a College of Resources , Sichuan Agricultural University , Chengdu , Sichuan , China.
Int J Phytoremediation. 2018 May 12;20(6):608-615. doi: 10.1080/15226514.2017.1413327.
Understanding plant phosphorus (P) assimilation and its root morphological responses is important to acquire an ideal material for remediation of P-enriched environments. Pot experiments were conducted to explore P accumulation and root morphological traits in a mining ecotype (ME) and non-mining ecotype (NME) of Polygonum hydropiper under different organic P (Po) sources (G1P, AMP, ATP, IHP) and inorganic P (Pi) source (KHPO), and also their responses to a high level of IHP for different growth periods. Both ecotypes showed higher biomass in Pi and IHP treatments than other Po sources. P accumulation in seedlings were in the order of Pi > IHP > other Po media. Extending the growth period increased biomass and P accumulation in both ecotypes. The ME demonstrated 1.11-1.46 times higher P accumulation than the NME. Seedlings fed with IHP demonstrated significantly greater morphological parameters of fine, medium, and thick roots compared to other Po sources. Total root length, surface area, and volume of both ecotypes significantly increased with the prolonged growth period. The ME has a higher ability to develop root system and exhibits better distribution of fine roots to enhance P accumulation from high P media, and thus it is a worthy material for P-phytoextraction.
了解植物磷（P）吸收及其根系形态响应对于获得理想的材料来修复富磷环境非常重要。通过盆栽实验，研究了在不同有机磷（Po）源（G1P、AMP、ATP、IHP）和无机磷（Pi）源（KH2PO4）下，以及在不同生长时期高浓度 IHP 处理下，磷矿生态型（ME）和非磷矿生态型（NME）石龙芮对磷的积累和根系形态特征的响应。两种生态型在 Pi 和 IHP 处理下的生物量均高于其他 Po 源。幼苗对 Pi 和 IHP 的磷积累量均高于其他 Po 源。延长生长周期会增加两种生态型的生物量和磷积累。ME 比 NME 积累的磷多 1.11-1.46 倍。与其他 Po 源相比，IHP 处理的幼苗细根、中根和粗根的形态参数显著更大。两种生态型的总根长、表面积和体积均随生长周期的延长而显著增加。ME 具有更高的根系发育能力，表现出更好的细根分布，从而能够从高磷介质中积累更多的磷，因此它是一种很有价值的 P 植物提取材料。
