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AOBPreview originally published online on August 16, 2009
Annals of Botany 2009 104(6):1057-1067; doi:10.1093/aob/mcp198
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© The Author 2009. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Intraspecific variation in the magnitude and pattern of flooding-induced shoot elongation in Rumex palustris

Xin Chen1,*, Heidrun Huber1, Hans de Kroon1, Anton J. M. Peeters2, Hendrik Poorter2, Laurentius A. C. J. Voesenek2 and Eric J. W. Visser1

1 Department of Experimental Plant Ecology, Institute for Water and Wetland Research, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
2 Department of Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands

* For correspondence. E-mail Xin.Chen{at}science.ru.nl

Received: 27 April 2009    Returned for revision: 18 May 2009    Accepted: 13 July 2009    Published electronically: 14 August 2009

Background and Aims: Intraspecific variation in flooding tolerance is the basic pre-condition for adaptive flooding tolerance to evolve, and flooding-induced shoot elongation is an important trait that enables plants to survive shallow, prolonged flooding. Here an investigation was conducted to determine to what extent variation in flooding-induced leaf elongation exists among and within populations of the wetland species Rumex palustris, and whether the magnitude of elongation can be linked to habitat characteristics.

Methods: Offspring of eight genotypes collected in each of 12 populations from different sites (ranging from river mudflats with dynamic flooding regimes to areas with stagnant water) were submerged, and petioles, laminas and roots were harvested separately to measure traits related to elongation and plant growth.

Key Results: We found strong elongation of petioles upon submergence, and both among- and within-population variation in this trait, not only in final length, but also in the timing of the elongation response. However, the variation in elongation responses could not be linked to habitat type.

Conclusions: Spatio-temporal variation in the duration and depth of flooding in combination with a presumably weak selection against flooding-induced elongation may have contributed to the maintenance of large genetic variation in flooding-related traits among and within populations.

Key words: Flooding tolerance, intraspecific variation, shoot elongation, lamina elongation, petiole elongation, population differentiation, Rumex palustris, submergence


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