AOBPreview originally published online on October 7, 2008
Annals of Botany 2008 102(6):935-943; doi:10.1093/aob/mcn185
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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
1 Department of Plant Ecology and Biodiversity, Institute of Environmental Biology, Utrecht University, PO Box 80084, 3508 TB Utrecht, The Netherlands
2 Department of Experimental Plant Ecology, Radboud University, Toernooiveld 1, Nijmegen 6525 ED, The Netherlands
* For correspondence: E-mail p.j.vermeulen{at}uu.nl
Received: 11 June 2008 Returned for revision: 28 July 2008 Accepted: 19 August 2008 Published electronically: 7 October 2008
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 (
mass) 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.
Key words: Potentilla reptans, light, competition, symmetric, clonal, genotype, investment, petiole, canopy, allocation
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