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<p>Potato virus Y necrotic strain (PVY<sup>NTN</sup>), a significant biotic stressor, affects tuber yield, carbohydrate composition, photosynthesis, and antioxidant mechanisms. This study investigates the physiological, biochemical, and morphological impacts of PVY<sup>NTN</sup> infection on twelve leading potato cultivars in India. Potatoes were grown under controlled conditions, and parameters such as tuber weight, carbohydrate profile, and antioxidant responses were estimated.&#xa0;PVY<sup>NTN</sup> infection caused significant reductions in tuber fresh weight, ranging from about 11–27%, with susceptible cultivars experiencing more severe impacts. Chlorophyll levels (Chl a, Chl b, and total Chl) declined by up to 0.50 fold, indicating compromised photosynthesis. The virus disrupted starch metabolism, resulting in a 47% reduction in starch content. Amylopectin content increased as a compensatory response to decreased amylose levels, highlighting alterations in carbohydrate metabolism. Enhanced activity of catalase, peroxidase, and superoxide dismutase enzymes was observed, reflecting the plants’ defence against oxidative stress. Proline accumulation and malondialdehyde levels indicated significant lipid peroxidation and stress adaptation mechanisms. These include efficient resource allocation, higher starch retention, and enhanced antioxidant activity. The current study provides valuable insights into the virus-plant interaction and highlights the need for breeding resistant potato varieties to mitigate the detrimental effects of PVY<sup>NTN</sup> while sustaining yield and quality.</p>

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Antioxidant Defence Mechanism of Potato (Solanum tuberosum) by Regulation of Physiological and Biochemical Response Under Potato Virus Y Necrotic Strain (PVYNTN) Infection

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Ravinder Kumar,
  • Milan Kumar Lal,
  • Rahul Kumar Tiwari,
  • Dinesh Kumar,
  • Vinay Sagar,
  • Rupak Jena,
  • Rakesh Kumar,
  • Gyanendra Singh,
  • Brajesh Singh

摘要

Potato virus Y necrotic strain (PVYNTN), a significant biotic stressor, affects tuber yield, carbohydrate composition, photosynthesis, and antioxidant mechanisms. This study investigates the physiological, biochemical, and morphological impacts of PVYNTN infection on twelve leading potato cultivars in India. Potatoes were grown under controlled conditions, and parameters such as tuber weight, carbohydrate profile, and antioxidant responses were estimated. PVYNTN infection caused significant reductions in tuber fresh weight, ranging from about 11–27%, with susceptible cultivars experiencing more severe impacts. Chlorophyll levels (Chl a, Chl b, and total Chl) declined by up to 0.50 fold, indicating compromised photosynthesis. The virus disrupted starch metabolism, resulting in a 47% reduction in starch content. Amylopectin content increased as a compensatory response to decreased amylose levels, highlighting alterations in carbohydrate metabolism. Enhanced activity of catalase, peroxidase, and superoxide dismutase enzymes was observed, reflecting the plants’ defence against oxidative stress. Proline accumulation and malondialdehyde levels indicated significant lipid peroxidation and stress adaptation mechanisms. These include efficient resource allocation, higher starch retention, and enhanced antioxidant activity. The current study provides valuable insights into the virus-plant interaction and highlights the need for breeding resistant potato varieties to mitigate the detrimental effects of PVYNTN while sustaining yield and quality.