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KMID : 0903519940370060433
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1994 Volume.37 No. 6 p.433 ~ p.440
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A Mechanistic Study on the Early Stage - Events Involved in Low Temperature Stress in Clamydomonas reinhardtii
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Abstract
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The exposure of Clamydnmonas reinhardtii to low temperatures resulted in an accumulation of cellular pyruvate that dissipated when the chilled cells returned to ambient temperature. The dissipation of pyruvate accumulation was accompanied by an increase in the production level of superoxide radicals (O₂) in cells. The formation of O₂ at an excessive level during the post-chilling period was apparently countered by a substantial activation of superoxide dismutase (SOD). All these results are similar to those observed previously in rice seedlings subjected to the cold-treatment, implicating that a common mechanism is probably underlying for the primary processes of chilling injury both in higher plants and in algae. It was also observed that the activation of Mn-containing SOD contributes the major share in the increase of SOD activity of whole algal cells. Because Mn-SOD is present only in mitochondria, the observation corroborates the concept that the O₂ scavenging enzyme would be induced to cope with the cold treatment-caused adverse situation in mitochondria where the toxic active oxygen is produced at rates far exceeding the normal rate.
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