Abstract
The chemotactic response of Actinoplanes missouriensis zoospores to three different types of fungal spores (conidia of Curvularia lunata, chlamydospores of Fusarium solani and sclerotia of Macrophomina phaseolina) and their exudates was examined in vitro and in soil. Zoospores were attracted in vitro to substances exuded by fungal spores and to a number of organic compounds but not to sodium phosphate buffer solution. Numbers of zoospores attracted to spores of C. lunata, F. solani or M. phaseolina and their exudates, mixed in a sterilized soil, were significantly (P = 0·05) greater than to soil only supplemented with buffer. Movement of zoospores in an unsterilized soil to conidia, chlamydospores or sclerotia was significantly greater (P = 0·05) than background populations occurring in soil held at 0, -10 and -50 mbar matric potential. Attraction of zoospores to fungal spores and (or) their exudates was generally in the order of conidia > chlamydospores > sclerotia both in vitro and in soil. The results suggest that compounds exuded by living fungal spores may act as attractant for motile Actinoplanes zoospores.
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