A novel evaluation of the effect of lanthanum exposure on plant populations,Chemosphere

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A novel evaluation of the effect of lanthanum exposure on plant populations
Chemosphere ( IF 8.1 ) Pub Date : 2018-03-13 , DOI: 10.1016/j.chemosphere.2018.03.086
Fan Zhang ₁ , Yihang Li ₁ , Yu Shi ₁ , Lihong Wang ₁ , Qing Zhou ₂ , Xiaohua Huang ₃

Affiliation

The accumulation of rare earth elements (REEs) in the environment has recently become a new environmental problem. There have been many studies about the effects of REEs on plant at the individual, organ, cellular and genetic levels. Plants exist in populations under natural conditions, but little is known about the effects of REEs on plant populations. In this study, the effects of lanthanum (III) [La(III)] on the root module growth of soybean (Glycine max L) populations at different densities were investigated by simulating La(III) pollution. Results showed that at La(III) concentrations of 0.40 and 1.20 mM, both the root module growth parameters and leaf photosynthesis parameters were decreased, with 1.20 mM of La(III) causing a more significant decrease. In addition, the above parameters in low-density soybean populations decreased more significantly than those in high-density soybean populations. The above results show that the inhibitory effects of 0.40 and 1.20 mM of La(III) on the growth of root modules are closely related to the inhibition of photosynthesis in soybean population. Moreover, the inhibitory effect of La(III) on the growth of root modules of soybean population is enhanced as the La(III) concentration increases, while is weakened as plant population density increases. This study would provide a reference for the further research on the ecotoxicology of REEs, and show a a new perspective and basis for the objective assessment of the environmental risks of REEs.

One sentence summary

La(III) pollution affects the root module growth and photosynthesis in soybean populations, and the effects vary depending on soybean population densities.

中文翻译：

镧暴露对植物种群影响的新评估

稀土元素（REE）在环境中的积累最近已成为一个新的环境问题。关于稀土元素对植物在个体、器官、细胞和遗传水平上的影响已有许多研究。植物在自然条件下以种群形式存在，但人们对稀土元素对植物种群的影响知之甚少。本研究通过模拟La(III)污染，研究了镧(III)[La(III)]对不同密度大豆( Glycine max L)群体根模生长的影响。结果表明，La(III)浓度为0.40和1.20 mM时，根模块生长参数和叶片光合作用参数均下降，其中1.20 mM La(III)下降更为显着。此外，低密度大豆群体中上述参数比高密度大豆群体中下降更为显着。上述结果表明，0.40和1.20 mM La(III)对根模块生长的抑制作用与抑制大豆群体光合作用密切相关。此外，La(III)对大豆群体根模块生长的抑制作用随着La(III)浓度的增加而增强，而随着植物群体密度的增加而减弱。本研究将为稀土元素生态毒理学的进一步研究提供参考，为客观评价稀土元素环境风险提供新的视角和依据。