Pathogenic and non-pathogenic stress effects on peroxidases in leaves of tobacco
Identifieur interne : 004B22 ( Main/Exploration ); précédent : 004B21; suivant : 004B23Pathogenic and non-pathogenic stress effects on peroxidases in leaves of tobacco
Auteurs : Aglika M. Edreva [Bulgarie] ; Iordanka D. Georgieva [Bulgarie] ; Nelly I. Cholakova [Bulgarie]Source :
- Environmental and Experimental Botany [ 0098-8472 ] ; 1989.
English descriptors
- Teeft :
- Acidic, Carl zeiss, Cell walls, Chlorophyll, Chlorophyll loss, Cichoracearum, Corresponding controls, Cucumber mosaic virus, Cytochemical, Cytochemical approaches, Cytochemical test, Cytochemical tests, Cytochrome oxidase, Damage symptoms, Different letters, Different origin, Different sources, Different stress factors, Disc electrophoresis, Disease resistance, Edreva, Enzyme activity, Epidermal cells, Fungal hyphae, Fungi, Groupe polyphenols, Higher plants, Infection type, International enzyme units, Late damage stage, Late stage, Leaf tissues, Lipid, Lipid peroxidation, Lipid peroxide content, Lipid peroxide contents, Lipid peroxides, Malonyl dialdehyde, Manganese toxicity, Mesophyll, Mesophyll cells, Mild damage symptoms, Molecular heterogeneity, Necrosis formation, Necrotic, Necrotic areas, Nicotiana tabacum, Other details, Palisade parenchyma, Peronospora tabacina, Peroxidase, Peroxidase activity, Peroxidation, Peroxide, Physiol, Physiological aspects, Physiological roles, Plant peroxidases, Potato virus, Reaction mixture, Relative humidity, Senescence, Senescent, Severe damage symptoms, Slight increase, Stress conditions, Stress effects, Stress factors, Stress stimuli, Symptom, Symptom appearance, Systemic mosaic infection type, Tabacina, Tenuis, Tobacco mosaic virus, Tobacco plants, Tobacco seedlings, Total chlorophyll, Vascular bundle, Vascular bundles, Visible damage symptoms, Visible symptoms.
Abstract
Abstract: The effects of stress stimuli of different sources, including pathogenic (fungi, bacteria, viruses), non-pathogenic (excess of water and manganese, γ-irradiation), as well as senescence, were examined in tobacco leaves. Some of these stimuli produced damage symptoms that differed in severity, whereas others did not produce visible damage symptoms. The activity, molecular heterogeneity, and localization of peroxidases (PO; E.C.1.11.1.7) in tobacco leaf tissues as influenced by stress stimuli were studied, using both biochemical and cytochemical approaches. Chlorophyll and lipid peroxide contents were also determined as related to tissue and cell membrane damage. All stress stimuli and senescene triggered an increase in PO activity. In tobacco-fungi interactions, this increase was a plant response to infection and not a contribution of the hyphal PO per se. The PO increases under stress conditions that caused visible tissue damage symptoms were concomitant with chlorophyll loss. The severity of damage corresponded to the rate of PO increase and chlorophyll loss. Under all stress conditions, increases in PO were accompanied by increased lipid peroxidation, resulting in damage to cell membranes. Thus, the responses of PO in tobacco leaves to various stress situations were shown not to depend on the origin of stress stimuli, but on the presence and degree of damage, suggesting a possible involvement of endogenous cell wall elicitors.
Url:
DOI: 10.1016/0098-8472(89)90011-7
Affiliations:
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Le document en format XML
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<term>Chlorophyll loss</term>
<term>Cichoracearum</term>
<term>Corresponding controls</term>
<term>Cucumber mosaic virus</term>
<term>Cytochemical</term>
<term>Cytochemical approaches</term>
<term>Cytochemical test</term>
<term>Cytochemical tests</term>
<term>Cytochrome oxidase</term>
<term>Damage symptoms</term>
<term>Different letters</term>
<term>Different origin</term>
<term>Different sources</term>
<term>Different stress factors</term>
<term>Disc electrophoresis</term>
<term>Disease resistance</term>
<term>Edreva</term>
<term>Enzyme activity</term>
<term>Epidermal cells</term>
<term>Fungal hyphae</term>
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<term>International enzyme units</term>
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<term>Leaf tissues</term>
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<term>Lipid peroxide contents</term>
<term>Lipid peroxides</term>
<term>Malonyl dialdehyde</term>
<term>Manganese toxicity</term>
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<term>Molecular heterogeneity</term>
<term>Necrosis formation</term>
<term>Necrotic</term>
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<term>Nicotiana tabacum</term>
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<term>Palisade parenchyma</term>
<term>Peronospora tabacina</term>
<term>Peroxidase</term>
<term>Peroxidase activity</term>
<term>Peroxidation</term>
<term>Peroxide</term>
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<term>Physiological aspects</term>
<term>Physiological roles</term>
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<term>Slight increase</term>
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<term>Stress effects</term>
<term>Stress factors</term>
<term>Stress stimuli</term>
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<term>Symptom appearance</term>
<term>Systemic mosaic infection type</term>
<term>Tabacina</term>
<term>Tenuis</term>
<term>Tobacco mosaic virus</term>
<term>Tobacco plants</term>
<term>Tobacco seedlings</term>
<term>Total chlorophyll</term>
<term>Vascular bundle</term>
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<front><div type="abstract" xml:lang="en">Abstract: The effects of stress stimuli of different sources, including pathogenic (fungi, bacteria, viruses), non-pathogenic (excess of water and manganese, γ-irradiation), as well as senescence, were examined in tobacco leaves. Some of these stimuli produced damage symptoms that differed in severity, whereas others did not produce visible damage symptoms. The activity, molecular heterogeneity, and localization of peroxidases (PO; E.C.1.11.1.7) in tobacco leaf tissues as influenced by stress stimuli were studied, using both biochemical and cytochemical approaches. Chlorophyll and lipid peroxide contents were also determined as related to tissue and cell membrane damage. All stress stimuli and senescene triggered an increase in PO activity. In tobacco-fungi interactions, this increase was a plant response to infection and not a contribution of the hyphal PO per se. The PO increases under stress conditions that caused visible tissue damage symptoms were concomitant with chlorophyll loss. The severity of damage corresponded to the rate of PO increase and chlorophyll loss. Under all stress conditions, increases in PO were accompanied by increased lipid peroxidation, resulting in damage to cell membranes. Thus, the responses of PO in tobacco leaves to various stress situations were shown not to depend on the origin of stress stimuli, but on the presence and degree of damage, suggesting a possible involvement of endogenous cell wall elicitors.</div>
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