translate English to French: No other indication of a wall modification was seen for 3 weeks, at which time the root had become determinate and aerenchyma was beginning to form in the midcortex.
Aucune autre indication de modification pariétale ne peut être observée pendant 3 semaines, moment à lequel la racine est devenue déterminée et que les aérenchymes commencent à se former dans le cortex médian.