Abstract
Wetlands are the most biologically diverse ecosystems on Earth. The isolation of Streptomyces strains from wetlands is helpful to study their diversity and functions in such habitats. In this study, six strains of Streptomyces were isolated from the rhizosphere soil of three plant species in the Huaxi Wetland at Guiyang and were identified as Streptomyces galilaeus, S. avidinii, S. albogriseolus, S. albidoflavus, S. spororaveus, and S. cellulosae, respectively. The six strains all solubilized phosphate, fixed nitrogen, and produced ACC deaminase and siderophores, and four strains also secreted indole-3-acetic acid. The six strains had the ability to resist to certain degrees of salinity, drought, and acidic/alkaline pH stress. In addition, the S. avidinii WL3 and S. cellulosae WL9 strains significantly promoted seed germination of mung bean, pepper, and cucumber, especially the WL3 strain. A pot experiment further showed that WL3 significantly promoted the growth of cucumber seedlings. Thus, strains of six species of Streptomyces with multiple plant growth-promoting characteristics were isolated from the wetland. These results lay a foundation for their potential use as microbial agents for seed-coating treatments.
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This study was funded by the National Natural Science Foundation of China (32060028).
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LH is the corresponding author, HZ, XB, and YH are LH graduate students. LH designed the experiments, HZ wrote the manuscript, these three students performed the experiments, especially HZ. All authors read and approved the final manuscript.
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Zhang, H., Bai, X., Han, Y. et al. Stress-Resistance and Growth-Promoting Characteristics and Effects on Vegetable Seed Germination of Streptomyces sp. Strains Isolated from Wetland Plant Rhizospheres. Curr Microbiol 80, 190 (2023). https://doi.org/10.1007/s00284-023-03297-x
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DOI: https://doi.org/10.1007/s00284-023-03297-x