Indirect immunofluorescent microscopy and a tonoplast-specific marker enzyme were used to demonstrate the occurrence of pyrophosphatase within the plasmodesmata in the elongation zone of maize root segments. The pulsed field gradient NMR method (PFG NMR) was applied to study restricted self-diffusion of water molecules in the root segments under normal conditions and after the inhibition of respiration with sodium azide (10 mM NaN3, 30 min). The results led to the conclusion that vacuoles in the root segments examined are interconnected into a unified intercellular continuum and that intervacuolar connections are formed by desmotubules within the plasmodesmata. The water permeability of the vacuolar symplast appears to be controlled by an ATP-dependent process. The experimental data can provide a methodological approach to studying water permeability of the vacuolar symplast with the PFG NMR technique.
Russian Journal of Plant Physiology – Springer Journals
Published: May 19, 2005
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