Relationship between quantum efficiency of PSII and cold-induced plant resistance to fungal pathogens |
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Authors: | Email author" target="_blank">Agnieszka?P?a ekEmail author Marcin?Rapacz Katarzyna?Hura |
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Institution: | (1) Department of Plant Physiology, Faculty of Agriculture and Economics, Agricultural University of Cracow, Podłu na 3, 30-239 Kraków, Poland;(2) Department of Plant Physiology, Faculty of Agriculture and Economics, Agricultural University of Cracow, Podłu na 3, 30-239 Kraków, Poland |
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Abstract: | The aim of the presented work was to study whether the efficiency of photosynthesis may influence resistance of hardened plants
to disease. Seedlings of spring barley, meadow fescue and winter oilseed rape were chilled at 5 °C for 2, 4 or 6 weeks and
at these deadlines the changes in cell membrane permeability (expressed as electrolyte leakage), chlorophyll fluorescence
(initial fluorescence - F0, maximal fluorescence - Fm, quantum yield of PSII - Fv/Fm) and net photosynthesis rate (FN) were measured. Also, the influence of cold on the degree of plant resistance to economically important pathogens -Bipolaris sorokiniana or Phoma lingam was estimated. Two, four or six week-hardened plants were artificially infected: barley and fescue by B. sorokiniana, and oilseed rape by P. lingam.
Hardening at 5 °C stimulated resistance of barley, fecue and rape to their specific pathogens. Six-week long acclimation was
the most effective for plant resistance. Cold significantly changed cell membrane permeability and decreased chlorophyll fluorescence
(F0, Fm and Fv/Fm) of all studied plant species, while net photosynthesis rate was found to decrease only in barley. The results indicate that
cold-induced resistance of plants to pathogens was correlated with a decrease in cell membrane permeability. In the case of
fescue and barley a significant connection between the quantum yield of PSII and their resistance to B. sorokiniana was shown. Additionally, the resistance of barley to fungus was depended on net photosynthesis rate. In general this research
shows that the efficiency of photosynthesis may be used as an indicator of plant resistance to disease. |
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Keywords: | Bipolaris sorokiniana Brassica napus var oleifera chlorophyll fluorescence cross-tolerance Festuca pratensis Hordeum vulgare net photosynthesis Phoma lingam |
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