Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan.
Annu Rev Plant Biol. 2011;62:185-206. doi: 10.1146/annurev-arplant-042110-103849.
Plants acquire phosphorus in the form of phosphate (Pi), the concentration of which is often limited for plant uptake. Plants have developed diverse responses to conserve and remobilize internal Pi and to enhance Pi acquisition to secure them against Pi deficiency. These responses are achieved by the coordination of an elaborate signaling network comprising local and systemic machineries. Recent advances have revealed several important components involved in this network. Pi functions as a signal to report its own availability. miR399 and sugars act as systemic signals to regulate responses occurring in roots. Hormones also play crucial roles in modulating gene expression and in altering root system architecture. Transcription factors function as a hub to perceive the signals and to elicit steady outputs. In this review, we outline the current knowledge on this subject and present hypotheses pertaining to other potential signals and to the organization and coordination of signaling.
植物以磷酸盐（Pi）的形式获取磷，其浓度通常限制了植物的吸收。植物已经发展出多种响应来保护和再利用内部的 Pi，并增强 Pi 的获取，以防止它们缺乏 Pi。这些响应是通过一个包含局部和系统机制的精细信号网络的协调来实现的。最近的进展揭示了这个网络中的几个重要组成部分。Pi 作为一种信号，报告其自身的可用性。miR399 和糖作为系统信号，调节根系中发生的响应。激素也在调节基因表达和改变根系结构方面发挥着至关重要的作用。转录因子作为一个枢纽，感知信号并产生稳定的输出。在这篇综述中，我们概述了这方面的现有知识，并提出了关于其他潜在信号以及信号的组织和协调的假设。
