Scholarlink

<p>High temperature stress during summer significantly inhibits the growth and reduces the yield of passion fruit(<i>Passiflora edulis</i>). Given the varying sensitivity to high temperature among different passion fruit cultivars, this study compared the growth and physiological metabolic responses of a heat-sensitive cultivar, ‘Tainong No.1’ (TN), and a heat-tolerant cultivar, ‘Qinguo No.9’ (QG9), under continuous high temperature stress (&gt; 32&#xa0;°C). Evaluations of flowering and fruiting habits, cell membrane permeability, osmotic regulator contents, antioxidant enzyme activities, and endogenous hormone dynamics demonstrated that QG9 exhibited superior flowering and fruiting performance under high temperature, with significantly higher average numbers of flowers, floral buds, and fruits than TN. Physiological analyses indicated that QG9 suffered less membrane damage, as reflected by a smaller increase in malondialdehyde content. Moreover, QG9 primarily accumulated soluble sugars for osmotic adjustment, while TN mainly accumulated proline. In the antioxidant system, QG9 markedly enhanced superoxide dismutase activity to mitigate oxidative damage. Endogenous hormone profiling revealed that QG9 maintained higher levels of abscisic acid, gibberellin, auxin, and zeatin, which collectively contributed to delayed leaf senescence and improved heat tolerance. Correlation analysis further clarified the interrelationships among key physiological indices. In conclusion, the heat-tolerant cultivar QG9 alleviates high temperature damage through coordinated regulation of osmotic balance, antioxidant defense, and endogenous hormones. This study provides a theoretical foundation for evaluating heat tolerance in passion fruit and offers practical insights for breeding heat-resistant varieties and optimizing cultivation management.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of Continuous High Temperature Stress on Growth and Physiological Metabolism in Thermosensitive and Heat-Tolerant Passion Fruit Cultivars

  • 期刊论文

  • 发表日期：

    2026年3月3日

查看全文
  • Hai-bin Luo,
  • Jie Gui,
  • Cheng-Mei Huang,
  • Yong-cai Huang,
  • Ge Chen,
  • Hui-Qing Cao,
  • Ping Jiang,
  • Liu Yang

摘要

High temperature stress during summer significantly inhibits the growth and reduces the yield of passion fruit(Passiflora edulis). Given the varying sensitivity to high temperature among different passion fruit cultivars, this study compared the growth and physiological metabolic responses of a heat-sensitive cultivar, ‘Tainong No.1’ (TN), and a heat-tolerant cultivar, ‘Qinguo No.9’ (QG9), under continuous high temperature stress (> 32 °C). Evaluations of flowering and fruiting habits, cell membrane permeability, osmotic regulator contents, antioxidant enzyme activities, and endogenous hormone dynamics demonstrated that QG9 exhibited superior flowering and fruiting performance under high temperature, with significantly higher average numbers of flowers, floral buds, and fruits than TN. Physiological analyses indicated that QG9 suffered less membrane damage, as reflected by a smaller increase in malondialdehyde content. Moreover, QG9 primarily accumulated soluble sugars for osmotic adjustment, while TN mainly accumulated proline. In the antioxidant system, QG9 markedly enhanced superoxide dismutase activity to mitigate oxidative damage. Endogenous hormone profiling revealed that QG9 maintained higher levels of abscisic acid, gibberellin, auxin, and zeatin, which collectively contributed to delayed leaf senescence and improved heat tolerance. Correlation analysis further clarified the interrelationships among key physiological indices. In conclusion, the heat-tolerant cultivar QG9 alleviates high temperature damage through coordinated regulation of osmotic balance, antioxidant defense, and endogenous hormones. This study provides a theoretical foundation for evaluating heat tolerance in passion fruit and offers practical insights for breeding heat-resistant varieties and optimizing cultivation management.