AI Article Synopsis

  • Drought stress significantly affects wheat crops worldwide, and using plant growth-promoting bacteria (PGPB) shows promise in helping mitigate these effects and boost plant growth.
  • Researchers evaluated 24 different bacterial strains for their resistance to various abiotic stresses and selected four—ME1, Pa, MR6, and sp D13—for their effectiveness.
  • In experiments, inoculating wheat seeds with these bacteria improved germination rates and overall plant growth under drought conditions, suggesting that these bacteria enhance resilience to water stress by improving key growth parameters and reducing harmful effects like lipid peroxidation.

Article Abstract

Drought stress represents a major constraint with significant impacts on wheat crop globally. The use of plant growth-promoting bacteria (PGPB) has emerged as a promising strategy to alleviate the detrimental impacts of water stress and enhance plant development. We investigated 24 strains from diverse ecosystems, assessed for PGP traits and tolerance ability to abiotic stresses (drought, salinity, temperature, pH, heavy metals, pollutants, herbicides, and fungicides). The most effective bacterial strains ME1, Pa, MR6, and sp D13 were chosen. Furthermore, these strains exhibited PGP activities under osmotic stress (0, 10, 20, and 30% PEG-6000). The impact of these osmotolerant PGPBs on wheat ( L.) growth under drought stress was assessed at two plant growth stages. In an wheat seed germination experiment, bacterial inoculation significantly enhanced germination parameters. In pot experiments, the potential of these bacteria was evaluated in wheat plants under three treatments: Well-watered (100% field capacity), moderate stress (50% FC), and severe stress (25% FC). Results showed a significant decline in wheat growth parameters under increasing water stress for uninoculated seedlings. In contrast, bacterial inoculation mitigated these adverse effects, significantly improving morphological parameters and chlorophyll pigment contents under the stress conditions. While malondialdehyde (lipid peroxidation) and proline contents increased significantly with drought intensity, they decreased after bacterial inoculation. The antioxidant enzyme activities (GPX, CAT, and SOD) in plants decreased after bacterial inoculation. The increased root colonization capacity observed under water stress was attributed to their ability to favorable adaptations in a stressful environment. This study highlighted the potential of selected PGPB to alleviate water stress effects on wheat, promoting practical applications aimed at enhancing crop resilience under conditions of water shortage.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11362268PMC
http://dx.doi.org/10.3934/microbiol.2024025DOI Listing

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