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Microbiological Insights into the Stress-Alleviating Property of an Endophytic Bacillus altitudinis WR10 in Wheat under Low-Phosphorus and High-Salinity Stresses

1
College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou 466001, China
2
Henan Key Laboratory of Plant Molecular Breeding and Bioreactor, Zhoukou 466001, China
3
School of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou 466001, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Microorganisms 2019, 7(11), 508; https://doi.org/10.3390/microorganisms7110508
Received: 16 September 2019 / Revised: 22 October 2019 / Accepted: 29 October 2019 / Published: 29 October 2019
(This article belongs to the Section Environmental Microbiology)
An indole–3–acetic acid producing Bacillus altitudinis WR10 was previously isolated from the root of wheat (Triticum aestivum L.). In this study, the strain WR10 was used for relieving abiotic stresses in wheat under low phosphorus and high saline in hydroponic co-culture models. Significantly, strain WR10 improved wheat seed relative germination rate under salinity stress (200/400 mM NaCl) and the root dry weight in wheat seedlings under phosphorus stress (10 μM KH2PO3) when insoluble phosphates are available. To provide insights into its abiotic stress-alleviating properties, the strain was characterized further. WR10 grows well under different culture conditions. Particularly, WR10 resists salt (12% NaCl) and hydrolyzes both inorganic and organic insoluble phosphates. WR10 uses many plant-derived substrates as sole carbon and energy sources. It produces catalase, amylase, phosphatase, phytase, reductase, and 1–aminocyclopropane–1–carboxylate (ACC) deaminase. In addition, WR10 possesses long peritrichous flagella, and its biofilm formation, as well as phytase production, is induced by abiotic stresses. Overall, the salinity-alleviating property of WR10 in wheat can be attributed to its inherent tolerance to NaCl, formation of biofilm, and production of enzymes, like catalase, amylase, and ACC deaminase. Meanwhile, B. altitudinis WR10 reduces low-phosphorus stress in wheat by production of phosphatases and phytases in the presence of insoluble phosphates. View Full-Text
Keywords: Bacillus altitudinis; wheat; endophyte; abiotic stress; plant growth-promoting bacteria Bacillus altitudinis; wheat; endophyte; abiotic stress; plant growth-promoting bacteria
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Yue, Z.; Shen, Y.; Chen, Y.; Liang, A.; Chu, C.; Chen, C.; Sun, Z. Microbiological Insights into the Stress-Alleviating Property of an Endophytic Bacillus altitudinis WR10 in Wheat under Low-Phosphorus and High-Salinity Stresses. Microorganisms 2019, 7, 508.

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