Red Algae (Rhodophyta) in Rivers

NecchiJr., Orlando

doi:10.1007/978-3-319-31984-1_4

Cited by 12 publications

(2 citation statements)

References 28 publications

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“…Associations with morphological traits within the order were not possible at this stage, since genera with similar vegetative morphology, for example, Batrachospermum , Kumanoa , Sirodotia, and Sheathia , were placed in distinct clades. For reproductive characters, no clear grouping were evident, with taxa like Batrachospermum macrosporum and Sheathia arcuata , which share the presence of straight and long carpogonial branches and stalked carposporophytes (Necchi ), positioned in different clades. A more representative set of taxa should be analyzed to propose a sound and universal infra‐ordinal classification for the Batrachospermales.…”

Section: Discussionmentioning

confidence: 99%

Organization of plastid genomes in the freshwater red algal order Batrachospermales (Rhodophyta)

Paiano

Cortona

Costa

et al. 2017

Journal of Phycology

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Little is known about genome organization in members of the order Batrachospermales, and the infra‐ordinal relationship remains unresolved. Plastid (cp) genomes of seven members of the freshwater red algal order Batrachospermales were sequenced, with the following aims: (i) to describe the characteristics of cp genomes and compare these with other red algal groups; (ii) to infer the phylogenetic relationships among these members to better understand the infra‐ordinal classification. Cp genomes of Batrachospermales are large, with several cases of gene loss, they are gene‐dense (high gene content for the genome size and short intergenic regions) and have highly conserved gene order. Phylogenetic analyses based on concatenated nucleotide genome data roughly supports the current taxonomic system for the order. Comparative analyses confirm data for members of the class Florideophyceae that cp genomes in Batrachospermales is highly conserved, with little variation in gene composition. However, relevant new features were revealed in our study: genome sizes in members of Batrachospermales are close to the lowest values reported for Florideophyceae; differences in cp genome size within the order are large in comparison with other orders (Ceramiales, Gelidiales, Gracilariales, Hildenbrandiales, and Nemaliales); and members of Batrachospermales have the lowest number of protein‐coding genes among the Florideophyceae. In terms of gene loss, apcF, which encodes the allophycocyanin beta subunit, is absent in all sequenced taxa of Batrachospermales. We reinforce that the interordinal relationships between the freshwater orders Batrachospermales and Thoreales within the Nemaliophycidae is not well resolved due to limited taxon sampling.

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Section: Discussionmentioning

confidence: 99%

Organization of plastid genomes in the freshwater red algal order Batrachospermales (Rhodophyta)

Paiano

Cortona

Costa

et al. 2017

Journal of Phycology

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“…Most of these freshwater red algae are found in light- and nutrient-poor running waters and accordingly, their ecophysiological adaptations differ from those of most marine red algae. However, freshwater Rhodophyta are important constituents in river ecosystems, where they can be abundant and widely distributed (Necchi, 2016). Three freshwater red algae, Compsopogon caeruleus , Kumanoa mahlacensis , and Batrachospermum turfosum (Sheath & Vis, 2015), are typical inhabitants of lentic freshwater bodies, such as lakes and ponds.…”

Section: Introductionmentioning

confidence: 99%

The freshwater red algaBatrachospermum turfosum(Florideophyceae) can acclimate to a wide range of light and temperature conditions

Aigner

Holzinger

Karsten

et al. 2017

European Journal of Phycology

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Batrachospermum turfosum Bory is one of the generalists among the few red algae that have adapted to freshwater habitats, occurring in a variety of primarily shaded, nutrient-poor microhabitats with lotic (running) or lentic (standing) waters. Seasonal variations in water level and canopy cover can expose this sessile alga to widely fluctuating temperatures, solar irradiation and nutrient availability. Here we report on the ecophysiology of B. turfosum collected from an ultraoligotrophic bog pool in the Austrian Alps. Photosynthesis as a function of photon fluence density (PFD) and temperature was studied by measuring oxygen evolution in combination with chlorophyll fluorescence. In addition, the effects of ultraviolet radiation (UVR) on photosynthetic pigments were analysed using HPLC and spectrophotometric methods, and cellular ultrastructure was studied using transmission electron microscopy. We found that B. turfosum is adapted to low light, with a light compensation point (I c ) and a light saturation point (I k ) of 8.4 and 29.7 μmol photons m -2 s -1 , respectively, but also tolerates higher PFDs of ~1000 μmol photons m -2 s -1 , and is capable of net photosynthesis at temperatures between 5°C and 35°C. Exposure to either UV-A or UV-AB for 102 h led to a strong transient drop in effective quantum yield (ΔF/F M '), followed by an acclimation to about 70% of initial ΔF/F M ' values. Ultrastructural changes included the accumulation of plastoglobules and dilated membranes after UVR treatment. Although all photosynthetic pigments strongly decreased upon UVR exposure and no UV-photoprotectants (e.g. mycosporine-like amino acids) could be detected, the alga was capable of recovering ΔF/F M ' and phycobiliproteins after UVR treatment. In summary, B. turfosum tolerates a wide range of irradiation and temperature regimes, and these traits may be the basis for its successful adaptation to challenging environments.

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History of Freshwater Red Algal Studies; Taxonomic Diversity and Phylogeny; Biogeographic Trends; Collection of Freshwater Red Algae; Scope and Organization of This Book

Necchi

Vis

2021

Freshwater Red Algae

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Red Algae (Rhodophyta) in Rivers

Cited by 12 publications

References 28 publications

Organization of plastid genomes in the freshwater red algal order Batrachospermales (Rhodophyta)

Organization of plastid genomes in the freshwater red algal order Batrachospermales (Rhodophyta)

The freshwater red algaBatrachospermum turfosum(Florideophyceae) can acclimate to a wide range of light and temperature conditions

History of Freshwater Red Algal Studies; Taxonomic Diversity and Phylogeny; Biogeographic Trends; Collection of Freshwater Red Algae; Scope and Organization of This Book

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