Pseudomonas fluorescens
HC1-07, previously isolated from the
phyllosphere of wheat grown in Hebei province, China, suppresses the
soilborne disease of wheat take-all, caused by
Gaeumannomyces
graminis
var.
tritici
. We report here that strain HC1-07 also suppresses
Rhizoctonia root rot of wheat caused by
Rhizoctonia solani
AG-8. Strain
HC1-07 produced a cyclic lipopeptide (CLP) with a molecular weight of
1,126.42 based on analysis by electrospray ionization mass spectrometry.
Extracted CLP inhibited the growth of
G. graminis
var.
tritici
and
R.
solani
in vitro. To determine the role of this CLP in biological control