Abstract
The long-term response of hydroponically grown maize plants to variations in the phosphate concentration in the growth medium was studied. There was a 5-week lag period before any differences between experimental and control groups could be seen. After this period, the plants grown without phosphate devoted a higher percentage of their total mass to roots than did the controls. The roots of the phosphate-free plants were longer and less bushy than those of the control plants. Plants grown without phosphate showed an increase in the amount of acid phosphatase extractable from the external surfaces of the roots by a high salt solution. These phosphate stress responses were induced by 5 μM phosphate but not by 25 μM phosphate.
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Sachay, J.E., Wallace, R.L. & Johns, M.A. Phosphate stress response in hydroponically grown maize. Plant Soil 132, 85–90 (1991). https://doi.org/10.1007/BF00011015
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DOI: https://doi.org/10.1007/BF00011015