Abstract
Experiments with detached maize roots confirmed the inhibitory effect of DNP on the uptake of orthophosphate ions (Pi) from nutrient solutions containing ≤ 0.5 mM phosphate. In contrast, the covalent compound bis-[dimethylamido]-phosphoric acid amide [(CH3)2N]2P(0)NH2 (BAPA) was taken up by a process not inhibited by DNP. Moreover, BAPA is more rapid exchanged in root tissue than Pi (efflux studies, indirect compartmental analysis). Pot experiments with soils showed a significant negative correlation between the relative atmospheric humidity and uptake of BAPA. Therefore, this compound seems to be taken up by a manner independent on respiration but dependent on transpiration.
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