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.
Russian Journal of Plant Physiology – Springer Journals
Published: May 15, 2006
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