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 toxic...

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Bibliographic Details
Published in:Russian journal of plant physiology 2013-03, Vol.60 (2), p.270-278
Main Authors: Aver’yanov, A. A, Zakharenkova, T. S, Lapikova, V. P, Pasechnik, T. D, Gaivoronskaya, L. M, Baker, C. J
Format: Article
Language:English
Subjects:
Antioxidants
Biomedical and Life Sciences
callus culture
copper
disease resistance
fungi
inoculum
leaves
Life Sciences
Magnaporthe grisea
Oryza sativa
pathogens
Plant Physiology
Plant Sciences
Research Papers
rice
salicylic acid
spore germination
superoxide dismutase
toxicity
zinc
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Summary: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.
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443713020027