Abstract
Movements of K+, Na+, and Cl}- ions during transcellular osmosis were studied in internodal cells ofNitella flexilis. Much K+ was released from the endosmotic cell part, but only a little from the exosmotic cell part. The amount of K+ released depended on the osmotic gradient driving transcellular osmosis. Movement of Na+ was hardly detected. Cl}- was released in nearly the same amounts as K+. Release of K+ from the endosmotic cell half was stimulated remarkably by lowering the temperature from 20 to 1 °C, and also by lowering the internal osmotic pressure but inhibited by raising it. The dependence of K+ release on osmotic gradient, internal osmotic pressure and temperature can be explained by their effects on membrane depolarization and membrane resistance (Hayama et al. 1978). We concluded thatP K remained unchanged, whileP Cl increased a great deal in the endosmotic cell part.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.