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Document Type

Research

Abstract

Diurnal fluctuations in the acidity of tissue fluids in six to ten week old wheat plants were followed by potentiometric pH measurements of sap freshly expressed from plants at various hours of the day. A daily average fluctuation of 1.5 pH was observed in young plants. The range of pH variation was appreciably extended by increased illumination, maximum acidity occurring dur- ing the early hours of daylight and thereafter falling steadily until the minimum was attained several hours after dark. This degree of pH fluctuation is correlated with variations in the osmotic pressure of expressed sap and thus important in modifying the solubility of nutrients.

Publication Date

1929

Journal Title

Proceedings of the Iowa Academy of Science

Volume

36

Issue

1

First Page

242

Last Page

242

Copyright

© Copyright 1929 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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