Exogenous superoxide dismutase may lose its antidotal ability on rice leaves

Exogenous superoxide dismutase may lose its antidotal ability on rice leaves Leaf diffusates of the resistant rice (Oryza sativa L.) cultivars suppressed spore germination of blast fungus (Magnaporthe grisea (Hebert) Barr). Bovine Cu-Zn superoxide dismutase (SOD) added to the diffusate abolished its toxicity. However, the enzyme added to the inoculum did not affect the toxicity of the diffusate. Even the second SOD portion added to the diffusate was ineffective. As well, the enzyme exposed to leaves could not protect the fungus from artificially-generated superoxide. Presumably, SOD contacting with leaves induced an efflux of compound(s) inhibiting both portions of the enzyme. Evidence was obtained suggesting that neither enzymatic protein nor zinc of coenzyme but copper might be the inducer. A comparison of rice leaves and callus culture together with the effects of exogenous salicylic acid suggests that this compound may be the inhibitor liberating from leaves. It is not excluded that rice plants are capable of inactivation of antioxidant enzymes of pathogens and that this ability favors disease resistance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Exogenous superoxide dismutase may lose its antidotal ability on rice leaves

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2013 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443713020027
Publisher site
See Article on Publisher Site

Abstract

Leaf diffusates of the resistant rice (Oryza sativa L.) cultivars suppressed spore germination of blast fungus (Magnaporthe grisea (Hebert) Barr). Bovine Cu-Zn superoxide dismutase (SOD) added to the diffusate abolished its toxicity. However, the enzyme added to the inoculum did not affect the toxicity of the diffusate. Even the second SOD portion added to the diffusate was ineffective. As well, the enzyme exposed to leaves could not protect the fungus from artificially-generated superoxide. Presumably, SOD contacting with leaves induced an efflux of compound(s) inhibiting both portions of the enzyme. Evidence was obtained suggesting that neither enzymatic protein nor zinc of coenzyme but copper might be the inducer. A comparison of rice leaves and callus culture together with the effects of exogenous salicylic acid suggests that this compound may be the inhibitor liberating from leaves. It is not excluded that rice plants are capable of inactivation of antioxidant enzymes of pathogens and that this ability favors disease resistance.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Feb 17, 2013

References

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