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The use of internal nitrogen stores in the rhizomatous grass Calamagrostis epigejos during regrowth after defoliation.

Abstract：

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 (approximately 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.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Kavanová M,Gloser V

doi

10.1093/aob/mci054

keywords:

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

457-63

issue

3

eissn

0305-7364

issn

1095-8290

pii

mci054

journal_volume

95

pub_type

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