Abstract
Movement of potassium from somatic hyphae into sporangiophore initials (stages I and II) involved bulk flow induced by evapotranspiration. A progressive decrease in water uptake by the sporangiophore after stage I was associated with a decrease in permeability of the surface, particularly of the upper part of the structure. The rate of uptake of potassium declined more rapidly than water uptake, reaching a minimum during stages II and III, and subsequently increased. Distribution of potassium during the later phases of development was not uniform throughout the sporangiophore. The concentration in the apex was maintained at a constant value of approximately 125 mmol l −1 irrespective of environmental water activity, whereas the concentration in the base was higher, more variable and dependent on environmental water activity. Movement of potassium from base to apex of the sporangiophore was associated with a second type of cytoplasmic streaming which was independent of atmospheric water activity.
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