ArticleJournal of plant research2007
Osmotic water permeability of plasma and vacuolar membranes in protoplasts II: theoretical basis.
Article in Journal of plant research, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 6 citations in OpenAlex.
- The Role of Aquaporins in Plant Growth under Conditions of Oxygen Deficiency.International journal of molecular sciences · 2022Review
- The Water to Solute Permeability Ratio Governs the Osmotic Volume Dynamics in Beetroot Vacuoles.Frontiers in plant science · 2016Article
- Osmotic water permeability of plasma and vacuolar membranes in protoplasts I: high osmotic water permeability in radish (Raphanus sativus) root cells as measured by a new method.Journal of plant research · 2007Article
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Authors and funding
2 authors at 2 institutions in 1 country.
Funding
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Abstract
Water permeability of the plasma membrane (PM) and the vacuolar membrane (VM) is important for intracellular and transcellular water movement in plants, because mature plant cells have large central vacuoles. We have developed a new method for measuring the osmotic water permeability of the PM and VM (P ( f1) and P ( f2), respectively) in individual plant cells. Here, the theoretical basis and procedure of the method are discussed. Protoplasts isolated from higher plant tissues are used to measure P ( f1) and P ( f2). Because of the semi-permeability (selective permeability) of cellular membranes, protoplasts swell or shrink under hypotonic or hypertonic conditions. A theoretical three-compartment model is presented for simulating time-dependent volume changes in the vacuolar and cytoplasmic spaces in a protoplast during osmotic excursions. The model describes the theoretical relationships between P ( f1), P ( f2) and the bulk osmotic water permeability of protoplasts (P ( f(bulk))). The procedure for measuring the osmotic water permeability is: (1) P ( f(bulk)) is calculated from the time when half of the total change in protoplast volume is completed, by assuming that the protoplast has a single barrier to water movement across it (two-compartment model); (2) P ( f2) of vacuoles isolated from protoplasts is obtained in the same manner; and (3) P ( f1) is determined from P ( f(bulk)) and P ( f2) according to the three-compartment model. The theoretical relationship between P ( fl ) (m s(-1)) and L ( Pl ) (hydraulic conductivity, l=1, 2) (m s(-1) Pa(-1)) is also discussed.
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