Formation of a subero-lignified apical deposit in root tip of radish (Raphanus sativus) as a response to copper stress

摘要

Background and Aims Heavy metals induce changes in root metabolism and physiology, which can lead to a complex remodelling of the root system. The final morphological responses of radish (Raphanus sativus) roots exposed to toxic concentrations of the heavy metal (Cu) include root growth inhibition, differentiation of xylem vessels close to the root tip, enhanced suberin lamellae deposition and enhanced lateral root production. Recently, we have found that such changes in root morphology and anatomy are coupled to the formation of a suberolignified apical deposit (SLAD) very close to the root tip.