Uptake of calcium by excised barley roots
The uptake of calcium by 6-day-old excised barley roots appears to be largely non-metabolic. The calcium uptake at pH 5 was found to be insensitive to low temperature and dinitrophenol. The uptake of Cals was a reflection of isotopic exchange for initially present inert calcium in the root. This equilibration process was not affected by dinitrophenol. There was a large uptake of calcium by this material at pH 11. This uptake was also largely non-metabolic. Only a small fraction of the calcium uptake at high pH could be accounted for by an increase in organic acids or by precipitation as CaCO3. It is postulated that much of the calcium in young barley roots is associated with the cell surface region. Finally, it is proposed that the calcium which is active in influencing the absorption of other ions is localized on this surface.
- Research Organization:
- Univ. of California Coll. of Agriculture, Berkeley
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-007177
- OSTI ID:
- 4104841
- Journal Information:
- Plant Physiology (Bethesda), Journal Name: Plant Physiology (Bethesda) Journal Issue: 1 Vol. 36; ISSN 0032-0889
- Publisher:
- American Society of Plant Biologists
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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