Morpho-physiological Tolerance Mechanisms of Talinum patens to Lead

The objective of this study was to evaluate lead phytotoxicity on Talinum patens and the morpho-physiological tolerance mechanisms. The following parameters were considered: germination percentage, germination speed index, root and shoot length, fresh and dry matter, lead content in tissues, enzymat...

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Veröffentlicht in:Water, air, and soil pollution air, and soil pollution, 2018-01, Vol.229 (1), p.1-12, Article 4
Hauptverfasser: Gonzales de Souza, Guilherme, Mendes Pinheiro, Ana Lúcia, Silva, Josiele Aparecida, Veroneze-Júnior, Valdir, Carvalho, Marília, Bertoli, Alexandre Carvalho, Barbosa, Sandro, Corrêa de Souza, Thiago
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container_issue 1
container_start_page 1
container_title Water, air, and soil pollution
container_volume 229
creator Gonzales de Souza, Guilherme
Mendes Pinheiro, Ana Lúcia
Silva, Josiele Aparecida
Veroneze-Júnior, Valdir
Carvalho, Marília
Bertoli, Alexandre Carvalho
Barbosa, Sandro
Corrêa de Souza, Thiago
description The objective of this study was to evaluate lead phytotoxicity on Talinum patens and the morpho-physiological tolerance mechanisms. The following parameters were considered: germination percentage, germination speed index, root and shoot length, fresh and dry matter, lead content in tissues, enzymatic antioxidant system, proline content, lipid peroxidation, root anatomy, cytogenetic analysis, and chlorophyll fluorescence. The experimental design was completely randomized, with five concentrations: 0, 50, 100, 250, and 500 μM Pb(NO 3 ) 2 and five replicates. Exposure to Pb(NO 3 ) 2 solutions did not influence germination, shoot length, or fresh and dry matter. However, a Pb(NO 3 ) 2 -dependent concentration effect was observed, which reduced cell division in the root meristematic zone (mitotic index), reducing their length. Superoxide dismutase, catalase, and ascorbate peroxidase showed increased activity when exposed to lead, and the same effect was detected for proline content and lipid peroxidation. There was an increase in the dissipation of excess energy in photosystems, as well as an increase in epidermal thickness. Therefore, Talinum patens plants had morpho-physiological characteristics that favor their germination, development, and metal tolerance.
doi_str_mv 10.1007/s11270-017-3658-0
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The following parameters were considered: germination percentage, germination speed index, root and shoot length, fresh and dry matter, lead content in tissues, enzymatic antioxidant system, proline content, lipid peroxidation, root anatomy, cytogenetic analysis, and chlorophyll fluorescence. The experimental design was completely randomized, with five concentrations: 0, 50, 100, 250, and 500 μM Pb(NO 3 ) 2 and five replicates. Exposure to Pb(NO 3 ) 2 solutions did not influence germination, shoot length, or fresh and dry matter. However, a Pb(NO 3 ) 2 -dependent concentration effect was observed, which reduced cell division in the root meristematic zone (mitotic index), reducing their length. Superoxide dismutase, catalase, and ascorbate peroxidase showed increased activity when exposed to lead, and the same effect was detected for proline content and lipid peroxidation. There was an increase in the dissipation of excess energy in photosystems, as well as an increase in epidermal thickness. Therefore, Talinum patens plants had morpho-physiological characteristics that favor their germination, development, and metal tolerance.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s11270-017-3658-0</doi><tpages>12</tpages></addata></record>
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ispartof Water, air, and soil pollution, 2018-01, Vol.229 (1), p.1-12, Article 4
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subjects Analysis
Antioxidants
Ascorbic acid
Atmospheric Protection/Air Quality Control/Air Pollution
Catalase
Cell division
Chlorophyll
Chlorophylls
Climate Change/Climate Change Impacts
Dry matter
Earth and Environmental Science
Environment
Environmental monitoring
Enzymes
Experimental design
Fluorescence
Germination
Heavy metals
Hydrogeology
L-Ascorbate peroxidase
Lead
Length
Lipid peroxidation
Lipids
Peroxidase
Peroxidation
Photosystems
Physiological aspects
Physiology
Phytotoxicity
Proline
Soil Science & Conservation
Solutions
Superoxide dismutase
Talinum
Tissue
Water Quality/Water Pollution
title Morpho-physiological Tolerance Mechanisms of Talinum patens to Lead
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