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Caractérisation des cellules bordantes et du mucilage chez la pomme de terre (Solanum tuberosum) : rôle dans la défense racinaire ?

Abstract : The potato (Solanum tuberosum) is the main non-cereal foodstuff and was declared a food of the future in 2008 by FAO. Today, world potato production has reached 374 million tonnes (FAO). However the potato is susceptible to many root diseases such as blackleg disease caused by Erwinia carotovora subsp. atroseptica (Latour et al., 2008). To date, there is no effective chemical or biological treatment for controlling these soil-borne pathogens. Thus, a better understanding of the physiological, cellular and molecular mechanisms involved in the interactions needed to propose new defense strategies against these pathogens. However, the immune response at the root level remains very little studied. Root cells (BC) and root exudates have been shown to play a key role in root defense. BCs are cells that derive from the root cap and are released into the rhizosphere at the soil / microorganism interface suggesting a role in root defense. The aim of this thesis is to characterize the root system of the potato by focusing on BC and root exudates. We have for the first time characterized BC potatoes. The latter are presented as classical BCs detached individually from the root (Cannesan et al., 2012). We have also shown that potato BCs are able to perceive an elicitor and develop a specific immune response. In addition potato BCs are coated in a large mucilage whose polysaccharide composition has been determined. We have shown that these exudates are rich in protein glycoproteins arabinogalactan proteins (AGP) and extensins. Following these results, we initiated a functional analysis of root exudates of potato on the development of the bacterium Pectobacterium atrosepticum, as well as a bioinformatic analysis of all the HRGPs (Hyprodroxyprolines-rich glycoproteins) of the potato. . This last objective requires the implementation of a bioinformatic tool based on the use of R (R Development Core Team) software.
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Abdoul Salam Koroney. Caractérisation des cellules bordantes et du mucilage chez la pomme de terre (Solanum tuberosum) : rôle dans la défense racinaire ?. Biologie végétale. Université de Rouen; Université de Niamey, 2015. Français. ⟨tel-02053677⟩



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