Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 8, Pages 3318-3323Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2007.05.052
Keywords
lipopeptides; poly-gamma-glutamic acid (gamma-PGA); biocontrol agent; fertilizer synergist; solid-state fermentation
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A Bacillus subtilis strain B6-1, previously isolated from the rhizosphere of vegetable, selectively produced antibiotics or poly-gammaglutamic acid (gamma-PGA) in two kinds of liquid media and their co-productions were obtained when using soybean and sweet potato residues in solid-state fermentation. The antibiotics were purified and identified as fengycins. After these residue cultures were introduced, cucumber wilts were effectively suppressed. The introduction also significantly increased the dry weights of roots and shoots of cucumber seedlings, and the roots to shoots ratio, especially at lower nutrition, which indicated the fertilizer synergistic effects. So the product of soybean and sweet potato residues, cultivated with B6-1 co-producing lipopeptides and gamma-PGA, can be expected to be used as both biocontrol agents and fertilizer synergists. (c) 2007 Elsevier Ltd. All rights reserved.
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