Antioxidant defense mechanisms of cereal aphids based on ascorbate and ascorbate peroxidase |
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Authors: | Iwona ?ukasik Sylwia Go?awska Agnieszka Wójcicka |
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Affiliation: | (1) INRA/Agrocampus/Universit? Rennes 1, UMR 1099, BiO3P Domaine de la Motte, BP 35327, 35653 Le Rheu, France; |
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Abstract: | Effects of plant o-dihydroxyphenols on ascorbate (ASA) content and ascorbate peroxidase (APOX) activity in the tissues of the grain aphid Sitobion avenae and the bird cherry-oat aphid Rhopalosiphum padi were studied. Among the aphid morphs, the highest ASA content and APOX activity were noted for larvae and the lowest for wingless apterae. When exposed to o-dihydroxyphenols, aphids of both species contained significantly lower concentrations of ASA and higher APOX activity than the controls. Among the studied compounds, caffeic acid had the strongest effect on ASA-based antioxidant responses in that caffeic acid caused a 5-fold decrease of ASA in aphid tissues. The influences of the plant o-dihydroxyphenols on antioxidant defense mechanisms within the cereal aphid species are discussed. |
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