Winter wheat mitochondria functioning in vitro in the presence of calcium ions and stress uncoupling CSP310 protein

Winter wheat mitochondria functioning in vitro in the presence of calcium ions and stress... The effects of different Ca2+ concentrations on winter wheat (Triticum aestivum L.) functioning and cytochrome c release after organelle incubation with cold-shock protein with a mol. wt of 310 kD or after cold shock were studied. Low (1–5 μM) and high (25–50 μM) Ca2+ concentrations inhibited mitochondrial respiration in control seedlings, whereas 10 μM Ca2+ enhanced respiration in state 4 and reduced indices characterizing coupling (respiratory control (RC) and ADP: O ratio). At concentrations of 6–20 and 50 μM, Ca2+ ions suppressed CSP310 uncoupling effect, which reduced the rate of respiration and an increase in the RC and ADP: O ratio. Low-temperature stress and exogenous CSP310 induced cytochrome c leakage from winter wheat mitochondria both in the absence of Ca2+ and in the presence of its low concentrations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Winter wheat mitochondria functioning in vitro in the presence of calcium ions and stress uncoupling CSP310 protein

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Publisher
Nauka/Interperiodica
Copyright
Copyright © 2006 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443706030083
Publisher site
See Article on Publisher Site

Abstract

The effects of different Ca2+ concentrations on winter wheat (Triticum aestivum L.) functioning and cytochrome c release after organelle incubation with cold-shock protein with a mol. wt of 310 kD or after cold shock were studied. Low (1–5 μM) and high (25–50 μM) Ca2+ concentrations inhibited mitochondrial respiration in control seedlings, whereas 10 μM Ca2+ enhanced respiration in state 4 and reduced indices characterizing coupling (respiratory control (RC) and ADP: O ratio). At concentrations of 6–20 and 50 μM, Ca2+ ions suppressed CSP310 uncoupling effect, which reduced the rate of respiration and an increase in the RC and ADP: O ratio. Low-temperature stress and exogenous CSP310 induced cytochrome c leakage from winter wheat mitochondria both in the absence of Ca2+ and in the presence of its low concentrations.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: May 15, 2006

References

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