4.7 Article

Alleviation of Drought Stress in Soybean by Applying a Biostimulant Based on Amino Acids and Macro- and Micronutrients

期刊

AGRONOMY-BASEL
卷 12, 期 10, 页码 -

出版社

MDPI
DOI: 10.3390/agronomy12102244

关键词

Glycine max (L.) Merrill; water stress; biostimulants; photosynthetic metabolism; yield

资金

  1. Fundacao de Estudos e Pesquisas Agricolas e Florestais [FEPAF 1481]
  2. UNESP [PROPG 43/2022]
  3. National Council for Scientific and Technological Development (CNPq, Brazil) [305952/2018-8]

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This study investigated the effects of exogenous application of biostimulants on soybean cultivated under drought stress. The results showed that the application of 0.5 kg ha(-1) of biostimulant can maintain photosynthetic metabolism, increase antioxidant enzyme activity, and enhance productivity.
Drought stress is one of the most predominant environmental factors hindering soybean productivity. Therefore, the study of stress-mitigating strategies, such as the use of biostimulants, is important in order to mitigate this problem. This study investigated the effects of an exogenous application of biostimulants based on amino acids and macro- and micronutrients in the physiological, biochemical and productive responses of soybean cultivated under drought stress. Treatments consisted of T1-dose 0.0 kg ha(-1) (control); T2-dose 0.0 kg ha(-1) (with water-deficit stress); T3-dose 0.25 kg ha(-1); T4-dose 0.5 kg ha(-1); T5-dose 0.75 kg ha(-1); T6-dose 1.0 kg ha(-1) of biostimulant. Application of T4 maintained photosynthetic metabolism, with main action on stomatal conductance, and increased the activity of antioxidant enzymes superoxide dismutase by 420%, catalase by 167% and ascorbate peroxidase by 695%. In addition, it increased the levels of proline by 106%, leaf area by 279% and the dry matter mass of the plants by 26%, which was reflected in a 22% increase in productivity. Therefore, application of the studied biostimulant at a dose of 0.5 kg ha(-1) is recommended to effectively alleviate the adverse effects of drought stress on soybean.

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