#xa0;considerable increase in dehydroascorbate content post-thrips infestation at <i>p</i> ≤ 0.05, while LH 2107 leaves showed the reverse trend. These findings indicate genotype-specific antioxidant responses to thrips stress, which may serve as potential biochemical markers for breeding thrips-resistant cotton genotypes.</p>

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Comparative Antioxidative Responses in Gossypium Genotypes Under Thrips palmi Infestation

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Sunidhi,
  • Sucheta Sharma,
  • Prabhjot Singla,
  • Rimaljeet Kaur,
  • Anju Sharma,
  • Suneet Pandher,
  • Satnam Singh

摘要

Thrips infestation is a major constraint to cotton productivity, yet limited information is available on the associated biochemical defence responses in different cotton genotypes. Understanding these responses is essential for developing resistant genotypes. In the present investigation, thrips-infested oxidative stress dynamics about enzymatic and non-enzymatic antioxidants were analyzed in the leaves of two cotton genotypes, Gossypium hirsutum acc. LH 2107 and G. arboreum cv. LD 491. Leaf samples were collected from uninfested and thrips-infested cotton plants grown under net cages in a controlled environment at 10-day intervals from 15 days post-infestation (DPI). In the leaves of both genotypes, thrips-infestation significantly increased the activities of superoxide dismutase, catalase, peroxidase, and lipoxygenase enzymes at different days post-infestation compared to uninfested plant leaves at p ≤ 0.05. However, ascorbate peroxidase activity did not vary significantly except at 45 DPI. Lipoxygenase activity was about 3–4-fold higher in both control and infested LD 491 leaves compared to LH 2107 leaves. In LD 491 leaves, thrips feeding increased GSH content, with significant rises at 25 DPI (1.13-fold) and 35 DPI (1.27-fold) compared to the respective controls. LD 491 leaves also showed a considerable increase in dehydroascorbate content post-thrips infestation at p ≤ 0.05, while LH 2107 leaves showed the reverse trend. These findings indicate genotype-specific antioxidant responses to thrips stress, which may serve as potential biochemical markers for breeding thrips-resistant cotton genotypes.