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<p>In this study, two cultivars of strawberry (<i>Fragaria</i> × <i>ananassa</i> Duch.) were compared for their response to different levels of heat stress (30, 35, and 40&#xa0;°C, categorized as mild, moderate, and severe heat stress, respectively) with controls growing at 25&#xa0;°C. At temperatures of 25&#xa0;°C and mild heat stress, there were no obvious differences in symptoms between the cultivars Camarosa and Kurdistan. At 40&#xa0;°C, Camarosa exhibited more severe damage compared to Kurdistan, indicating that Kurdistan had greater heat stress tolerance. No significant difference in γ-aminobutyric acid (GABA) content was observed in Camarosa until 35&#xa0;°C, where GABA content significantly decreased compared to the control. In contrast, GABA levels in Kurdistan steadily increased as the heat stress intensified from 25 to 40&#xa0;°C. The concentration of total soluble sugars (TSS) and activities of catalase, ascorbate peroxidase, and superoxide dismutase in both cultivars initially increased under heat stress but declined at 40&#xa0;°C in Camarosa. In Kurdistan, elevated temperatures triggered the expression of GABA shunt-related genes, including glutamate decarboxylase (<i>GAD1</i>) and two catabolic enzymes (<i>GABA-T1</i>, <i>GABA-T3</i>, and <i>SSADH</i>), suggesting that under heat stress, GABA and succinate act as temporary storage metabolites to supply the tricarboxylic acid cycle when the stress is mitigated.</p>

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Different Responses of Two Contrasting Strawberry Cultivars to Heat Exposure Associated with Antioxidative Enzyme Protection and γ‐Aminobutyric Acid Metabolic Pathway

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Elaheh Akbari,
  • Mahdiyeh Gholami,
  • Bahram Baninasab,
  • Majid Talebi

摘要

In this study, two cultivars of strawberry (Fragaria × ananassa Duch.) were compared for their response to different levels of heat stress (30, 35, and 40 °C, categorized as mild, moderate, and severe heat stress, respectively) with controls growing at 25 °C. At temperatures of 25 °C and mild heat stress, there were no obvious differences in symptoms between the cultivars Camarosa and Kurdistan. At 40 °C, Camarosa exhibited more severe damage compared to Kurdistan, indicating that Kurdistan had greater heat stress tolerance. No significant difference in γ-aminobutyric acid (GABA) content was observed in Camarosa until 35 °C, where GABA content significantly decreased compared to the control. In contrast, GABA levels in Kurdistan steadily increased as the heat stress intensified from 25 to 40 °C. The concentration of total soluble sugars (TSS) and activities of catalase, ascorbate peroxidase, and superoxide dismutase in both cultivars initially increased under heat stress but declined at 40 °C in Camarosa. In Kurdistan, elevated temperatures triggered the expression of GABA shunt-related genes, including glutamate decarboxylase (GAD1) and two catabolic enzymes (GABA-T1, GABA-T3, and SSADH), suggesting that under heat stress, GABA and succinate act as temporary storage metabolites to supply the tricarboxylic acid cycle when the stress is mitigated.