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          Institute: MPI für Evolutionsbiologie     Collection: Tropical ecology     Display Documents

ID: 61120.0, MPI für Evolutionsbiologie / Tropical ecology
Internal oxygen transport in cuttings from flood-adapted várzea tree species
Authors:Haase, Karen; De Simone, Oliviero; Junk, Wolfgang J.; Schmidt, Wolfgang
Date of Publication (YYYY-MM-DD):2003-10
Title of Journal:Tree Physiology
Start Page:1069
End Page:1076
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Tree species from the Central Amazon inundation areas are subjected to extreme flooding, with trees being partially submerged for up to 10 months. The rapidly advancing floodwater table at the onset of the aquatic phase interrupts the inward diffusion of oxygen from the atmosphere to submerged plant parts. Salix martiana (Leyb.) (Salicaceae) and Tabemaemontana juruana ((Markgr.) Schumann ex J. F. Maebride) (Apocynaceae), tree species typical of Amazon floodplains, respond to low oxygen concentrations by forming adventitious roots capable of longitudinal oxygen transport. Cuttings of these tree species were subjected to simulated flooding and the oxygen concentration of the root cortex was temporally monitored by oxygen microelectrodes that penetrated the roots. Changes in the floodwater table made it possible to localize precisely the entry points of atmospheric oxygen. Under experimental conditions, mathematical description of the transport kinetics revealed that longitudinal transport Of 02 in both species was mainly attributable to diffusion. Based on the finding that diffusion was inhibited by a small increase in the floodwater table, we conclude that internal oxygen transport during a rising water table is only attainable when adventitious roots are continuously and rapidly developed, as is the case in S. martiana. In T. juruana, slow growth of adventitious roots and low root porosity suggest that other adaptations are required to overcome long flooding periods.
Free Keywords:aerenchyma; flooding; lenticels; radial oxygen loss; root porosity; suberization; varzea
External Publication Status:published
Document Type:Article
Communicated by:Pia Parolin
Affiliations:MPI für Limnologie/AG Tropenökologie
External Affiliations:University of Oldenburg, Department of Biology, P.O. Box 165, D-26111 Oldenburg, Germany; Humboldt University Berlin, Invalidenstraße 42, 10115 Berlin, Germany
Identifiers:ISSN:0829-318X [ID-No:1]
LOCALID:2241/S 38065 [Listen-Nummer/S-Nummer]
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