The paper describes a thermocouple psychrometer for measurements of water potential (ψw) and its components—osmotic potential (ψs + m) and turgor pressure (ψp)—in biological objects. The isopiestic method applied in this work does not require preliminary scarification of plant material for eliminating cuticular resistance to diffusion of water vapors. The device is reliable and simple in operation owing to an original design of replaceable plungers carrying the thermocouples. A modified construction of the lid for a thermocouple chamber and the application of a cryoholder excluded the necessity of removing the sample from the chamber after ψw measurements prior to its freezing in liquid nitrogen and subsequent thawing for determination of ψs +m. This feature improves the accuracy of determining ψp, which is calculated as ψw − ψs + m. The device can operate with minimal quantities of plant material and allows determination of all three components (ψw, ψs + m, ψp) for the same sample.
Russian Journal of Plant Physiology – Springer Journals
Published: Sep 2, 2010
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
All the latest content is available, no embargo periods.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud