The apple blossoms frost damage decreased by biological control agents of INA+ Pseudomonas syringae
1997
Bilavcik, A. | Kokoskova, B. | Zamecnik, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic). Odbor Rostlinolekarstvi)
About 25 % of 71 screened bacterial strains produced antibiotic substances which inhibited the growth of INA+ strain Ps (Pseudomonas syringae) CCM 4073 in vitro. The selected antagonistic strains were non-pathogenic and also ice nucleation non-active (INA-), The three selected INA- antagonistic strains with the highest antibiosis in vitro were tested in experiments on detached flowering shoots of apple cv. Spartan in environmental chamber. Antagonistic strains induced freezing of 50 % of separated flowers from -5.2 to -7.9 deg. C, however strain INA+ Ps CCM 4073 at -3.9 deg. C. The most effective INA- antagonistic strain lowered the supercooling temperature by 4 deg. C and consequently avoided frost injury of separated blossoms.
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