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Morphological characteristics of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju in laboratory cultures

Shafik, H. M. (2003) Morphological characteristics of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju in laboratory cultures. Acta Biologica Hungarica, 54 (1). pp. 121-136. ISSN 0236-5383

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Abstract

The freshwater cyanoprokaryote Cylindrospermopsis raciborskii has become increasingly prevalent in tropical and temperate water bodies worldwide. The morphological characteristics of this species were investigated under different growth rates in continuous cultures (at steady state) and in batch (phosphorus starved) cultures with different mineral nitrogen forms. The species displays an enormous morphological variability under controlled condition. The occurrence of extreme long twisted filaments was found near the maximum growth rate and under high ammonium concentration. Rarely the heterocytes of Cylindrospermopsis raciborskii arise intercalarly between two neighboring cells (i.e. intercalary heterocytes were found). The morphological features are highly effected by environmental conditions and nutrient availability. Under P-starvation extreme morphology appeared. The specifications of C. africana and C. cuspis overlap with that of C. raciborskii accordingly this is not clear characteristic feature to distinguish species. A pure culture of a pro- or eukaryote alga growing in continuous cultures is a good method for giving a suitable overview on all morphological possibilities of a tested organism.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz
Depositing User: Endre Sarvay
Date Deposited: 13 Nov 2017 14:38
Last Modified: 13 Nov 2017 14:38
URI: http://real.mtak.hu/id/eprint/69802

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