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<dc:title xml:lang="fr">Etude du rôle des inhibiteurs de kinases-cycline-dépendantes (CKI) de la classe des SIM/SMR en réponse au stress abiotique chez Arabidopsis thaliana</dc:title>
<dcterms:alternative xml:lang="en">Study of the role of cyclin-dependant kinase inhibitor (CKI) of the class of SIM/SMR in response to abiotic stress in Arabidopsis thaliana</dcterms:alternative>
<dc:subject xml:lang="fr">Arabidopsis</dc:subject>
<dc:subject xml:lang="fr">Endoréplication</dc:subject>
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<dc:subject xml:lang="fr">Endoréduplication</dc:subject>
<dc:subject xml:lang="fr">SIM/SMR</dc:subject>
<dc:subject xml:lang="fr">UPS</dc:subject>
<dc:subject xml:lang="fr">Cycle cellulaire</dc:subject>
<dc:subject xml:lang="fr">Stress hydrique</dc:subject>
<dc:subject xml:lang="en">Arabidopsis</dc:subject>
<dc:subject xml:lang="en">Endoreplication</dc:subject>
<dc:subject xml:lang="en">CKI</dc:subject>
<dc:subject xml:lang="en">Endoreduplication</dc:subject>
<dc:subject xml:lang="en">SIM/SMR</dc:subject>
<dc:subject xml:lang="en">UPS</dc:subject>
<dc:subject xml:lang="en">Cell Cycle</dc:subject>
<dc:subject xml:lang="en">Drought Stress</dc:subject>
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<tef:elementdEntree autoriteExterne="056608675" autoriteSource="Sudoc">Plantes -- Expression génique</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="033240744" autoriteSource="Sudoc">Cycle cellulaire végétal</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029540038" autoriteSource="Sudoc">Protéines kinases</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Chez Arabidopsis thaliana, les protéines SIAMESE-RELATED (SIM/SMR1 à 13) forment une famille plante-spécifique d’Inhibiteurs de Kinase Cycline-dépendante (CKI), homologue des Kip-Related Proteins. SIM et SMR1 sont des régulateurs positifs de la transition du cycle mitotique vers l’endoréplication. L’expression des gènes SIM/SMR est induite en réponse àdes stress. L’un des stress abiotiques majeurs pour les plantes est la sécheresse. Les SIM/SMR pourraient être dégradées par la voie de la protéolyse spécifique de l’Ubiquitin Proteasome System (UPS). Les SIM/SMR sont de bons candidats pour relier l'activité du cycle cellulaire aux stimuli de l'environnement. Ce travail a démontré l’implication de la protéolyse UPS dans le contrôle posttraductionnel de tous membres SIM/SMR testés. Il démontre que SIM, SMR2 et SMR1 sont nécessaires à l’endoréplication des cellules foliaires. Lors d’un stress hydrique, l’expression des gènes SIM, SMR1, SMR3 et SMR5 est induite. Le profil spatio-temporel de ces inductions a mis en évidence deux groupes de gènes avec des fonctions distinctes. Les mutants sim, smr5 et sim.smr1.smr2 sont hypersensibles au stress hydrique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In Arabidopsis thaliana, the SIAMESE-RELATED proteins (SIM/SMR1 to 13) are a plantspecific family of Cyclin-dependent Kinase Inhibitors (CKIs), homologous to the Kip-Related Proteins. SIM and SMR1 are positive regulators of the switch from mitotic cycle to endoreplication. The expression of SIM/SMRs genes is induced in response to stress. One of the major abiotic stress for plants is the drought stress. The SIM/SMRs could be degraded through the specific proteolysis of Ubiquitin Proteasome System (UPS). The SIM/SMRs proteins are good candidates to link cell cycle activity with environmental stimuli.This research work has shown the involvement of the UPS proteolysis in the posttranslational control of all the tested members of the SIM/SMR family. It also shows that SIM, SMR2 and mostly SMR1 are required in endoreplication of leaf cells. During drought stress, the expression of SIM, SMR1, SMR3 and SMR5 genes is induced. The spaciotemporal pattern of those inductions revealed two groups of genes with distinct functions. In addition, the sim, smr5 and sim.smr1.smr2 loss-of-function mutants tested are hypersensitive to drought stress.</dcterms:abstract>
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