Abstract
Bacillus amyloliquefaciens SQR9, isolated from the rhizosphere of cucumber, can control Fusarium wilt of cucumber and directly stimulate plant growth. To evaluate its potential agricultural use, the plant growth promotion of B. amyloliquefaciens SQR9 was evaluated, and the relative mechanisms, especially the production of the phytohormone indole-3-acetic acid (IAA), were investigated. The related plant-growth-promoting factors were genetically and chemically analyzed, and a mutant library was constructed for selecting strains with different IAA production. B. amyloliquefaciens SQR9 showed a growth-promoting activity in greenhouse experiments. Plant-growth-promoting factors like extracellular phytase, volatile components including acetoin, 2,3-butanediol, and phytohormone IAA were detected in B. amyloliquefaciens SQR9 cultures grown under laboratory conditions. Three IAA production mutant strains showed variation in plant-growth-promoting effect. IAA production in B. amyloliquefaciens SQR9 was related to its plant-growth-promoting effect, but IAA alone could not account for the overall observed plant-growth-promoting effect. The promoted plant growth by the rhizospheric strain B. amyloliquefaciens SQR9 can be attributed to multiple factors, including production of phytohormones, volatile compounds, and extracellular enzymes. Therefore, the strain B. amyloliquefaciens SQR9 may be used as a plant-growth-promoting agent to increase crop yield.
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