Nitrogen nutrition during ontogeny of hemiepiphytic Clusia species

Functional Plant Biology : FPB
Wolfgang WanekMarianne Popp

Abstract

This paper originates from a presentation at the IIIrd International Congress on Crassulacean Acid Metabolism, Cape Tribulation, Queensland, Australia, August 2001. We investigated the nitrogen (N) nutrition of Clusia osaensis, C. peninsulae and C. valerii during the seedling, epiphytic and hemiepiphytic phase in a lowland tropical forest in Costa Rica in order to elucidate nutritional adaptations of different plant growth stages to their habitat. Although all Clusia individuals were non-mycorrhizal, excised roots of seedlings, but also of epiphytic and hemiepiphytic stages, showed a distinct preference for glycine uptake. The shift in main rooting site from canopy soil to terrestrial soil was not reflected by changes in uptake rate or preference, although N availability and the composition of the available N pool changed significantly. High foliar N concentrations indicated that epiphytic seedlings seemed to be sufficiently supplied with N by maternal seed resources and canopy soils. With development, the epiphytic plants of Clusia may face N limitation due to higher N demands with increasing growth and restricted resources in the tree crowns. 15N natural abundance data indicate that epiphytes mainly accessed atmospheric and, ...Continue Reading

Citations

Sep 24, 2004·Rapid Communications in Mass Spectrometry : RCM·Gerhard Hertenberger, Wolfgang Wanek
May 1, 2006·Functional Plant Biology : FPB·Amy E ZanneColin M Orians
Feb 1, 2008·Functional Plant Biology : FPB·Wolfgang Wanek, Katja Pörtl
May 1, 2006·Functional Plant Biology : FPB·Susanne Schmidt, Dieter P Tracey

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