For standardized desiccation experiments, a new methodological approach with silica gel filled polystyrol boxes and effective quantum yield measurements from the outside were successfully applied. All Interfilum isolates showed a decrease and inhibition of the effective quantum yield under this treatment, however with different kinetics. While the single cell strains exhibited relatively fast inhibition, the cell packet forming isolates dried slower. Most strains fully recovered effective quantum
yield after rehydration. All Interfilum isolates exhibited optimum photosynthesis at low photon fluence rates, but with no indication of photoinhibition under high light conditions suggesting flexible acclimation mechanisms of the photosynthetic machinery. Photosynthesis under lower temperatures was PCI-32765 in vitro generally more active than respiration, while the opposite was true for higher temperatures. The presented data provide an explanation for the regular occurrence of Interfilum species in soil habitats where environmental factors can be particularly
harsh. “
“The Erythropeltidales are a common group of small, mostly epiphytic, marine red algae. Morphologically, they can be divided into two main groups: species that are crustose and species that are upright. Being morphologically simple, generic boundaries and evolutionary trends are controversial or unknown. We focus our molecular phylogenetic analysis on members that are crustose using samples collected from around the world and placed in unialgal culture. Our data indicate that one upright
Selleckchem Decitabine genus, Porphyropsis, is closely related to crustose genera and that the upright habit evolved at least twice in the order. In addition, the MCE genus Sahlingia is supported as distinct from Erythrocladia. Within samples identified as Erythrocladia, three groups are distinguished: Erythrocladia, composed of crustose aggregating filaments with pyrenoids; Pseudoerythrocladia gen. nov., crustose aggregating filaments without pyrenoids, a sister genus to Porphyropsis also without pyrenoids; and Madagascaria gen. nov., a sister genus to all other Erythropeltidales samples that is only subtly different from Erythrocladia. Within these genera, no clear morphological groups are evident, nor is the level of molecular diversity suggestive of multiple species. We suggest that described species, especially in the genus Erythrocladia, are just morphological variants, due to substrate or environmental variation, and further descriptions of these morphologically simple algae must incorporate molecular data and standardized culture conditions. “
“We report the production of large numbers of transparent exopolymer particles (TEP) from polysaccharidic capsules of Anabaena spiroides Kleb. in cultures.
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