Abstract
The effect of a basidiome stimulatory Pseudomonas putida isolate on hyphal growth of the cultivated mushroom, Agaricus bisporus, was examined in vitro. P. putida promoted the rate of radial hyphal extension, suppressed the frequency of branching, caused the branch angle, alignment of hyphae and balance between aerial and submerged hyphae to change, but did not affect hyphal diameter. A nutrient-limited environment failed to promote hyphal growth or suppress branching. The effect of P. putida on dry weight of fungal material was also investigated. The dry weight of A. bisporus mycelium produced per unit time in the presence of P. putida was similar to that produced over a comparable sector on control plates; however, the total dry weight of fungal material produced in Petri dishes containing P. putida was in all instances less than the control. This deficit was largely due to reduced fungal growth in the absence of the bacterium. The significance of these results is discussed.
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