Substantial intraspecific genome size variation in golden-brown algae and its phenotypic consequences.

Annals of Botany
Dora Čertnerová, Pavel Škaloud

Abstract

While nuclear DNA content variation and its phenotypic consequences have been well described for animals, vascular plants and macroalgae, much less about this topic is known regarding unicellular algae and protists in general. The dearth of data is especially pronounced when it comes to intraspecific genome size variation. This study attempts to investigate the extent of intraspecific variability in genome size and its adaptive consequences in a microalgal species. Propidium iodide flow cytometry was used to estimate the absolute genome size of 131 strains (isolates) of the golden-brown alga Synura petersenii (Chrysophyceae, Stramenopiles), identified by identical internal transcribed spacer (ITS) rDNA barcodes. Cell size, growth rate and genomic GC content were further assessed on a sub-set of strains. Geographic location of 67 sampling sites across the Northern hemisphere was used to extract climatic database data and to evaluate the ecogeographical distribution of genome size diversity. Genome size ranged continuously from 0.97 to 2.02 pg of DNA across the investigated strains. The genome size was positively associated with cell size and negatively associated with growth rate. Bioclim variables were not correlated with genom...Continue Reading

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Citations

Feb 22, 2021·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Dora Čertnerová, David W Galbraith
Jul 25, 2021·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Dora Čertnerová
Sep 30, 2021·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Elwira SliwinskaDavid W Galbraith

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