Optimization of Siderophore Production by Bacillus sp. PZ-1 and Its Potential Enhancement of Phytoextration of Pb from Soil

• Published in: Journal of microbiology and biotechnology Vol. 27; no. 8; pp. 1500 - 1512
• Main Authors: Yu, Sumei, Teng, Chunying, Bai, Xin, Liang, Jinsong, Song, Tao, Dong, Liying, Jin, Yu, Qu, Juanjuan
• Format: Journal Article
• Language: Korean
• Published: 한국미생물생명공학회 31.08.2017
• Subjects: Bacillus sp. PZ-1; Pb; phytoextraction; response surface methodology; siderophore; phytoextraction; Pb; response surface methodology; PZ-1; Bacillus sp; siderophore
• ISSN: 1017-7825; 1738-8872

In this study, the siderophore-producing characteristics and conditions of Bacillus sp. PZ-1 were investigated and the enhancement of siderophores on Pb uptake and translocation in Brassica juncea were determined. Results of single factor experiment showed that glucose, pH, and Pb(NO 3 ) 2 could stimulate PZ-1 growth and siderophore production. The maximum siderophore production of 90.52% siderophore units was obtained by response surface methodology optimization at the glucose concentration of 21.84 g/l, pH 6.18, and Pb(NO 3 ) 2 concentration of 245.04 μmol/l. The type of siderophore was hydroxamate and its concentration in the fermentation broth amounted to 32.24 μg/ml. Results of pot experiments indicated that the siderophores enhanced B. juncea to assimilate more Pb from soil with the uptake ratio from 1.04 to 2.74, and to translocate more Pb from underground to overground with the TF values from 1.21 to 1.48. The results revealed that Bacillus sp. PZ-1 could produce abundant siderophores and might be potentially used to augment the phytoextraction of Pb from soil.