Abstract
In the present paper we investigated the polyamine content and protein expression pattern in laboratory-reared Skeletonema costatum (Grev.) Cleve under temperature stress conditions. Putrescine, spermidine and to a lesser extent spermine were present in this alga. Free putrescine and spermidine increased after heat shock while a concomitant decrease in trichloroacetic acid (TCA)-soluble bound putrescine and spermidine occurred. After 40 min of 30 °C stress both were no longer detectable, whereas TCA-soluble bound spermine was present. The appearance of 83, 42, 40.7 and 35 kDa polypeptides was observed when S. costatum cells were subjected to heat treatment. Western blotting experiments revealed the presence in this diatom of ubiquitin and ubiquitin conjugates. Heat stress strongly increased the number of ubiquitin conjugate polypeptides of high molecular weight. No variation in the carbohydrate content was observed in response to stress. A possible role for these different metabolic events in the adaptive response of S. costatum to rapid temperature shifts has been hypothesized.
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Communicated by M. Sarà, Genova
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Scoccianti, V., Penna, A., Penna, N. et al. Effect of heat stress on polyamine content and protein pattern in Skeletonema costatum . Marine Biology 121, 549–554 (1995). https://doi.org/10.1007/BF00349465
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DOI: https://doi.org/10.1007/BF00349465