Journal
FRONTIERS IN MICROBIOLOGY
Volume 12, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2021.761972
Keywords
barren rocky soil; application potential; multi-omics; phosphate-solubilizing bacteria; phosphate-solubilizing mechanism
Categories
Funding
- China Agriculture Research System of MOF [CARS-10-B24]
- National Key R&D Program of China [2018YFF0213505]
- National Natural Science Foundation of China [31770395]
- Science & Technology Program of Sichuan Province [2017HH0077]
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This study screened highly efficient PSB, especially suitable for barren rocky soil, and explored the P-solubilizing mechanism. Through transcriptome and metabolomics analysis, it was found that PSB FP12 upregulated genes involved in gluconic acid synthesis and the tricarboxylic acid cycle in an AP-deficient environment, leading to enhanced P-solubilizing ability.
Phosphate-solubilizing bacteria (PSB) can alleviate available phosphorus (AP)-deficiency without causing environmental pollution like chemical phosphate fertilizers. However, the research and application of PSB on the barren rocky soil is very rare. We screened six PSB from sweetpotato rhizosphere rocky soil. Among them, Ochrobactrum haematophilum FP12 showed the highest P-solubilizing ability of 1,085.00 mg/L at 7 days, which was higher than that of the most reported PSB. The assembled genome of PSB FP12 was 4.92 Mb with P-solubilizing and plant growth-promoting genes. In an AP-deficient environment, according to transcriptome and metabolomics analysis, PSB FP12 upregulated genes involved in gluconic acid synthesis and the tricarboxylic acid cycle, and increased the concentration of gluconic acid and malic acid, which would result in the enhanced P-solubilizing ability. Moreover, a series of experiments in the laboratory and field confirmed the efficient role of the screened PSB on significantly increasing AP in the barren rocky soil and promoting sweetpotato yield. So, in this study, we screened highly efficient PSB, especially suitable for the barren rocky soil, and explored the P-solubilizing mechanism. The research will reduce the demand for chemical phosphate fertilizers and promote the environment-friendly agricultural development.
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