Protective role of <Emphasis Type="Italic">S</Emphasis>-methylmethionine-salicylate in maize plants infected with <Emphasis Type="Italic">Maize dwarf mosaic virus</Emphasis> |
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| Authors: | Edit Ludmerszki Sengnirane Chounramany Csilla Oláh György Kátay Ilona Rácz Asztéria Almási Ádám Solti Iván Bélai Szabolcs Rudnóy |
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| Institution: | 1.Department of Plant Physiology and Molecular Plant Biology,E?tv?s Loránd University,Budapest,Hungary;2.Plant Protection Institute, Centre for Agricultural Research,Hungarian Academy of Sciences,Budapest,Hungary |
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| Abstract: | This study aimed to detect the harmful effects of Maize dwarf mosaic virus (MDMV) infection, and to demonstrate the potential benefits of S-methylmethionine-salicylate (MMS) pretreatment in infected maize (Zea mays L.) plants. The results of chlorophyll a fluorescence measurements showed that in MDMV-infected plants additional quenchers of fluorescence appear, probably as the result of associations between the virus coat protein and thylakoid membranes. It is important to note that when infected plants were pretreated with MMS, such associations were not formed. MDMV infection and MMS pretreatment resulted in a decrease in ascorbate peroxidase (APX) activity in maize leaves, while infection contributed to an increase in activity in the roots. Infection raised the guaiacol peroxidase (GPX) enzyme activity level, which was reduced by MMS pretreatment. MMS contributed to a decrease in both the RNA and coat protein content of MDMV, to an equal extent in maize leaves and roots. The results showed that MMS pretreatment enhanced the stress response reactions against MDMV infection in maize plants and retarded the spreading of infection. |
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