Are Sunflower chlorotic mottle virus infection symptoms modulated by early increases in leaf sugar concentration?

Symptom development in a susceptible sunflower line inoculated with Sunflower chlorotic mottle virus (SuCMoV) was followed in the second pair of leaves at different post-inoculation times: before symptom expression (BS), at early (ES) and late (LS) symptom expression. Sugar and starch increases and...

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Bibliographic Details
Published in:	Journal of plant physiology Vol. 167; no. 14; pp. 1137 - 1144
Main Authors:	Rodríguez, Marianela, Taleisnik, Edith, Lenardon, Sergio, Lascano, Ramiro
Format:	Journal Article
Language:	English
Published:	Munich Elsevier GmbH 15.09.2010 Elsevier
Subjects:	antioxidant activity Antioxidants ascorbate peroxidase Ascorbate Peroxidases Biological and medical sciences Bromovirus Bromovirus - pathogenicity Carbohydrates Chloroplastic proteins Chloroplasts Chloroplasts - metabolism D1 protein enzyme activity Fructose Fructose - metabolism Fundamental and applied biological sciences. Psychology Glucose Glucose - metabolism Glutathione Reductase Glutathione Reductase - metabolism glutathione-disulfide reductase Helianthus Helianthus - metabolism Helianthus - virology Helianthus annuus Leaves metabolism Oxidative Stress Oxidative Stress - physiology pathogenicity Peroxidase Peroxidases Peroxidases - metabolism photoinhibition physiology Phytopathology. Animal pests. Plant and forest protection Plant Leaves Plant Leaves - metabolism Plant Leaves - virology Plant physiology and development Plant Proteins Plant Proteins - metabolism Plant viruses and viroids Reactive oxygen species Reactive Oxygen Species - metabolism Sod Starch Starch - metabolism Starches SuCMoV Sucrose Sucrose - metabolism Sugar Sugars Sunflowers superoxide dismutase Superoxide Dismutase - metabolism virology viruses SuCMoV Oxidative stress Reactive oxygen species DTT ΦPSII G LS APX BS S PPV XTT Sugar DGC NBT PVPP SDS Chloroplastic proteins DTNB SOD GR EDTA ES EGTA PEG TCA Fv/Fm CAT ROS Sor DPI Plant pathogen Increase Plant leaf Protein Virus Infection Symptomatology Plant physiology Potato virus Y Modulation Chemical concentration Carbohydrate Potyvirus Potyviridae Chloroplast
ISSN:	0176-1617, 1618-1328, 1618-1328
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Summary:	Symptom development in a susceptible sunflower line inoculated with Sunflower chlorotic mottle virus (SuCMoV) was followed in the second pair of leaves at different post-inoculation times: before symptom expression (BS), at early (ES) and late (LS) symptom expression. Sugar and starch increases and photoinhibition were observed as early effects BS, and were maintained or enhanced later on, however, chlorophyll loss was detected only at LS. Photoinhibition correlated with a drastic decrease in D1 protein level. The progress of infection was accompanied by decreasing levels of apoplastic reactive oxygen species (ROS). In infected leaves, higher antioxidant enzyme activities (superoxide dismutase, SOD; ascorbate peroxidase, APX; glutathione reductase, GR) were observed from BS. The purpose of this work was to evaluate whether the early increases in carbohydrate accumulation may participate in SuCMoV symptom expression. Similar effects on photoinhibition, apoplastic ROS generation and antioxidant activity were generated when healthy leaves were treated with sugars. These results suggest that photoinhibitory processes and lower apoplastic superoxide levels induced by SuCMoV infection may be modulated by sugar increases.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0176-1617 1618-1328 1618-1328
DOI:	10.1016/j.jplph.2010.03.004