Journal Article

Adaptative Response of <i>Vitis</i> Root to Anoxia

Stefano Mancuso and Anna Maria Marras

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 3, pages 401-409
Published in print March 2006 | ISSN: 0032-0781
Published online March 2006 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcj007
Adaptative Response of Vitis Root to Anoxia

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  • Biochemistry
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The effect of anoxia on the energy economy of root cells was studied by measuring heat production, ethanol and ATP production, K+ fluxes and electrical activity in two Vitis species, V. riparia and V. rupestris, that differ in their tolerance to anoxia. Anoxia triggered a marked decrease of metabolic activity (measured by microcalorimetry) and of ATP levels in both species. In V. riparia after the first 2 h of anoxia, the decrease in the rate of heat production was not associated with a further significant decrease in ATP content, whereas in V. rupestris the ATP level continued to decrease until very low values were reached. The concomitant increase in the rate of ethanol production did not compensate for the decreased aerobic ATP supply. In V. rupestris, anoxia typically led to energy deficit and ATP imbalance, together with the subsequent disruption of ion homeostasis and cell death. In V. riparia, the strong decrease in K+ membrane permeability together with the fast down-regulation of the electrical signals allowed the cells to avoid severe ion imbalances during prolonged anoxic episodes.

Keywords: Anoxia; Down-regulation; Electrical signals; Hochachka’s ‘hypoxia defense strategy’; Potassium flux (under anoxia); Vitis spp.; NS, Nutrient Solution; TZ, transition zone

Journal Article.  6238 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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