Tolerance and phytoremediation potential of grass species native to South American grasslands to copper-contaminated soils. Issue 7 (7th June 2021)

• Record Type: Journal Article
• Authors: De Conti, Lessandro; Marques, Anderson Cesar Ramos; Ceretta, Carlos Alberto; Tarouco, Camila Peligrinotti; Nicoloso, Fernando Teixeira; Ferreira, Paulo Ademar Avelar; Tiecher, Tadeu Luis; Tassinari, Adriele; Bicalho da Silva, Isley Cristiellem; Brunetto, Gustavo
• Is Part Of: International journal of phytoremediation. Volume 23:Issue 7(2021)
• Page Start: 726
• Page End: 735
• Publication Date: 2021-06-07
• Subjects: Cover crops -- heavy metals -- ionic speciation -- native plants; Phytoremediation -- Periodicals; 628.5
• DOI: 10.1080/15226514.2020.1852528
• Languages: English
• ISSNs: 1522-6514

Abstract

Abstract: Grass species native to South American can have mechanisms to tolerate copper (Cu) excess, which improves their use to phytoremediate Cu-contaminated soils . The aims of the present study are to assess the tolerance of grass species native to South American grasslands to copper-contaminated soils, as well as their adaptive responses under high Cu-stressed condition and to identify native grass species presenting the highest potential to be used for phytoremediation purposes. Soil samples were air-dried and their acidity, phosphorus and potassium levels were corrected, and the samples were incubated. Three Cu levels were used in the experiment: natural (Dose 0), with added of 40 mg kg −1 of Cu and with added of 80 mg kg −1 of Cu. Three Axonopus affinis, Paspalum notatum and Paspalum plicatulum seedlings were transferred to 5-L pots filled with soil in August and grown for 121 days. Soil solution was collected during cultivation with the aid of Rhizon lysimeters. Main concentrations of cations and anions, dissolved organic carbon and pH in the soil solution were analyzed and the ionic speciation was carried out. Cu toxicity impaired the growth of grass species native to South America, since Cu excess led to both changes in root morphology and nutritional unbalance. Among all assessed native species, Paspalum plicatulum was the one presenting the greatest potential to phytostabilize in Cu-contaminated soils, since it mainly accumulates Cu absorbed in the roots; therefore, its intercropping with grapevines is can be beneficial in Cu-contaminated soils.