Abstract
There was a significant ( P ⩽ 0.05) linear relationship between the ability of eight pseudomonad isolates to increase the emergence of sugarbeet seeds in a soil (in which sugarbeet seeds are subject to damping-off by Pythium ultimum) and their ability to inhibit P. ultimum on seed exudate agar derived from normal (non-surface sterilized) seeds. There was also a significant ( P ⩽ 0.05) linear relationship between the ability of the eight pseudomonad isolates to increase the emergence of sugarbeet seeds in soil and their ability to inhibit P. ultimum on agar medium, containing the same concentration of the most abundant sugars (cellobiose + galactose + sorbose) found in seed exudate agar derived from normal seeds and on agar medium containing cellobiose and galactose alone. These results suggest that a major factor influencing the ability of a pseudomonad isolate to act as a biocontrol agent against P. ultimum on sugarbeet seeds in soil, is their ability to metabolize the constituents of seed exudate in order to produce compounds inhibitory to P. ultimum.
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