Title:	Iron fertilization to enhance tolerance mechanisms to copper toxicityof ryegrass plants used as cover crop in vineyards.
Authors:	DE CONTI, L. CESCO, S. MIMMO, T. PII, Y. VALENINUZZI, F. MELO, G. W. B. de CERETTA, C. A. TRENTIN, E. MARQUES, A. C. R. BRUNETTO, G.
Affiliation:	Lessandro De Conti, Federal Institute of Education, Science and Technology Farroupilha, 98590-000, Santo Augusto, RS, Brazil; Stefano Cesco, Faculty of Science and Technology, Free University of Bolzano, I-39100, Bolzano, Italy; Tanja Mimmo, Faculty of Science and Technology, Free University of Bolzano, I-39100, Bolzano, Italy; Yourii Pii, Faculty of Science and Technology, Free University of Bolzano, I-39100, Bolzano, Italy; Fabio Valeninuzzi, Faculty of Science and Technology, Free University of Bolzano, I-39100, Bolzano, Italy; GEORGE WELLINGTON BASTOS DE MELO, CNPUV; Carlos A. Ceretta, Department of Soil Science of the Federal University of Santa Maria, 97105-900, Santa Maria, RS, Brazil; Edicarla Trentin, Department of Soil Science of the Federal University of Santa Maria, 97105-900, Santa Maria, RS, Brazil; Anderson C. R. Marques, Department of Soil Science of the Federal University of Santa Maria, 97105-900, Santa Maria, RS, Brazil; Gustavo Brunetto, Department of Soil Science of the Federal University of Santa Maria, 97105-900, Santa Maria, RS, Brazil.
Date Issued:	2019
Citation:	Chemosphere, v. 243, (e-125298), 2019.
Description:	Ryegrass (Lolium perenneL.) is a plant species that can express mechanisms of tolerance to copper (Cu)toxicity. Therefore, the agronomical approach of intercropping system with ryegrass may represent apromising tool to limit the onset of Cu toxicity symptoms in the other intercropped plants species,particularly when an inadequate nutrient availability like iron (Fe) shortage is also concurrently present.This study aimed at assessing the mechanisms involved in the mitigation of Cu phytotoxicity and thestress effects on plant growth, root morphology and nutrition of ryegrass fertilized with two different Fesources. To this purpose, seedlings of ryegrass were hydroponically grown for 14 days in controlledconditions with 4 different levels of Cu (0.2, 5.0, 25 and 50mM) and with either 100mM Fe-EDDHA or Fe-EDTA. Results show that high levels of Cu availability enhanced the root content of organic anions as wellas the root exudation. Different Fe fertilizations at the condition of 50mM Cu induced changes in rootphenolic compounds, citrate and fumarate contents and the exudation pattern of phenolic compounds.Differences in plant growth were not observed between the two Fe sources, although Cu concentration inplant tissue fed with Fe-EDTA was lower in the condition of 50mM Cu. The enhanced root exudation ofCu-complexing organic compounds (including phenolics) in ryegrass plants when exposed to excessiveCu availability could be at the basis of the ameliorated edaphic rhizosphere conditions (lower Cuavailability). For this reason, from the agronomical point of view ryegrass plants used in intercroppingsystems with crops like vine plants could represent a promising strategy to control Cu toxicity invineyard soils. Further studies under thefield conditions must be taken to support presentfindings.©2019 Elsevier Ltd. All rights reserved.
NAL Thesaurus:	Root exudates Heavy metals Amino acids Phytoremediation
Keywords:	Phenolics Organic acids
DOI:	https://doi.org/10.1016/j.chemosphere.2019.125298
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPUV)