Journal Article

Leaf Investment and Light Partitioning among Leaves of Different Genotypes of the Clonal Plant <i>Potentilla reptans</i> in a Dense Stand after 5 Years of Competition

Peter J. Vermeulen, Josef F. Stuefer, Heinjo J. During and Niels P. R. Anten

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 102, issue 6, pages 935-943
Published in print December 2008 | ISSN: 0305-7364
Published online October 2008 | e-ISSN: 1095-8290 | DOI: https://dx.doi.org/10.1093/aob/mcn185
Leaf Investment and Light Partitioning among Leaves of Different Genotypes of the Clonal Plant Potentilla reptans in a Dense Stand after 5 Years of Competition

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Background and Aims

While within-species competition for light is generally found to be asymmetric – larger plants absorbing more than proportional amounts of light – between-species competition tends to be more symmetric. Here, the light capture was analysed in a 5-year-old competition experiment that started with ten genotypes of the clonal plant Potentilla reptans. The following hypotheses were tested: (a) if different genotypes would do better in different layers of the canopy, thereby promoting coexistence, and (b) if leaves and genotypes with higher total mass captured more than proportional amounts of light, possibly explaining the observed dominance of the abundant genotypes.

Methods

In eight plots, 100 leaves were harvested at various depths in the canopy and their genotype determined to test for differences in leaf biomass allocation, leaf characteristics and the resulting light capture, calculated through a canopy model using the actual vertical light and leaf area profiles. Light capture was related to biomass to determine whether light competition between genotypes was asymmetric.

Key Results

All genotypes could reach the top of the canopy. The genotypes differed in morphology, but did not differ significantly in light capture per unit mass (Φmass) for leaves with the laminae placed at the same light levels. Light capture did increase disproportionately with leaf mass for all genotypes. However, the more abundant genotypes did not capture disproportionately more light relative to their mass than less-abundant genotypes.

Conclusions

Vertical niche differentiation in light acquisition does not appear to be a factor that could promote coexistence between these genotypes. Contrary to what is generally assumed, light competition among genetic individuals of the same species was size-symmetric, even if taller individual leaves did capture disproportionately more light. The observed shifts in genotype frequency cannot therefore be explained by asymmetric competition for light.

Keywords: Potentilla reptans; light; competition; symmetric; clonal; genotype; investment; petiole; canopy; allocation

Journal Article.  5981 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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