Abstract
ABSTRACT Microorganisms in the plant's rhizosphere are capable of solubilising insoluble soil phosphates and can promote plant growth. In this study, a total of 30 bacteria were isolated from soils in Changji city, and one highly efficient strain (B5) was identified as a member of Pseudomonadaceae. B5 exhibited phosphorus (P) solubilisation of 519.66 mg/L in a culture medium containing tricalcium phosphate (Ca3 (PO4)2). Results showed that strain B5 had a high P utilisation rate in a medium containing glucose (monosaccharide), ammonium sulphate and tricalcium phosphate. B5 treatment significantly promoted plant growth and increased the dry weight, the chlorophyll content as well as P content of tomato, marigold and cucumber. Moreover, B5 produced plant growth-promoting hormones, including indole-3-acetic acid (IAA) (4.18 g/L) and gibberellin (GA) (19.8 mg/L). In addition, organic acids including oxalic acid, succinic acid, gluconic acid, arabic-hexanoic acid and glutraic acid were produced by B5 under different phosphorus sources. Our results indicated that B5 is a potential candidate for development as a bioinoculant for horticultural application.
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