Summary
The distribution of zinc in the different solubility groups of proteins and cell wall constituents was studied, using Zn-65 in small maize plants.
Most of the Zn-65 was recovered in the soluble ‘protein’ fraction. The highest values correspond to the solubility groups for basic proteins, albumines and globulines. The prolamines and glutelines also contained an appreciable proportion. Non-dialyzable zinc percentages varied considerably between 0.1 per cent and 19.0 per cent, of the zinc absorbed by a tissue being the lowest figures characteristic for the saline extracts and especially for the grains.
Between the cell wall constituents, most Zn-65 was present in the solubility groups of protopectines and hemicelluloses. After different extractions, a rather tightly bound zinc fraction remains attached to the cell wall. This can only be separated by boiling with KOH, leaving zinc-free cell wall material. The pure α-cellulose walls contained no Zn-65.
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This work was supported by the U. S. Atomic Energy Commission, under Contract AT(30-1)-2043.
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Diez-Altares, C., Bornemisza, E. The localization of zinc-65 in germinating corn tissues. Plant Soil 26, 175–188 (1967). https://doi.org/10.1007/BF01978682
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DOI: https://doi.org/10.1007/BF01978682