Effects of soil nitrogen on diploid advantage in fireweed, Chamerion angustifolium (Onagraceae)

Ecology and Evolution
Alex L Bales, Erika I Hersch-Green

Abstract

In many ecosystems, plant growth and reproduction are nitrogen limited. Current and predicted increases of global reactive nitrogen could alter the ecological and evolutionary trajectories of plant populations. Nitrogen is a major component of nucleic acids and cell structures, and it has been predicted that organisms with larger genomes should require more nitrogen for growth and reproduction and be more negatively affected by nitrogen scarcities than organisms with smaller genomes. In a greenhouse experiment, we tested this hypothesis by examining whether the amount of soil nitrogen supplied differentially influenced the performance (fitness, growth, and resource allocation strategies) of diploid and autotetraploid fireweed (Chamerion angustifolium). We found that soil nitrogen levels differentially impacted cytotype performance, and in general, diploids were favored under low nitrogen conditions, but this diploid advantage disappeared under nitrogen enrichment. Specifically, when nitrogen was scarce, diploids produced more seeds and allocated more biomass toward seed production relative to investment in plant biomass or total plant nitrogen than did tetraploids. As nitrogen supplied increased, such discrepancies between cyto...Continue Reading

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Citations

Aug 28, 2020·Proceedings. Biological Sciences·Julie Blommaert
Jun 3, 2021·The Plant Journal : for Cell and Molecular Biology·Xiaotong WangAndrew R Leitch
Jul 6, 2021·Trends in Plant Science·Lubna FaizullahIlia J Leitch

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Methods Mentioned

BETA
flow cytometry

Software Mentioned

CFlow Plus Analysis
JMP
R

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