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2011 | 33 | 2 |
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Microdochium nivale (Fr., Samuels and Hallett): cytological analysis of the infection process in triticale (x Triticosecale Wittm.)

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According to regular reports, one of the most serious diseases of winter cereal and grass varieties in moderate and cold climatic areas is pink snow mould caused by Microdochium nivale. Currently, the resistance of the economically important cereal species as triticale is not satisfactory. Moreover, there is no efficient strategy of protection against this pathogen and the understanding of plant resistance mechanisms is rather poor. Presented paper for the first time shows the cytological analysis of M. nivale infection in model triticale varieties by the use of fluorescent and light microscopy in combination with fluorescent dyes and hydrogen peroxide staining. Both, the infection level and the dynamic of the process varied for tested genotypes confirming the field and laboratory data of their different resistance to this pathogen. Moreover, our analysis showed that in both cultivars cold-hardening of seedlings delayed the mycelium growth. In both cultivars, hyphal walls and fungal penetration sites were visualized in crowns, leaf sheaths and leaves of hardened and nonhardened inoculated seedlings. For the first time the presence of the haustoria produced by M. nivale was confirmed in those tissues. Single infection hyphae usually penetrated into the host tissues via stomatal apparatuses were accompanied by the efflux of hydrogen peroxide. The data show a great potential of fluorescence techniques in studying the host plant–pathogen interactions providing a better insight into plant defence reactions that may allow elaboration of the efficient breeding strategies aimed at increasing resistance to this pathogenic fungus.
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  • Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow, Poland
  • Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow, Poland
  • Institute of Biology, Pedagogical University of Krakow, Podbrzezie 3, 31-054 Krakow, Poland
  • Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow, Poland
  • Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Krakow, Poland
  • Institute of Biology, Pedagogical University of Krakow, Podbrzezie 3, 31-054 Krakow, Poland
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