Search NASA⌕ Search
Home/Archive/NASA NTRS

NASA NTRS · 20040120434

Voltage transients elicited by brief chilling

Pickard, B. G.
View original source ↗Export metadata ↓

Abstract

Chilling auxin-depleted, etiolated stems of Pisum sativum L. to 4 degrees C for 60 s enhanced the production of previously described voltage transients 20-fold. It is postulated that plasmalemmal permeability to Ca2+ is increased at low temperature, permitting influx of the ion from the apoplast to the cytosol and thereby promoting production of transients. Heating to 40 degrees C or 45 degrees C elicits no increase in transients, and heating to 50 degrees C leads to loss of turgor.

Explore related subjects

Calcium/metabolismColdPeas/metabolism/physiologySupport, U.S. Gov't, Non-P.H.SSupport, U.S. Gov't, P.H.SBiological TransportCytosol/metabolismElectrophysiologyPlant Stems/metabolism/physiologyTime Factors

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Pickard, B. G.. 1984-07-01. Voltage transients elicited by brief chilling. https://ntrs.nasa.gov/citations/20040120434

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

NASA NTRS1984

Voltage transients elicited by sudden step-up of auxin

It is hypothesized (i) that the molecular mechanism for the reception of friction and flexure and the mechanism by which auxin enhances ethylene production have in common a release of free calcium into the cytosol, (ii) that elevated cytosolic calcium initiates vesicle exocytosis, and (iii) that the vesicles release a factor or set of factors which depolarizes the plasmalemma and promotes ethylene synthesis. One consequence of such exocytosis should be small, extracellularly observable voltage transients. Transients, ranging in size up to 600 microvolts and possessing risetimes (10-90%) of approximately 200 ms, are known to be elicited in etiolated stems of Pisum sativum L. by friction and are here shown to be elicited by sudden increase of auxin concentration and also by a Ca2+ ionophore.

Calcium/metabolism↗