Thalassiosira rotula

Dongmann, G. and H.W. Numberg. 1982. Observations with Thalassiosira rotula (Menier) on the toxicity and accumulation of cadmium and nickel. Ecotoxicol. Environ. Safety 6 535-544. 

Phytoplanktonic microalgae, which are important sources of food in both oceans and fresh water habitats, use an activated form of chemical defense to reduce grazing by predators. Damaged microalgal cells convert unsaturated fatty acids into unsaturated aldehydes which affect reproductive outcomes in herbivorous cope-pods and other planktonic grazers.30 Representative products of these biotransformations include the C10 aldehydes 1 and 2 in the diatom Thalassiosira rotula, and Cg diene hydrocarbons and the trienoic acid aldehyde 3 in Asterionella formosa.31... 

This was possible to detect because the monoculture of Thalassiosira rotula employed showed partly synchronized cell divisions during exponential growth. Brockmann et al. [137] carried out combined measurements of dissolved amino acids and carbohydrates. Glucose and lysine occurred in highest concentrations. Mague et al., [22] found that extracellular production of free amino acids counted for 7.1% of the of the total extracellular C released in an exponentially growing culture of S. costatum Myklestad et al., [26] measured 10.7% for C. affinis or 3.6% when calculated as percent of total incorporated cell N. In contrast to this Admiraal et al., [139] found that none of three benthic diatoms released more than 0.1 % of the cellular N as free amino acids and concluded that benthic diatoms may act as net consumers of amino acids. Several authors did measure both intracellular and extracellular concentrations of many amino acids [22 140 -142]. The clear difference in relative composition of intracellular and extracellular fractions as pointed out by the first mentioned of these authors, show that the released pool is not just a portion of the intact cells content. 

Figure 9.10 Biosynthesis of volatile aldehydes and acids by Thalassiosira rotula (Barofsky and Pohnert, 2007).

Under conditions of stress, the spedes Thalassiosira rotula produces volatile aldehydes and adds which are... 

Barofsky, A. and Pohnert, G. (2007) Biosynthesis of polyunsaturated short chain aldehydes in the diatom Thalassiosira rotula. Oig. Lett., 9, 1017-1020. 

Cutignano, A., d lppohto, G., Romano, G., Lamari, N., Cimino, G., Febbraio, F., and Fontana, A. (2006) Chloroplastic glycolipids fuel aldehyde biosynthesis in the marine diatom Thalassiosira rotula. ChemBioChem., 7, 450-456. 

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