Résumé
Proper gene expression is needed for plants development and environmental response. However, an observation is still not understood: multiple phenotypes can derive from one genome in one environment. This unexpected variability has been overlooked for a long time. Phenotypic and transcriptional variability are not the same as plasticity or genetic variation as it is observed without environmental and genetic differences. There are evidences this variability could be at least partly genetically controlled and biologically relevant. However, we still lack information about the mechanisms regulating plant-to-plant variability.