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Autoradiographs of soil slices mapping the distribution of phytate-derived33P around the primary root of 6-day-old maize seedlings were used to investigate the uptake of phytate by the root. Analysis
of the autoradiographs with a laser densitometer and processing of the data with image analysing software resulted in a resolution
of 40 μm. The effect of33P-crossfire was corrected by analysis of the apparent33P-gradient around a phosphate-impermeable teflon tube that was inserted into the labeled soil as a standard. In spite of the
high resolution achieved, a significant depletion zone could not be detected when the soil was equilibrated with33P-phytate. However, with33P-inorganic phosphate, 2 concentric zones were obvious. Within the inner zone, P was accumulated by about 20%, while in the
outer zone a corresponding depletion of P could be detected. The accumulation zone coincided with the extension of the root
hair cylinder, whereas the depleted area was clearly beyond the range of the root hairs. 相似文献
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