Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59813
Type: Artigo de periódico
Title: PHYSIOLOGICAL AND ANATOMICAL ADAPTATIONS BY YOUNG ASTROCARYUM-JAUARI MART (ARECACEAE) IN PERIODICALLY INUNDATED BIOTOPES OF CENTRAL AMAZONIA
Author: SCHLUTER, UB
FURCH, B
JOLY, CA
Abstract: Young plants of the palm, Astrocaryum jauari, are well-adapted anatomically and physiologically to hypoxic conditions. Annual inundation for as long as 300 days, at water temperatures of 28-degrees-C, produce neither leaf loss nor rotting of the roots. At a depth of 1.2 m beneath blackwaters, the leaves in the crowns of the plants show little decrease in the amount of chlorophyll. In contrast, submersion to an equal depth in whitewater produces a loss of chlorophyll. Photosynthetic oxygen production decreases to less than 30 percent of the terrestrial rate in plants submerged beneath blackwater, and to less than 10 percent in plants submerged in whitewater. Ethanol production compensates for temporary energy deficits. Respiration by the roots is greatly reduced but does not cease during inundation. Well-developed aerenchyma permits gas transport from the branches to the roots. A cylinder of stone cells and sclerenchyma fibers in the outer periphery of the primary bark prevents the collapse of the root aerenchyma due to reduced pressure within the roots and increasing external pressure as water depth rises.
Subject: AMAZONIA
ASTROCARYUM
ETHANOL
FLOOD PLAINS
HYPOXIA
INUNDATION
MALATE
Editor: Assn Trop Biol
Rights: fechado
Identifier DOI: 10.2307/2388862
Date Issue: 1993
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.