Abstract

Sugars and amino-N compounds exuded from axenically-grown peanut fruits following mechanical injury, were measured by gas-liquid and thin-layer chromatography. Injury of the peanut fruit surface resulted in a 10–20 fold increase in sugar exudation and an increase in the amount of amino N exuded. Analysis of leachates of the weblite (an exploded shale soil substitute) in which axenic fruits developed showed that exudation of sugars had occurred from uninjured fruits in situ. These results support the hypothesis that exudates in the geocarposphere are an important ecological factor affecting microbes in the soil and the colonization of peanut fruits by Aspergillus flarus.

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