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Biochemical characterization of tomato plants infected with fungal pathogens
Oušková, Marie ; Hýsková, Veronika (advisor) ; Kubíčková, Božena (referee)
Fungal pathogens including Verticillium longisporum which causes verticillium wilt are among the serious diseases of crops that easily spread worldwide. One of the ways to prevent fungal infection is to use fungal biocontrol agents applied as a seed coating. This control agent, the non-pathogenic oomycete Pythium oligandrum, enters the soil together with the seed and acts symbiotically in the plant's root system. On the one hand, it stimulates the plant's defence mechanism by secreting elicitors, and on the other hand, by providing tryptamine, it stimulates growth and increases the plant's fitness with auxin. In this work we studied the effect of seed treatment of Solanum lycopersicum L. cv. Micro-Tom with three different isolates of the genus Pythium (including the commercially used isolate M1 and two yet unused isolates X42 and X48) on the activities of antioxidant and NADP(H)-dependent enzymes in the leaves of plants infected with fungal pathogen V. longisporum. Two weeks after pathogen inoculation, no significant difference was found in the studied enzymes except for increased glucose-6phosphate dehydrogenase and NADP-malate dehydrogenase (oxaloacetate decarboxylation) activity in plants treated with X42 isolate and increased shikimate dehydrogenase activity and antioxidant capacity in plants...
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Biological control of plant pathogens
Chudý, Michal ; Ryšlavá, Helena (advisor) ; Müller, Karel (referee)
Heat shock proteins (HSPs) play a major role in protecting cellular proteins, acting as chaperones, preventing aggregation of partially damaged molecules, and help the protein repack, repair and create its right three-dimensional structure. Their synthesis occurs mainly during the stress state of the cell or the whole plant. Biotic forms of stress induce the expression of pathogenesis-related proteins (PRs), which are often characterized by enzyme activity, such as glucanases, chitinases and peroxidases. In this work, the effect of infection with fungal pathogens Alternaria brassicicola and Verticillium longisporum on the content of HSP70, HSP90 and PR-1, PR-2, PR-3 was followed in the tomato plants (Solanum lycopersicum L. cv. Micro-Tom) and rapeseed plants (Brassica napus subsp. oleifera). The seeds were treated with isolates of oomycete Pythium oligandrum, which is one of the unique and commercially available biological control agents. HSPs and PRs proteins were detected immunochemically on a nitrocellulose membrane. Immunochemical analysis showed the interaction of primary antibodies against HSP70 and HSP90 with low relative molecular weight proteins. Infection with Alternaria brassicicola and Verticillium longisporum increased the representation of 33 kDa - 43 kDa proteins. Seed treatment with...
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