Under three levels of phosphorus availability, inoculation of pea plants with Penicillium bilaii in growth pouches had no effect on root length (excluding root hairs), mean root diameter, root-hair diameter, P accumulation or shoot growth. However, inoculation with P. bilaii resulted in a 22% increase in the proportion of root containing root hairs and a 33% increase in the mean root-hair length.
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Gulden et al. (2000) studied this question.
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