Role of plasmodesmata regulation in plant development
Résumé
The cytoplasms of neighboring plant cells are linked by channels spanning the cell walls called plasmodesmata (PD). Extensive communication occurs through these channels that can allow the passage of solutes and macromolecules in a highly regulated fashion. The permeability of plasmodesmata has been shown to be regulated during plant development by many physiological and stress conditions and a growing number of endogenous macromolecules have been shown to regulate PD permeability. This regulation seems plays a role in inter-organ communication at the whole plant level. Moreover, plant can be divided into symplasmic fields or symplasmic domains, which are groups of cells interconnected by functional plasmodesmata. Symplasmic domains are completely isolated from surrounding tissues whereas symplasmic fields retain a certain level of communication with surrounding tissues. This organization is thought to ensure the coordination of development by allowing diffusion of signal molecules like transcription factors within the cells of a symplasmic field or domain.