Effect of Organic Ligands on Accumulation of Copper in Hyperaccumulator and Nonaccumulator Commelina communis

Abstract

Better understanding of copper uptake and accumulation regulation in plants is critical to the phytoremediation of copper contaminated soil. This study employed a 30-day pot experiment to assess the relationship between organic ligands and copper accumulation in plants. Hyperaccumulator and nonaccumulator varieties of Commelina communis were used, different organic ligands were applied, and the data of copper accumulation in shoots were collected. The six organic ligands included ethylenediaminetetraacetic acid and organic acids (formic acid, citric acid, malic acid, tartaric acid, and succinic acid). The results showed that organic ligands added to culture increased the copper accumulation both varieties. The results of the copper accumulation in shoots agreed with the study of the root uptake kinetics of copper influx. The addition of organic acids could increase copper accumulation in shoots because the copper influx in roots was increased. The results also indicated that the copper influx of hyperaccumulator roots was higher than that of nonaccumulator roots. This is one of the mechanisms by which a hyperaccumulator could amass large amounts of copper in its shoots. In this accumulation process, little effect on the leaf relative water content was in the hyperaccumulator and nonaccumulator of leaves and normal physiological condition of plants.

Influence of Soil Chemistry and Plant Physiology in the Phytoremediation of Cu, Mn, and Zn

“…In general, organic acids can bind trace metal ions in soil solution by complexation reactions, making them more available for plant uptake (Wang and Zhong, 2011). However, organic acids can also reduce the soil pH and solubilize some non-labile fraction of trace metals in soil, thus enhancing trace metal availability (Perez-Esteban et al, 2013).…”

“…Some trace metals are chelated by organic acids, which are involved in trace metal absorption by plant roots, translocation in the xylem, and storage in the vacuole of leaf cells (Larbi et al, 2010;Wang and Zhong, 2011). Trace metals can also be bound by nicotianamine (NA) and mobilized by the yellow strike-like (YSL) family transporters (Chu et al, 2010;Harris et al, 2012).…”

Influence of Ca/Mg ratio and Cd2+ and Pb2+ elements on low molecular weight organic acid secretion by Salix viminalis L. roots into the rhizosphere

“…In soil, the predominant input of them is from root exudates, dead plant material and microbial decomposition products. Organic manures can also contain large amounts of organic acids (Wang and Zhong 2011). These root exudates are implicated in the weathering of soil minerals, mobilisation of soil nutrients (e.g.…”

“…They are able to form complexes with metal ions and modify the mobility of the metals in the rhizosphere (Maturi and Reddy 2008;Renella et al 2004) and their exudation is probably an internal mechanism against toxic effects of trace elements (Gasecka et al 2012). However, there is little information in the literature concerning the mechanism of how these compounds affect trace element accumulation in plants (Wang and Zhong 2011).…”

Phytoremediation of Heavy Metal Contaminated Water Using Potential Caspian Sea Wetland Plant: Nymphaeaceae

“…Aquatic plant communities are good candidates for treating groundwater contamination in engineered systems because of the large surface area, ease of culture and high organic uptake potential 15 . The Co and Cu accumulators have been found in more than dozen families [16][17][18][19][20][21][22] . Based on the database, Akhani et al have recently demonstrated that the flora of the south Caspian Area included 3234 species belonging to 856 genera and 148 families of vascular plants which are known from the geographic boundaries of the three provinces Gilan, Mazandaran and Golestan and Talish in Azerbaijan Republic.…”