Effects of exogenous lanthanum(III) exposure on the positive interaction between mutually beneficial populations. (March 2020)

• Record Type: Journal Article
• Authors: Huang, Jialing; Hu, Xianda; Wang, Lihong; Zhou, Qing; Huang, Xiaohua
• Is Part Of: Chemosphere. Volume 242(2020)
• Publication Date: 2020-03
• Subjects: Rare earth element exposure -- Soybean populations -- Wheat populations -- Positive interaction -- Nutrient level -- Population density; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.125142
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Rare earth elements (REEs) are widely used in various fields, and their accumulation has been reported to pose environmental risks. Most studies confirmed the damage of excessive REE exposure to individual plants; however, little attention has been given to their effects on plant populations. A positive interaction indicates a mutually beneficial relationship between two populations, which is beneficial to the survival and growth of the populations. However, it remains unknown whether exogenous REEs affect the positive interactions between populations. This study investigated the effects of exogenous lanthanum(III) [La(III)] exposure on the positive interaction between soybean ( Glycine max L.) and wheat ( Triticum aestivum L.) populations by their modules. At normal nutrient level (½-strength Hoagland), the inhibition of excessive La(III) on population modules decreased with increasing population density. Decreases of 39.26 to 1.05% for soybean and 41.45 to 2.41% for wheat indicated the inhibition of La(III) on the positive interaction of both populations weakened with increasing population density. At low nutrient level (¼-strength Hoagland), the inhibition of excessive La(III) on population modules increased with increasing population density. Decreases of 5.82–57.14% for soybean and 4.22–59.04% for wheat indicated the inhibition of La(III) on the positive interaction of both population was strengthened with increasing population density. In summary, the inhibitory effects of exogenous La(III) exposure on the positive interaction between populations vary with both nutrient level and population density. This is a new factor that needs to be considered when evaluating the safety risks of REEs in the environment. Graphical abstract: Image 1048 Highlights: Exogenous La(III) inhibited the modules of two mutually beneficial populations. The effect of La(III) on modules altered the positive interaction of populations. Inhibition at normal nutrient level decreased with increasing population density. Inhibition at low nutrient level increased with increasing population density. Population biomass and root exudate affected by density lowered La(III) content. Abstract : One sentence summary: Exogenous La(III) exposure affects the positive interaction between soybean and wheat populations, which depends on nutrient level and population density.