如何提高土壤磷素可利用性，实现化学磷肥零增长，同时减少环境中过量的磷，降低磷素流失污染风险已成为资源与环境领域研究的热点。了解在低磷和高磷环境中均能生长良好的植物特性，研究其高效吸收磷素的机理具有一定的现实意义。因此，基于磷素资源利用与磷素环境效应的双重性，本项目以磷富集植物矿山生态型水蓼为研究对象，拟从根系磷转运子、根系发育特征、根系激素变化及其相互作用关系展开研究，探讨不同磷浓度下水蓼根系PHT1家族磷转运子的表达特性、根系发育调控、及两者与磷高效吸收的关系；研究根系激素对外界供磷水平的响应，分析根系PHT1家族磷转运子和根系发育与根系内源激素的关系；研究外源目标激素调控水蓼磷吸收的机理，以期阐明低磷和高磷环境下，磷富集矿山生态型水蓼高效吸收磷的根系分子生理机理，为定向培育磷高效吸收植物以适应不同土壤肥力条件及栽培目的提供依据。

It has become a research hot spot that how to increase the availability of soil phosphorus to realize zero application of chemical phosphorus fertilizers, as well as that how to decrease excessive phosphorus in the environment to reduce the risk of phosphorus loss and pollution. It shows great significance to understand the plant characteristics that can grow well in both low and high phosphorus environments and to study the mechanisms of their efficient phosphorus uptake. In the background of the dualism of phosphorus in resource utilization and environmental effects, several pot experiments will be conducted in different P treatments using the mining ecotypes of Polygonum hydropiper to investigate 1) the characteristics of root phosphate transporters in PHT1 family, root development and root transcriptome; 2) the relationships of root phosphate transporters in PHT1 family, root development and plant phosphorus uptake; 3) the response of endogenous phytohormones in roots to different P levels; 4) the relationships between expression characteristics of root phosphate transporters in PHT1 family, root development, and the endogenous phytohormones in roots; 5) the mechanisms for regulation on phosphorus uptake of P. hydropiper by exogenous phytohormones through analysis of expression characteristics of root phosphorus transporters in PHT1 family and root development. This project would provide the basis for the targeted cultivation of phosphorus efficient uptake plants to adapt to different soil fertility conditions and cultivation purposes.