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<p>Drought stress has a negative impact on agricultural productivity. Tobacco, an important cash crop, often experiences reduced yield and quality due to limited water regimes. Seaweed extract (SWE)-based biostimulants are recognized for their capacity to enhance plant growth, boost crop yields, and improve resistance to abiotic stresses. However, the physio-biochemical effects of SWE on tobacco under drought stress have been insufficiently studied. Accordingly, this field study aimed to assess the effects of various levels of foliar-applied SWE-based biostimulant on tobacco. Experimental treatments comprised two levels of drought severity (WW: well-watered, and DS: by skipping irrigation for 20&#xa0;days at the rapid growth stage), with four levels of foliar-applied SWE (control, 1.0, 3.0, 5.0&#xa0;g L<sup>−1</sup>) in tobacco plants. The results indicate that skipping irrigation significantly decreased the plant height (19.80%), leaf area (45.76%), stem girth (26.78%), leaf number (29.21%), root dry weight (29.33%) and shoot dry weight (29.08%) of tobacco as compared to control (well-watered) conditions. However, the optimal rate of SWE significantly improved the growth, biomass, and photosynthetic attributes of tobacco. This study further revealed that drought conditions surged enhanced the production of oxidative stress attributes (H<sub>2</sub>O<sub>2</sub> and O<sup>2−</sup>), but the optimal level of SWE (5&#xa0;g L<sup>−1</sup>) improved the uptake of nutrients and increased soluble sugars (36.98%), and soluble protein (38.10%), and decreased the proline accumulation (28.42%) and MDA malondialdehyde contents (39.39%) as compared to the control. The optimal level of SWE effectively enhanced metabolic activity, as demonstrated by an increase in total sugars as compared with other treatments of SWE. Furthermore, the optimal level SWE also improved the nitrogen (89.28%), and potassium contents (51.83%) in the tobacco leaves by limiting the chloride ions (51.66%) as compared to the rest of the other treatments. Altogether, the foliar application SWE can mitigate drought stress while enhancing the growth, quality, and physiological performance of tobacco plants, and optimize plant physiological and enzymatic activities. The application of SWE in tobacco cultivation could enhance crop resilience and yield, offering a sustainable solution for improved production under drought-induced stressed conditions.</p>

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Foliar-Applied Seaweed Extract as a Biostimulant for Enhancing Drought Tolerance in Tobacco

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Yutian Tian,
  • Facong Qian,
  • Yaqiong Chen,
  • Kui Liu,
  • Xiangwei Li,
  • Jiansong Wang,
  • Quan He,
  • Qamar uz Zaman,
  • Khawar Sultan,
  • Shah Fahad,
  • Gang Deng,
  • Suiyun Chen

摘要

Drought stress has a negative impact on agricultural productivity. Tobacco, an important cash crop, often experiences reduced yield and quality due to limited water regimes. Seaweed extract (SWE)-based biostimulants are recognized for their capacity to enhance plant growth, boost crop yields, and improve resistance to abiotic stresses. However, the physio-biochemical effects of SWE on tobacco under drought stress have been insufficiently studied. Accordingly, this field study aimed to assess the effects of various levels of foliar-applied SWE-based biostimulant on tobacco. Experimental treatments comprised two levels of drought severity (WW: well-watered, and DS: by skipping irrigation for 20 days at the rapid growth stage), with four levels of foliar-applied SWE (control, 1.0, 3.0, 5.0 g L−1) in tobacco plants. The results indicate that skipping irrigation significantly decreased the plant height (19.80%), leaf area (45.76%), stem girth (26.78%), leaf number (29.21%), root dry weight (29.33%) and shoot dry weight (29.08%) of tobacco as compared to control (well-watered) conditions. However, the optimal rate of SWE significantly improved the growth, biomass, and photosynthetic attributes of tobacco. This study further revealed that drought conditions surged enhanced the production of oxidative stress attributes (H2O2 and O2−), but the optimal level of SWE (5 g L−1) improved the uptake of nutrients and increased soluble sugars (36.98%), and soluble protein (38.10%), and decreased the proline accumulation (28.42%) and MDA malondialdehyde contents (39.39%) as compared to the control. The optimal level of SWE effectively enhanced metabolic activity, as demonstrated by an increase in total sugars as compared with other treatments of SWE. Furthermore, the optimal level SWE also improved the nitrogen (89.28%), and potassium contents (51.83%) in the tobacco leaves by limiting the chloride ions (51.66%) as compared to the rest of the other treatments. Altogether, the foliar application SWE can mitigate drought stress while enhancing the growth, quality, and physiological performance of tobacco plants, and optimize plant physiological and enzymatic activities. The application of SWE in tobacco cultivation could enhance crop resilience and yield, offering a sustainable solution for improved production under drought-induced stressed conditions.