Publication details

Effect of phosphorus availability on the selection of species with different ploidy levels and genome sizes in a long-term grassland fertilization experiment

Authors

ŠMARDA Petr HEJCMAN Michal BŘEZINOVÁ Alexandra HOROVÁ Lucie STEIGEROVÁ Helena ZEDEK František BUREŠ Petr HEJCMANOVÁ Pavla SCHELLBERG Juergen

Year of publication 2013
Type Article in Periodical
Magazine / Source New Phytologist
MU Faculty or unit

Faculty of Science

Citation
Web odkaz na článek na stránkách časopisu
Doi http://dx.doi.org/10.1111/nph.12399
Field Botany
Keywords DNA content; flow cytometry; nutrient limitation; phosphorus; plant primary CSR strategies; polyploid ecology; polyploidy; Rengen Grassland Experiment
Description Polyploidy and increased genome size are hypothesized to increase organismal nutrient demands, namely of phosphorus (P), which is an essential and abundant component of nucleic acids. Therefore, polyploids and plants with larger genomes are expected to be selectively disadvantaged in P-limited environments. However, this hypothesis has yet to be experimentally tested. We measured the somatic DNA content and ploidy level in 74 vascular plant species in a long-term fertilization experiment. The differences between the fertilizer treatments regarding the DNA content and ploidy level of the established species were tested using phylogeny-based statistics. The percentage and biomass of polyploid species clearly increased with soil P in particular fertilizer treatments, and a similar but weaker trend was observed for the DNA content. These increases were associated with the dominance of competitive life strategy (particularly advantageous in the P-treated plots) in polyploids and the enhanced competitive ability of dominant polyploid grasses at high soil P concentrations, indicating their increased P limitation. Our results verify the hypothesized effect of P availability on the selection of polyploids and plants with increased genome sizes, although the relative contribution of increased P demands vs increased competitiveness as causes of the observed pattern requires further evaluation.
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