Abstract
Growth of Scenedesmus species and strains, grown for 28 days in mineral BBM medium in batch-cultures, displayed sigmoidal kinetics that comprised a lag, exponential and declining growth phases. Total SOD activity in these autotrophically cultured organisms, which oscillated within 0.6 – 1.4 Umg protein−1, was rather species-specific and only to some extent depended on the growth phase. Contrary, three S. obliquus strains: wild type 276-6, mutant with blocked PS I (strain 56.80) and mutant with blocked PS II (strain 57.80), cultured for 7 days on BBM medium supplemented with bacto-tryptone and yeast extract (BBM+) turned out to be time-dependent and to have several times higher total SOD activity than one obtained for Scenedesmus grown autotrophically. Regardless of the media composition, the phase of growth and studied organism, dominant isoforms of total SOD were together determined Fe- and Mn-SOD.
Profiles of SOD isoforms, obtained after PAGE analysis of all autotrophically and exponentially growing organisms, revealed that one Mn-SOD and one Cu/Zn-SOD bands located on gels at the same position whereas location of three bands of Fe-SOD depended on the strain. This suggests the presence of two different groups of Fe-SODs in analyzed organisms. Identical SOD profiles found in two S. armatus strains (276-4a and 276-4d) and S. subspicatus correspond well with their taxonomic position. The SOD profile of S. armatus B1-76 distinctly differed from two other S. armatus strains but was identical to S. microspinal B1-76 and S. quadricauda G-15 despite the fact that there were significant growth rate differences between these three species. SODs profiles of S. acutus 437 and S. obliguus 453 were species-specific. In S. obliquus strains cultured on BBM+ medium, there are four SOD bands: one slightly visible band of Mn-SOD, two intensive bands of Fe-SOD and one band of Cu/Zn-SOD. The above finding suggests that antioxidant response of algae kept in batch-cultures differs according to medium composition and the SOD activity mainly restricted to chloroplasts.
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Abbreviations
- BBM:
-
Bold Basal Medium
- BBM+:
-
medium supplemented with bacto-tryptone and yeast extract
- E-64:
-
L-trans epoxysuimynyl leucynamlido 4 guamidyno butane
- EDTA:
-
Ethylenediaminetetrateric acid
- DIC:
-
Dissolved inorganic carbon
- DTT:
-
Dithiotheritol
- PAR:
-
Photosynthetically active radiation
- PMSF:
-
Phenylmethanesulphonyl fluoride
- PMSF:
-
Phenylmethanesulphonyl fluoride
- NBT:
-
Nitroblue tetrazolium
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- TEMED:
-
N,N,N′,N′-Tetramethyl-ethylendiamin
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Pokora, W., Reszka, J. & Tukaj, Z. Activities of superoxide dismutase (SOD) isoforms during growth of Scenedesmus (chlorophyta) species and strains grown in batch-cultures. Acta Physiol Plant 25, 375–384 (2003). https://doi.org/10.1007/s11738-003-0019-y
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DOI: https://doi.org/10.1007/s11738-003-0019-y