Anoxic Responses of Seedling Roots of Rice Cultivars Varying in Tolerance to Submergence

Anoxic Responses of Seedling Roots of Rice Cultivars Varying in Tolerance to Submergence Differences in tolerance to submergence and anoxia exhibited by cultivar-specific rice (Oryza sativa L.) extend to the primary root tips and axes of 3-day-old seedlings. This paper considers the physiological mechanisms which might account for rice root intolerance to anoxia, particularly those implicated in pH regulation and sugar metabolism in relation to hypoxic acclimation. Hypoxic treatment and the presence of glucose during anoxia did not permit root tips and axes of intolerant cultivars to survive 24-h anoxia. The absence of typical glycolytic and fermentative enzyme induction together with no improvement of ethanol production and energy status during anoxia suggest that intolerant cultivars are not capable of hypoxic acclimation at the level of energy and sugar metabolism. However, root tip survival was enhanced in buffered medium after hypoxic treatment, suggesting a relationship between hypoxic treatment and improved pH regulation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Anoxic Responses of Seedling Roots of Rice Cultivars Varying in Tolerance to Submergence

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/B:RUPP.0000003278.24454.a0
Publisher site
See Article on Publisher Site

Abstract

Differences in tolerance to submergence and anoxia exhibited by cultivar-specific rice (Oryza sativa L.) extend to the primary root tips and axes of 3-day-old seedlings. This paper considers the physiological mechanisms which might account for rice root intolerance to anoxia, particularly those implicated in pH regulation and sugar metabolism in relation to hypoxic acclimation. Hypoxic treatment and the presence of glucose during anoxia did not permit root tips and axes of intolerant cultivars to survive 24-h anoxia. The absence of typical glycolytic and fermentative enzyme induction together with no improvement of ethanol production and energy status during anoxia suggest that intolerant cultivars are not capable of hypoxic acclimation at the level of energy and sugar metabolism. However, root tip survival was enhanced in buffered medium after hypoxic treatment, suggesting a relationship between hypoxic treatment and improved pH regulation.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 17, 2004

References

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