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Which plant traits promote growth in the low-light regimes of vegetation gaps?

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Abstract

Nine temperate grass species were screened for their potential to grow in the low-light conditions typical of gaps in dense vegetation. To this end, photosynthetic photon flux densities (PFD) were simulated in a growth chamber (PFD 100, 50 or 25 μmol photons m−2 s−1). Relative and absolute growth rates (RGR and AGR, respectively) of the species were regressed on ten different ecophysiological and morphogenetic plant attributes. No significant relationships were found between plant attributes and relative growth rate, while six attributes explained a significant proportion of the interspecific variance in absolute biomass growth: net photosynthetic rate at growth PFD (P net ) (75.5%), leaf apparent quantum yield of CO2 fixation (62.5%), leaf dark respiration rate (65.2%), leaf compensation PFD (71.0%), root: shoot ratio (66.4%) and plant nitrogen content on a mass basis (42.0%). Only species with extremely low allocation to roots and very high (relatively speaking) net photosynthetic rates were able to grow fast in low light. Specific leaf area (SLA), instantaneous photosynthetic nitrogen use efficiency (PNUE) and leaf nitrogen content on a mass basis as well as on an area basis were not significantly related to growth. The absence of effects of plant traits on RGR, unlike for AGR, could arise from a relationship that we observed between AGR and a fitted start value of the biomass-time course (i.e. seed mass or germination time). This suggests that interspecific differences in the very early growth stages of the plants were responsible for differences in successful development under low light, rather than differences in RGR. Based on its high explanatory power, its relative constancy with plant age and the lack of effect of growth PFD, P net would be the best candidate for characterizing potentially shade-tolerant species that are likely to establish in dense vegetation in the field.

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Acknowledgements

This research was supported by the Federal Office for Scientific, Technical and Cultural Affairs (Prime Minister’s Office, Brussels, Belgium) under the Programme SPSD II. A. Milbau currently holds a grant from FWO-Vlaanderen as a post-doctoral researcher.

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Authors and Affiliations

  1. Department of Plant Physiology and Anatomy, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic

    L. Seidlova & J. Gloser

  2. Research Group Plant and Vegetation Ecology, Department of Biology, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Belgium

    M. Verlinden, A. Milbau & I. Nijs

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  1. L. Seidlova
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  2. M. Verlinden
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  3. J. Gloser
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Correspondence to M. Verlinden.

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Seidlova, L., Verlinden, M., Gloser, J. et al. Which plant traits promote growth in the low-light regimes of vegetation gaps?. Plant Ecol 200, 303–318 (2009). https://doi.org/10.1007/s11258-008-9454-6

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