Abstract
Ammonium sulfate, ammonium carbonate or ammonia gas inhibited water uptake in sugar beet roots whenever the pH was sufficiently high to cause the production of ammonia. When ammonia was removed by aeration, inhibition of the water uptake by roots was rapidly reversed. ATP at 0.2 mm appeared to either wholly or partially prevent the ammonia-induced inhibition of water uptake by roots. ATP may be involved in maintaining the structure of water pathways through the root. In roots lacking epidermis, ammonia did not inhibit water uptake by the roots. This may indicate that the site of the inhibition lies within the root epidermis.
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