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Abstract <p>Climate change is expected to exacerbate drought conditions in agricultural regions, thereby impacting global maize (<i>Zea mays</i> L.) production. A promising alternative to enhance plant growth and drought tolerance involves the use of biostimulants, particularly those based on plant growth-promoting rhizobacteria (PGPR), such as Auras®, which contains <i>Bacillus aryabhattai</i> strain CMAA 1363. To elucidate the effects of this biostimulant, this study characterized its impact on maize plants subjected to both well-watered and drought stress conditions. The study was conducted in a controlled agricultural greenhouse, evaluating parameters including relative water content, electrolyte leakage, chlorophyll indices, proline content, antioxidant enzyme activity (superoxide dismutase, catalase, and ascorbate peroxidase activity), transient chlorophyll <i>a</i> fluorescence, and various morpho-agronomic traits. Treatment with Auras® significantly alleviated drought stress by enhancing relative water content and antioxidant enzyme activities, while reducing membrane damage (as indicated by lower electrolyte leakage) and proline accumulation. Furthermore, it protected the photosynthetic apparatus, as evidenced by the preservation of chlorophyll molecules and enhancements in the oxygen-evolving complex (OEC), the reaction center-to-absorption ratios (RC/ABS), performance indices (PI<sub>abs</sub> and PI<sub>cs</sub>), and driving forces for base absorption (DF<sub>abs</sub>). Under well-watered conditions, the PGPR also improved OEC, RC/ABS, PI<sub>abs</sub>, PI<sub>cs</sub>, DF<sub>abs</sub>, and cross-sectional energy fluxes. In both water regimes, significant improvements in morpho-agronomic parameters were observed, which positively correlated with an increase in the dry mass of the root system. Overall, Auras® induces a series of beneficial modifications that enhance drought tolerance and promote plant growth under both well-watered and drought stress conditions.</p>

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Auras®, a Biostimulant Containing Bacillus aryabhattai Strain CMAA 1363, Enhances Drought Tolerance and Growth in Maize Plants

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • J. P. F. Barbosa,
  • A. A. Vasconcelos,
  • J. R. Santos,
  • G. A. Graça,
  • W. M. Massaranduba,
  • E. K. S. Lopes,
  • M. A. G. Carnelossi,
  • R. Silva-Mann,
  • P. R. Gagliardi,
  • L. F. G. Oliveira Júnior

摘要

Abstract

Climate change is expected to exacerbate drought conditions in agricultural regions, thereby impacting global maize (Zea mays L.) production. A promising alternative to enhance plant growth and drought tolerance involves the use of biostimulants, particularly those based on plant growth-promoting rhizobacteria (PGPR), such as Auras®, which contains Bacillus aryabhattai strain CMAA 1363. To elucidate the effects of this biostimulant, this study characterized its impact on maize plants subjected to both well-watered and drought stress conditions. The study was conducted in a controlled agricultural greenhouse, evaluating parameters including relative water content, electrolyte leakage, chlorophyll indices, proline content, antioxidant enzyme activity (superoxide dismutase, catalase, and ascorbate peroxidase activity), transient chlorophyll a fluorescence, and various morpho-agronomic traits. Treatment with Auras® significantly alleviated drought stress by enhancing relative water content and antioxidant enzyme activities, while reducing membrane damage (as indicated by lower electrolyte leakage) and proline accumulation. Furthermore, it protected the photosynthetic apparatus, as evidenced by the preservation of chlorophyll molecules and enhancements in the oxygen-evolving complex (OEC), the reaction center-to-absorption ratios (RC/ABS), performance indices (PIabs and PIcs), and driving forces for base absorption (DFabs). Under well-watered conditions, the PGPR also improved OEC, RC/ABS, PIabs, PIcs, DFabs, and cross-sectional energy fluxes. In both water regimes, significant improvements in morpho-agronomic parameters were observed, which positively correlated with an increase in the dry mass of the root system. Overall, Auras® induces a series of beneficial modifications that enhance drought tolerance and promote plant growth under both well-watered and drought stress conditions.