Siddiqui IA, Shaukat SS. Liquid culture carbon, nitrogen and inorganic phosphate source regulate nematicidal activity by fluorescent pseudomonads in vitro.
Lett Appl Microbiol 2004;
38:185-90. [PMID:
14962038 DOI:
10.1111/j.1472-765x.2003.01472.x]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS
The aim of the present investigation was to determine the influence of nutrients on the nematicidal activity by Pseudomonas aeruginosa strain IE-6S+ and Ps. fluorescens strain CHA0 in vitro.
METHODS AND RESULTS
Culture filtrate of IE-6S+ and CHA0 obtained from chemically defined medium caused mortality of Meloidogyne javanica juveniles in vitro and that growth medium amended with various C, N or inorganic phosphate (Pi) sources markedly influenced nematicidal activity of the two bacteria. Glycerol (C source), propionate (fatty acid precursor) and L-lysine (N source) enhanced nematicidal activity while glucose (C), L-valine (N) and Pi substantially repressed nematicidal activity of the two bacteria.
CONCLUSION
Liquid culture amendments with various C, N or Pi sources modulate the biosynthesis of nematicidal agents to a different extent in vitro.
SIGNIFICANCE AND IMPACT OF THE STUDY
Developing bacterial strains more responsive to certain environmental signals can be exploited for increased secondary metabolite production in pharmaceutical fermentations and offers new avenues to improve biocontrol.
Collapse