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AOBPreview originally published online on December 14, 2004
Annals of Botany 2005 95(3):457-463; doi:10.1093/aob/mci054
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Annals of Botany 95/3 © Annals of Botany Company 2004; all rights reserved

The Use of Internal Nitrogen Stores in the Rhizomatous Grass Calamagrostis epigejos During Regrowth After Defoliation

MONIKA KAVANOVÁ{dagger} and VÍT GLOSER*

Department of Plant Physiology and Anatomy, Faculty of Science, Masaryk University, Kotlárská 2, 611 37 Brno, Czech Republic

* For correspondence. E-mail VitGloser{at}sci.muni.cz

Received: 30 July 2004    Returned for revision: 21 September 2004    Accepted: 26 October 2004    Published electronically: 14 December 2004

• Background and Aims The regrowth dynamics after defoliation of the invasive grass Calamagrostis epigejos were studied. As nitrogen (N) reserves have been shown to play an important role during plant regrowth, the identity, location and relative importance for regrowth of N stores were determined in this rhizomatous grass.

• Methods Plant growth, nitrate uptake and root respiration were followed during recovery from defoliation. Water soluble carbohydrates, nitrate, free amino acids and soluble proteins were analysed in the remaining organs.

• Key Results Nitrate uptake and root respiration were severely reduced during the first days of regrowth. Roots were the main net source of mobilized N. The quantitatively dominant N storage compounds were free amino acids. Free amino acids and soluble proteins in the roots decreased by 55 and 50 %, respectively, and a substantial (~38 %) decrease in stubble protein was also observed. Although the relative abundance of several soluble proteins in roots decreased during the initial recovery from defoliation, no evidence was found for vegetative storage protein (VSP). Furthermore, rhizomes did not act as a N storage compartment.

• Conclusions Production of new leaf area was entirely reliant, during the first week after defoliation, on N stores present in the plant. Mobilized N originated mainly from free amino acids and soluble proteins located in roots, and less so from proteins in stubble. Presence of VSP in the roots was not confirmed. The data suggest that rhizomes played an important role in N transport but not in N storage.

Key words: Calamagrostis epigejos L. Roth, invasive species, nitrate uptake, N storage, N mobilization, N reserves, rhizome, root respiration, vegetative storage protein, VSP


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