Abstract text: Cell-cell adhesion is a key determinant of tissue integrity in plants, traditionally considered to be mediated by the middle lamella. Using confocal imaging and Atomic Force microscopy, we found that exogenous sugar treatments induce micro adhesion defects at the epidermal surface and a significant widening of Arabidopsis dark-grown hypocotyls. Adhesion-defective mutants display even more severe adhesion defects and a clear reduction in hypocotyl length when grown in presence of sucrose. This micro adhesion phenotype is not sucrose specific, as glucose and fructose trigger similar defects. Tensile test performed with an extensometer further reveal significantly higher rigidity and breaking strength in hypocotyls grown with 1% sucrose compared to those grown without sugar. These results indicate that while sucrose appears to have a minimal impact on the local rigidity of the outer cell wall, it has a significant impact on the overall tensile mechanics of the hypocotyl. Interestingly, this phenotype resembles that observed in brassinosteroids (BR) biosynthesis or signaling impaired mutants, suggesting a potential interaction between sugar responses and BR signaling. In perspectives, to address that we combine BR signaling fluorescent reporter lines, BR signaling mutants, and chemical treatments to determine whether BR signaling disrupts or restores adhesion in sugar treated tissues.