RELATION OF H-ION CONCENTRATION OF TISSUE FLUIDS TO THE DISTRIBUTION OF IRON IN PLANTS

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Abstract
The pH of tissue fluids varies with light intensity: high pH corresponds to high fight intensity, and low pH to low light intensity. Fleshy or succulent plants show greater variation in pH of tissue fluids with change in light intensity than do thin leaved plants, the range of variation occurring in proportion to the degree of suc-culency of the plants. All plants studied show differences in pH between leaf juices and stem juices; fleshy or succulent plants show much smaller differences, however, than do non-succulent plants, the degree of difference being in proportion to the degree of suc-culency. A comparison of the pH of tissue fluids of different species has no significance whatever unless determinations are made from material collected at the same time from plants grown under approximately identical conditions. Soluble (filterable) Fe content of plants varies directly with the pH variation brought about by changes in light intensity from day to night. Plants in which the tissue fluids have high pH values show high total and relatively low soluble Fe content; and those in which the tissue fluids have low pH values show low total Fe and relatively high soluble Fe content. In all plants studied, the Fe content of leaves was higher than the Fe content of stems.

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