REGULATION OF ROOT HAIR TIP GROWTH: CAN MITOGEN-ACTIVATED PROTEIN KINASES BE TAKEN INTO ACCOUNT?

摘要

Plant growth and development are complex processes modulated by multi-level regulation mechanisms that depend on both internal and external signals. Such signals with the capacity to alter the morphogenesis of plant cells are perceived at the cellular level. Based on mitogen-activated protein kinase (MAPK) cascades, signalling of diverse stress-related factors is responsible for the generation of cell- and tissue-specific responses, and can be expected to participate also in the signal-mediated growth of plant cells, like tip growth of root hairs. Investigating stress-induced MAPKs in growing root hairs revealed a new field of complexity in plant signalling networks, and thus, MAPKs supplemented the collection of tip growth-specific factors with putative regulatory functions. The emerging scenario appears to be more complex; MAPK signalling pathways can support the reorganization of root epidermal cells during formation of tip growing hairs, but can also participate in the harmony of root hair tip growth with the changing environment.