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Lack of correlation of in vitro antibiosis with antagonism of ice nucleation active bacteria on leaf surfaces by non ice nucleation active bacteria

Lack of correlation of in vitro antibiosis with antagonism of ice nucleation active bacteria on leaf surfaces by non ice nucleation active bacteria

Phytopathology 78(4): 444-450

ISSN/ISBN: 0031-949X

Only 58% of 88 bacterial strains antagonistic to ice nucleation active strains of Pseudomonas syringae and Erwinia herbicola on leaf surfaces produced compounds inhibitory to P. syringae on any of several culture media tested. Eighty-two percent of those antagonistic to P. synringae in vitro produced iron-regulated antibiotics, 6% produced trypsin-sensitive antibiotics, and 39% produced trypsin or iron-insensitive antibiotics that were inhibitory to P. syringae. Thirty-one percent of the bacterial strains antagonistic to P. syringae on rich culture media were not inhibitory when grown on a defined medium similar in composition to leaf leachates. Frost injury to corn plants treated with mutant strains deficient in production of one or more inhibitory compounds and derived from 24 of 25 parental antibiotic-producing strains did not differ significantly from corn treated with parental strains. Leaf surface populations of antibiotic-deficient mutants generally did not differ significantly from their parental strain, whether applied 2 days before or immediately after challenge inoculations of P. syringae. P. syringae populations and the numbers of bacterial ice nuclei were significantly lower on plants treated with antibiotic-deficient mutants or their parental strains either two days before immediately after challenge inoculations with P. syringae. Antibiotic production by epiphytic bacteria on several laboratory media is not correlated with biological control of ice nucleation active bacteria on plants.

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Accession: 005789195

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