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Shoot density of<Emphasis Type="Italic"> Carex rostrata</Emphasis> Stokes in relation to internal carbon:nitrogen balance
Authors:T Saarinen  P Haansuu
Institution:(1) Department of Ecology and Systematics, University of Helsinki, Unioninkatu 44, P.O. Box 7, FIN-00014 Helsinki, Finland e-mail: Timo.Saarinen@Helsinki.fi Fax: +358-9-1918656, FI
Abstract:Initiation of new shoots originating from basal meristems of older shoots of Carex rostrata was studied in relation to the internal carbon/nitrogen balance. In a greenhouse experiment, individual shoots with a vigorous formation of a new shoot contained the highest concentrations of free amino acids (FAA) and the lowest concentrations of total nonstructural carbohydrates (TNC), resulting in a low TNC/FAA ratio. Thus shoots with high availability of nitrogenous compounds in relation to carbohydrates started growing a new shoot. The results suggest that TNC/FAA ratios could affect shoot densities. Field measurements supported this view: TNC/FAA ratios were lower in a mesotrophic site with a high density of shoots than in an oligotrophic site with a low density of shoots. Compared with roots, TNC/FAA ratios of shoots seemed to be more decisive both in the greenhouse experiment and in the field. In the greenhouse experiment, initiation of new shoots was measured in fragmented shoots of Carex having no intraclonal connections. Even if physiological integration was lacking due to fragmentation, shoot initiation was efficiently controlled in relation to the internal carbon/nitrogen balance. Received: 14 May 1998 / Accepted: 25 August 1999
Keywords:  Free amino acids  Growth triggering  Nonstructural carbohydrates  Shoot growth  TNC/FAA ratio
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