Abstract
Inhibition of germination of Botrytis cinerea spores by bacteria occurred in water drops placed on mature (9-week-old or over) beetroot plants but not on younger plants (6-week-old). Numbers of bacteria were higher in water drops on mature plants and species composition changed in relation to plant age. Of 9 isolates of bacteria tested in vitro a pale yellow Pseudomonas group III/IV species caused the most inhibition of germination of B. cinerea spores. Numbers of Pseudomonas group III/IV isolated both from water droplets on leaves and unwetted leaves increased in relation to plant age. On older leaves indirect evidence indicated that the bacterium may have colonized internal parts. Levels of amino acids in droplets increased as plants aged. Of 16 different amino acids the lowest concentrations were recorded on youngest (6-week-old) plants. On 10-, 13- and 16-week-old plants levels of individual amino acids were not so clearly related to plant age. Certain amino acids inhibited, others stimulated growth of Pseudomonas group III/IV in vitro, but on leaves numbers of bacteria could not be correlated with natural levels of specific amino acids.
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