Institute of Grassland, Flowers and Ecology, Beijing Academy of Agriculture and Forestry Sciences (BAAFS), No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, China.
Institute of Grassland, Flowers and Ecology, Beijing Academy of Agriculture and Forestry Sciences (BAAFS), No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, China.
Ecotoxicol Environ Saf. 2024 Oct 15;285:117038. doi: 10.1016/j.ecoenv.2024.117038. Epub 2024 Sep 14.
The impact of microplastics (MPs) on plant growth, particularly root development, remains underexplored. To address this, a laboratory pot experiment and meta-analysis were conducted to assess how varying concentrations of MPs affect plant root growth. In pot experiments, the response of root traits to MPs differed by plant species. For F. arundinacea, a higher addition (1 % and 2 %) of polypropylene (PP) significantly increased the total length, surface area, volume, as well as fine root (<1 mm) surface area and volume. Partial least squares path modeling (PLS-PM) analysis showed that high concentrations of MPs affected plant root growth and plant root biomass by promoting fine root growth. Meta-analysis indicated that MPs increased shoot dry biomass by 32.7 % but reduced root dry biomass by 4.1 % and root length by 14.3 %. Higher concentrations (>0.5 %) of MPs significantly increased root length (35.2 %) and root dry biomass (6.3 %), whereas decreased shoot dry biomass (-8.6 %). Under the lower MPs concentration (<0.5 %), the root length and root dry biomass were decreased by 18.6 % and 11.1 %, respectively, and the shoot dry biomass was increased by 53.2 % compared with the treatment without MPs. The results emphasize the differences in performance between species for different MPs concentrations, implying that there may be future scope to select for species/varieties that are most resilient to the presence of MPs.
微塑料（MPs）对植物生长，特别是根系发育的影响尚未得到充分探索。为了解决这个问题，进行了实验室盆栽实验和荟萃分析，以评估不同浓度的 MPs 如何影响植物根系生长。在盆栽实验中，根系特征对 MPs 的响应因植物物种而异。对于荻，较高浓度（1%和 2%）的聚丙烯（PP）显著增加了总长度、表面积、体积，以及细根（<1mm）的表面积和体积。偏最小二乘路径模型（PLS-PM）分析表明，高浓度的 MPs 通过促进细根生长来影响植物根系生长和植物根系生物量。荟萃分析表明， MPs 增加了地上部干生物量 32.7%，但减少了根系干生物量 4.1%和根长 14.3%。较高浓度（>0.5%）的 MPs 显著增加了根长（35.2%）和根系干生物量（6.3%），而减少了地上部干生物量（-8.6%）。在较低 MPs 浓度（<0.5%）下，根长和根干生物量分别减少了 18.6%和 11.1%，而与无 MPs 处理相比，地上部干生物量增加了 53.2%。这些结果强调了不同 MPs 浓度下不同物种之间表现的差异，这意味着可能有未来的空间来选择对 MPs 存在最具弹性的物种/品种。
