Abstract
The effects of infestation of the roots of tomato seedlings with naturally occurring rhizoplane fungi on the uptake of various nutrients has been studied. Fusarium sp. suppressed the uptake of radioactive phosphate, sulphate, bicarbonate, and glucose by the varieties Bonny Best and Geneva 11. Trichoderma viride Pers. suppressed the uptake of inorganic ions but increased the uptake of glucose in the varieties Moscow and Loran Blood. Marked differences were observed in the distribution of radioactivity among soluble compounds of the shoots of infested and noninfested plants after the supply of C14-labelled glucose or bicarbonate.Rhizoplane fungi appear to have a complex influence on the metabolic activities not only of the root but of the whole plant. This indicates the importance of being aware of the biological aspects of root environment in experimental studies with plants.
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