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<p>Drought is a major constraint on global grape production, necessitating effective strategies to enhance plant resilience under water limitation. Methyl jasmonate (MeJA) is known to mediate plant stress responses, but its mechanistic role in grapevine drought tolerance remains insufficiently understood. This study investigated the physiological, biochemical, and molecular effects of foliar-applied MeJA (100 µM, every three days) on ‘Summer Black’ grapevines subjected to 21 days of drought stress. MeJA significantly alleviated drought-induced growth inhibition and reduced oxidative damage by lowering malondialdehyde (MDA), hydrogen peroxide (H<sub>2</sub>O<sub>2)</sub>, and electrolyte leakage (EL). It concurrently enhanced photosynthetic pigments, osmolytes (proline, soluble sugars, and proteins), and antioxidant enzyme activities (APX, CAT, SOD, GPX). MeJA also improved nutrient retention (N, P, K, Mg, Ca, Fe, Cu, Zn) and partially restored the expression of drought-suppressed photosynthesis-related genes (<i>VvRCA</i>, <i>VvRBCS</i>, <i>VvRBCL2</i>, <i>VvGAPDH</i>). Furthermore, it activated drought-responsive transcription factors (<i>VvNIP1.1</i>, <i>VvWRKY3</i>, <i>VvNAC17</i>, <i>VvNAC8</i>) and ABA-related genes (<i>VvSnRK2</i>, <i>VvNCED1</i>, <i>VvABF1</i>, <i>VvPP2C</i>), indicating enhanced stress signaling and metabolic adjustment. Overall, MeJA strengthened drought tolerance through integrated regulatory mechanisms, supporting its potential as a practical treatment to improve grapevine performance under water scarcity.</p>

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Methyl Jasmonate Enhances Physiological and Biochemical Indicators and Alleviates Drought Stress in Grapevines Through the Activation of Genes VvNCED1 and VvABF1

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Sabir Iqbal,
  • Essam Elatafi,
  • Komal Tariq,
  • Wen Liu,
  • Basma Elhendawy,
  • Li Shaonan,
  • Yaning Wang,
  • Wentao Li,
  • Huan Yu,
  • Jinggui Fang

摘要

Drought is a major constraint on global grape production, necessitating effective strategies to enhance plant resilience under water limitation. Methyl jasmonate (MeJA) is known to mediate plant stress responses, but its mechanistic role in grapevine drought tolerance remains insufficiently understood. This study investigated the physiological, biochemical, and molecular effects of foliar-applied MeJA (100 µM, every three days) on ‘Summer Black’ grapevines subjected to 21 days of drought stress. MeJA significantly alleviated drought-induced growth inhibition and reduced oxidative damage by lowering malondialdehyde (MDA), hydrogen peroxide (H2O2), and electrolyte leakage (EL). It concurrently enhanced photosynthetic pigments, osmolytes (proline, soluble sugars, and proteins), and antioxidant enzyme activities (APX, CAT, SOD, GPX). MeJA also improved nutrient retention (N, P, K, Mg, Ca, Fe, Cu, Zn) and partially restored the expression of drought-suppressed photosynthesis-related genes (VvRCA, VvRBCS, VvRBCL2, VvGAPDH). Furthermore, it activated drought-responsive transcription factors (VvNIP1.1, VvWRKY3, VvNAC17, VvNAC8) and ABA-related genes (VvSnRK2, VvNCED1, VvABF1, VvPP2C), indicating enhanced stress signaling and metabolic adjustment. Overall, MeJA strengthened drought tolerance through integrated regulatory mechanisms, supporting its potential as a practical treatment to improve grapevine performance under water scarcity.