Temperature and salinity tolerances of geographically separated Phaeodactylum tricornutum Böhlin strains: maximum quantum yield of primary photochemistry, pigmentation, proline content and growth
-
Gudrun Kräbs
and
Claudia Büchel
Abstract
To determine eco-physiological responses of three geographically separate strains of Phaeodactylum tricornutum, we exposed cultures of each strain to a combination of temperatures ranging from 12°C to 30°C and salinities from 5 to 130. Generally, the three strains were eurythermal and very euryhaline, especially when measured as maximum quantum yield of primary photochemistry. However, a decline in pigmentation under both hypo- and hyper-saline conditions tracked diminishing growth-rates. Under hyper-saline conditions, growth rates were further reduced as more proline was accumulated in each cell. In salinities >90 at 30°C, the physiological response was reduced to mere cell survival. Regulation of pigmentation and the time-course of both proline accumulation and growth were similar in the two cold-temperate strains from Vancouver and Plymouth, but different in the tropical strain from Guam, mirroring an epigenetic manifestation of environmental influences. In contrast, the tolerance ranges of all three strains seemed to be determined by phylogenetic background. Thus, the cold-temperate strain from Plymouth and the tropical strain from Guam, which are in the same phylogenetic group, had broader salinity and temperature tolerance ranges than the cold-temperate strain from Vancouver, which is in a neighbouring clade.
©2011 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Research Articles
- Macroalgal competition and invasive success: testing competition in mixed canopies of Sargassum muticum and Saccharina latissima
- Temperature and salinity tolerances of geographically separated Phaeodactylum tricornutum Böhlin strains: maximum quantum yield of primary photochemistry, pigmentation, proline content and growth
- Phytoplankton diversity during the spring bloom in the northwestern Mediterranean Sea
- Taxonomic notes on Caribbean Neosiphonia and Polysiphonia (Ceramiales, Florideophyceae): five species from Florida, USA and Mexico
- Notes on the benthic marine algae of Puerto Rico. X. Additions to the flora
- Cloning and analysis of the full-length Rubisco large subunit (rbc L) cDNA from Ulva linza (Chlorophyceae, Chlorophyta)
- Identification of microRNA precursors in Bruguiera spp.
- A reclassification of Mycophycias ascophylli (Ascomycota) based on nuclear large ribosomal subunit DNA sequences
- Solute accumulation and osmotic adjustment characteristics of the mangrove Avicennia marina under NaCl-induced salinity stress
