The Plant's Capacity in Regulating Resource Demand

R. Matyssek; R. Agerer; D. Ernst; J.-C. Munch; W. Oßwald; H. Pretzsch; E. Priesack; H. Schnyder; D. Treutter

doi:10.1055/s-2005-872981

Plant Biology, Inhaltsverzeichnis

Plant Biol (Stuttg) 2005; 7(6): 560-580
DOI: 10.1055/s-2005-872981

Review Article

Georg Thieme Verlag Stuttgart KG · New York

The Plant's Capacity in Regulating Resource Demand

R. Matyssek¹ , R. Agerer² , D. Ernst³ , J.-C. Munch⁴ , W. Oßwald⁵ , H. Pretzsch⁶ , E. Priesack⁷ , H. Schnyder⁸ , D. Treutter⁹

¹Ecophysiology of Plants, Technische Universität München, Am Hochanger 13, 85354 Freising-Weihenstephan, Germany
²Biodiversity Research/Mycology, University of Munich, Menzinger Straße 67, 80638 München, Germany
³Biochemical Plant Pathology, GSF-Forschungszentrum für Umwelt und Gesundheit, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
⁴Soil Ecology, Technische Universität München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
⁵Phytopathology of Woody Plants, Technische Universität München, Am Hochanger 13, 85354 Freising-Weihenstephan, Germany
⁶Forest Growth and Yield Science, Technische Universität München, Am Hochanger 13, 85354 Freising-Weihenstephan, Germany
⁷Soil Ecology, GSF - Forschungszentrum für Umwelt und Gesundheit, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
⁸Grassland Science, Technische Universität München, Am Hochanger 1, 80638 Freising-Weihenstephan, Germany
⁹Fruit Science/Fruit Tree Physiology, Technische Universität München, Alte Akademie 16, 85350 Freising-Weihenstephan, Germany

Abstract

Regulation of resource allocation in plants is the key to integrate understanding of metabolism and resource flux across the whole plant. The challenge is to understand trade-offs as plants balance allocation between different and conflicting demands, e.g., for staying competitive with neighbours and ensuring defence against parasites. Related hypothesis evaluation can, however, produce equivocal results. Overcoming deficits in understanding underlying mechanisms is achieved through integrated experimentation and modelling the various spatio-temporal scaling levels, from genetic control and cell metabolism towards resource flux at the stand level. An integrated, interdisciplinary research concept on herbaceous and woody plants and its outcome to date are used, while drawing attention to currently available knowledge. This assessment is based on resource allocation as driven through plant-pathogen and plant-mycorrhizosphere interaction, as well as competition with neighbouring plants in stands, conceiving such biotic interactions as a “unity” in the control of allocation. Biotic interaction may diminish or foster effects of abiotic stress on allocation, as changes in allocation do not necessarily result from metabolic re-adjustment but may obey allometric rules during ontogeny. Focus is required on host-pathogen interaction under variable resource supply and disturbance, including effects of competition and mycorrhization. Cost/benefit relationships in balancing resource investments versus gains turned out to be fundamental in quantifying competitiveness when related to the space, which is subject to competitive resource exploitation. A space-related view of defence as a form of prevention of decline in competitiveness may promote conversion of resource turnover across the different kinds of biotic interaction, given their capacity in jointly controlling whole plant resource allocation.

Key words

Growth - allocation - allometry - competition - parasites - pathogens - fungi - mycorrhizae - mycorrhizosphere - soil micro-organisms - molecular mechanisms - modelling - trade-offs - trees - herbs

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R. Matyssek

Ecophysiology of Plants
Technische Universität München

Am Hochanger 13

85354 Freising-Weihenstephan

Germany

eMail: matyssek@wzw.tum.de

Editor: H. Rennenberg