Oecologia

, 145:21 | Cite as

Modulation of relative growth rate and its components by water stress in Mediterranean species with different growth forms

  • Jeroni Galmés
  • Josep Cifre
  • Hipólito Medrano
  • Jaume Flexas
Ecophysiology

Abstract

Effects of water availability on seedling growth were analysed in eight Mediterranean species naturally occurring in the Balearic Islands. Seedlings were grown outdoors during summer under two irrigation treatments: field capacity and 35% of field capacity. The relative growth rate (RGR) strongly depended on the growth form, from highest values in herbs to lowest in woody perennials. The main component associated with interspecific variation in RGR was the specific leaf area (SLA), and a quantitative grouping of the different growth forms appeared along the regression line between both parameters. The slow-growing species, i.e. woody perennial shrubs, had the lowest SLA and the fast-growing perennial herbs, the highest, while woody semi-deciduous shrubs appeared intermediate. Decreases in RGR due to water stress were analysed in terms of the relative contribution of the leaf mass ratio (LMR), SLA and the net assimilation rate (NAR). Pooling all species, the decrease in RGR caused by water deficit was mainly explained by decreases in SLA. However, this general pattern was strongly dependent of growth form. Thus, in the woody perennial plants, the decrease in RGR was accompanied by a three-fold decrease in NAR which, however, increased in perennial herbs. SLA increased with decreasing water supply in woody perennial plants, and decreased in woody semi-deciduous shrubs and perennial herbs. Finally, decreases in LMR partly explained decreases in RGR in perennial herbs and woody perennial shrubs. This different response of the different growth forms may reflect differences in seedling adaptation and surviving strategies to drought periods.

Keywords

Balearic endemics Drought Leaf area ratio Net assimilation rate Specific leaf area 

Notes

Acknowledgements

We wish to thank Drs. H. Lambers and J. Gulías for their helpful suggestions to improve various versions of the manuscript. Dr. M. Mus is acknowledged for his botanical advice. J. Galmés was supported by a Beca de Formació de Professorat Universitari (Universitat de les Illes Balears). This work is part of Project REN2001-3506-CO2-O2, Spain.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Jeroni Galmés
    • 1
  • Josep Cifre
    • 1
  • Hipólito Medrano
    • 1
  • Jaume Flexas
    • 1
  1. 1.Grup de Recerca en Biologia de les Plantes en Condicions MediterràniesUniversitat de les Illes BalearsPalma de MallorcaSpain

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