Copper toxicity on photosynthetic responses and root morphology of Hymenaea courbaril L. (Caesalpinioideae)
| Autor: | Adriano Bortolotti da Silva, José Ricardo Mantovani, Paulo César Magalhães, Daniele Maria Marques, Thiago Corrêa de Souza, Valdir Veroneze Júnior |
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| Přispěvatelé: | Daniele Maria Marques, Universidade Federal de Alfenas, Valdir Veroneze Júnior, Universidade Federal de Alfenas, Adriano Bortolotti da Silva, Universidade José do Rosário Vellano, José Ricardo Mantovani, Universidade José do Rosário Vellano, PAULO CESAR MAGALHAES, CNPMS, Thiago Corrêa de Souza, Universidade Federal de Alfenas. |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Environmental Engineering Context (language use) Root system 010501 environmental sciences Photosynthesis 01 natural sciences Metal Pesado medicine Environmental Chemistry Toxicidade Hymenaea courbaril 0105 earth and related environmental sciences Water Science and Technology biology Chemistry Ecological Modeling Copper toxicity biology.organism_classification medicine.disease Pollution Phytoremediation Horticulture Raiz Cobre Compensation point Troca de gás Respiration rate 010606 plant biology & botany |
| Zdroj: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
| Popis: | Copper (Cu) is a micronutrient essential for plant development. However, in excess, it is toxic to plants and may cause various physiological and morphological changes. The study of the growth of plants exposed to excess Cu is important for the development of phytoremediation programs and for understanding the mechanisms involved in the tolerance of this metal. In this context, the objective of this research was to evaluate the effect of excess copper on photosynthetic responses and root morphology ofHymenaeacourbaril L. Biometric measurements, gas exchange, root morphology, and Cu content in tissues and indices (TI and TF) were assessed, involving metal content and biomass.Uptoaconcentrationof200mgkg−1,Cufavored growth, gas exchange, and root morphology of the plants under study. At a higher concentration (800 mg kg−1) in the soil, it affected plant growth and caused a decrease in photosynthetic rate. Biochemical limitations in photosynthesis were observed, as well as lower maximum net photosynthetic rate (Amax), respiration rate in the dark (Rd), light compensation point (LCP), light saturation point (LSP), and apparent quantum yield (α), when exposed toexcess Cu. Root length, surface area, mean diameter, root volume, dry biomass, andspecificrootlengthdecreasedwithhighCuconcentrationsinthe soil.Cuwasaccumulatedintheroots asa mechanism of tolerance to the excess of this metal in order to preserve the most metabolically active tissues presentintheleaves.Ataconcentrationof800mgkg−1, copper also caused inhibition of the root system. Plants ofH.courbarilshowedtolerancetoexcessCuinthesoil and can be indicated for the recovery of areas contaminated with this metal. Made available in DSpace on 2019-02-06T23:39:57Z (GMT). No. of bitstreams: 1 Coppertoxicity.pdf: 1567720 bytes, checksum: 4d6152931c7ed523392f36738a980521 (MD5) Previous issue date: 2019-02-06 |
| Databáze: | OpenAIRE |
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