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Flooding tolerance: a reinterpretation of Crawford's metabolic theory

Published online by Cambridge University Press:  05 December 2011

C. A. Joly
C. A. Joly
Affiliation:
Department of Botany – IB, State University of Campinas/UNICAMP, C.P. 6109 Campinas 13081–970, Brazil
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Synopsis

The flooding tolerance strategy of three tropical gallery forest species, Sebastiana klotzchyana, Hymenaea courbaril var. stilbocarpa and Chorisia speciosa was studied. Data from the flood-intolerant Schyzolobium parahyba have been included for comparison.

In the case of S. klotzchyana flooding induced an acceleration of glycolysis, with ethanol as the sole end product of anaerobic metabolism. Oxygen diffusion to the root system was not detectable.

The results obtained for H. courbaril and C. speciosa show a compromise between metabolic and morpho-anatomical adaptations to enable them to occupy seasonally flooded areas. In both species, at the onset of the stress, the roots stop producing high amounts of ethanol and lactate. diverting part of the pyruvate produced to malate. The amount of pyruvate converted into malate is determined by the amount of oxygen diffused from the aerial part to the roots. This is used to oxidise pyruvate through Krebs' cycle and the excess is converted to malate. ATP production in the root system is predominantly aerobic and therefore not linked to malate production.

The low level of acceleration of the fermentative pathway, coupled with the lack of oxygen diffusion to the root system, resulted in a significant decrease in the growth rate of S. parahyba.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 102: Oxygen and Environmental Stress in Plants , 1994 , pp. 343 - 354
Copyright
Copyright © Royal Society of Edinburgh 1994

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