Lack of a role for fluorescent siderophore production in the biological control of Pythium damping-off of cucumber by a strain of Pseudomonas putida
1991
Paulitz, T.C. | Loper, J.E.
Hyphal growth but not sporangial germination of Pythium ultimum was inhibited by the synthetic iron chelating compound ethylenediamine (di-o-hydroxyphenylacetic acid) (EDDHA) on water agar and by strain N1R of Pseudomonas putida on King's medium B. Eight prototrophic derivatives of N1R (deficient in fluorescent siderophore [pyoverdine] biosynthesis [Pvd(-)]) were obtained by Tn5 mutagenesis. Pvd(-) derivatives did not inhibit hyphal growth of P. ultimum on King's medium B, but protected cucumber seedlings from Pythium damping-off in three different agricultural soils at levels statistically indistinguishable from the parental strain, N1R. Therefore, pyoverdine production by strain N1R was not critical to biocontrol of Pythium damping-off of cucumber under the conditions of this study.
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