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<p>Sugar beet (<i>Beta vulgaris</i> L.) is a promising short-duration crop with high sucrose content, making it a viable industrial crop for Bangladesh. However, climate change induced water scarcity poses a significant challenge for its optimum growth and yield. This study was thus conducted to investigated the efficacy of phytohormone based seed priming for mitigating water deficit stress of sugar beet. A laboratory trial was initially conducted with four phytohormones; salicylic acid [0.5, 0.75, and 1.0 mM]; gibberellic acid [150, 300, and 450&#xa0;mg L⁻¹]; methyl jasmonate [10 20, and 30 µM]; and ethephon [125, 250, and 375&#xa0;mg L⁻¹] in comparison with hydroprimed control for dose optimization and germination evaluation. Results revealed that salicylic acid @ 0.75 mM, gibberellic acid @ 300&#xa0;mg L⁻¹, methyl jasmonate @ 20 µM and ethephon @ 250&#xa0;mg L⁻¹ provided the best overall enhancements. Gibberellic acid distinctively enhanced germination percentage (18%) while methyl jasmonate and ethephon improved the seedling biomass by 21% and 19%, respectively compared to the control. A subsequent pot experiment was conducted in a factorial fashion of three soil moisture levels (80% [control], 60%, and 40% soil water containing capacity) and five seed priming treatments (hydropriming [control], salicylic acid @ 0.75 mM, gibberellic acid @ 300&#xa0;mg L⁻¹, methyl jasmonate @ 20 µM, and ethephon @ 250&#xa0;mg L⁻¹). Results demonstrated that ethephon and methyl jasmonate was the overall best performers. Under severe water deficit stress (40% soil water containing capacity), ethephon priming caused about 46% leaf relative water retention, reduced lipid peroxidation by 35%, and enhanced total chlorophyll content by 73% compared to control. Methyl jasmonate priming showed comparable efficacy as of ethephon; moreover, improved antioxidant activity by 27% and proline accumulation by 4.7-folds compared to control. Salicylic acid priming only excelled in polyphenol synthesis (20%). Hence, this study highlighted phytohormone priming, especially with ethephon and methyl jasmonate as effective for mitigating water scarcity stress of sugar beet. The outcome of the study should contribute in strategizing management interventions of tropical sugar beet under water scarce environments.</p>

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Dose Optimization and Comparative Evaluation of Phytohormonal Seed Priming against Water Deficit Stress in Young Tropical Sugar Beet (Beta vulgaris L.)

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Sheikh Faruk Ahmed,
  • Md. Ashfikar Rahman Doel,
  • Foyshal Mehmood,
  • Tasfiqure Amin Apon,
  • Mahmudul Hasan Tahery,
  • Mohammed Mohi-Ud-Din,
  • AKM Rashadul Islam

摘要

Sugar beet (Beta vulgaris L.) is a promising short-duration crop with high sucrose content, making it a viable industrial crop for Bangladesh. However, climate change induced water scarcity poses a significant challenge for its optimum growth and yield. This study was thus conducted to investigated the efficacy of phytohormone based seed priming for mitigating water deficit stress of sugar beet. A laboratory trial was initially conducted with four phytohormones; salicylic acid [0.5, 0.75, and 1.0 mM]; gibberellic acid [150, 300, and 450 mg L⁻¹]; methyl jasmonate [10 20, and 30 µM]; and ethephon [125, 250, and 375 mg L⁻¹] in comparison with hydroprimed control for dose optimization and germination evaluation. Results revealed that salicylic acid @ 0.75 mM, gibberellic acid @ 300 mg L⁻¹, methyl jasmonate @ 20 µM and ethephon @ 250 mg L⁻¹ provided the best overall enhancements. Gibberellic acid distinctively enhanced germination percentage (18%) while methyl jasmonate and ethephon improved the seedling biomass by 21% and 19%, respectively compared to the control. A subsequent pot experiment was conducted in a factorial fashion of three soil moisture levels (80% [control], 60%, and 40% soil water containing capacity) and five seed priming treatments (hydropriming [control], salicylic acid @ 0.75 mM, gibberellic acid @ 300 mg L⁻¹, methyl jasmonate @ 20 µM, and ethephon @ 250 mg L⁻¹). Results demonstrated that ethephon and methyl jasmonate was the overall best performers. Under severe water deficit stress (40% soil water containing capacity), ethephon priming caused about 46% leaf relative water retention, reduced lipid peroxidation by 35%, and enhanced total chlorophyll content by 73% compared to control. Methyl jasmonate priming showed comparable efficacy as of ethephon; moreover, improved antioxidant activity by 27% and proline accumulation by 4.7-folds compared to control. Salicylic acid priming only excelled in polyphenol synthesis (20%). Hence, this study highlighted phytohormone priming, especially with ethephon and methyl jasmonate as effective for mitigating water scarcity stress of sugar beet. The outcome of the study should contribute in strategizing management interventions of tropical sugar beet under water scarce environments.