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A special role of the rhizodermis in nutrient uptake by plant roots



A special role of the rhizodermis in nutrient uptake by plant roots



Biochemie und Physiologie der Pflanzen (BPP) 174(9): 831-837



By using the possibility of selective killing the rhizodermis by osmotic shock, further evidence is produced for the hypothesis of a restricted diffusion into the free space of a higher plant's (Zea mays) root cortex and of a special role of the rhizodermis in uptake processes of plant roots. Osmotic shock causes a strong decrease of phosphate uptake from low-concentrated solutions due to an osmotic rupture of rhizodermal cells. Phosphate uptake from higher concentrated solutions is only slightly influenced. Phosphate uptake from low-concentrated solutions takes place at the shock sensitive tissue surface only whereas higher concentrations permit the diffusion of the solute into the free space and allow the shock-insensitive cortical cells to take part in the uptake process. This view is supported by a 2nd line of evidence coming from the investigation of the time course and temperature dependence of phosphate uptake and from measurements of the transmembrane potential difference.

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