Abstract
The time sequential mechanism of K42 uptake by sunflower plants from an osmotic pressure series of K42 HCO3 solutions was analyzed with the aid of a localizing scintillation count-rate meter. A range of osmotic pressures from 0.3 to 28.2 atm was selected. Three phases of potassium uptake could be distinguished; an initial, exponential, rapid uptake; a period of saturation; a final phase, of renewed rapid uptake. Solutions with osmotic pressures of < 1.5 atm did not cause appreciable leaf scorching but tended to reduce uptake rates. An osmotic pressure of 7.6 atm resulted in a maximum potassium accumulation in the damaged leaves. All kinetic trends were reversed at 28.2 atm, causing rapid death by dessication. Plasmolytic effects of potassium were discussed in view of uptake stimulation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
