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JXB Advance Access originally published online on August 28, 2009
Journal of Experimental Botany 2009 60(15):4335-4345; doi:10.1093/jxb/erp268
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Differences in C metabolism of ash species and provenances as a consequence of root oxygen deprivation by waterlogging

Carsten Jaeger1,*, Arthur Gessler2, Steffen Biller1, Heinz Rennenberg1 and Jürgen Kreuzwieser1

1Institut für Forstbotanik und Baumphysiologie, Professur für Baumphysiologie, Georges-Köhler-Allee 053, D-79110 Freiburg i. B., Germany
2Core Facility Metabolomics, Centre for System Biology (ZBSA), Habsburgerstr. 49, D-79110 Freiburg i. B., Germany

* To whom correspondence should be addressed. E-mail: carsten.jaeger{at}ctp.uni-freiburg.de

The waterlogging tolerance and the physiological responses to this stress were tested in seedlings of Fraxinus angustifolia, an ash tree inhabiting riparian forests, and two provenances of the closely related Fraxinus excelsior, one derived from a riparian forest (FER) and one from a mountainous region (FEM). Besides visible damage, physiological parameters reflecting adaptations of plants to waterlogging such as net CO2 assimilation, alcoholic fermentation, and the concentrations of metabolites related to flooding responses were studied. Consistent with the higher flooding tolerance of F. angustifolia and FER compared with FEM, net assimilation remained unaffected in F. angustifolia, was slightly reduced in FER, but was strongly affected in FEM. Altered carbohydrate concentrations in the roots of the seedlings suggest differences in the ability to supply alcoholic fermentation with substrate during prolonged periods of soil anoxia. Another difference between the seedlings was connected to the {gamma}-aminobutyric acid (GABA) shunt which resulted in alanine accumulation in the flooding-tolerant trees, but strong GABA accumulation in the more sensitive FEM seedlings. This finding indicates differences in GABA conversion into alanine which might result in an accumulation of phytotoxic levels of intermediates. Such provenance-specific differences in Common ash suggest that the selection of appropriate provenances is essential for forest management in flood-prone areas.

Key words: Ash provenances, assimilation, carbon metabolism, flooding, oxygen deficiency, waterlogging

Received 4 April 2009; Revised 3 August 2009 Accepted 13 August 2009


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