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Some interactions between plant roots and pathogenic soil fungi


, : Some interactions between plant roots and pathogenic soil fungi. Australian Jour Biol Sci 9(1): 45-52

A cellophane bag technique is described which enables some chemical interactions between organisms to be studied in situ. Both Pellicularia filamentosa and Sclerotinia homeocarpa affect a wide range of plants. P. filamentosa causes typical damping-off of seedlings whereas S. homeocarpa causes a severe stunting without penetrating the plant tissue. It was shown by the cellophane bag technique that these fungi excrete substances "toxic to the plants, and also that the roots of lettuce and radish seedlings stimulate the growth of P. filamentosa but the roots of tomato seedlings do not. Preliminary investigations on the relation of the root excretions to infection and susceptibility of seedlings are described.

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