Coffea arabica seedlings genotypes are tolerant to high induced selenium stress: Evidence from physiological plant responses and antioxidative performance.

Autor: Mateus MPB; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil., Tavanti RFR; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil., Galindo FS; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil., Silva ACDR; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil., Gouveia GCC; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil., Aparecido CFF; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil., Carr NF; Center for Nuclear Energy in Agriculture (CENA), University of São Paulo (USP), Av. Centenário 303, Postal Code 13.400-970, Piracicaba, SP, Brazil., Feitosa YB; Center for Nuclear Energy in Agriculture (CENA), University of São Paulo (USP), Av. Centenário 303, Postal Code 13.400-970, Piracicaba, SP, Brazil., Santos EF; Federal Institute of Mato Grosso Do Sul (IFMS), MS-473, Km 23, Postal Code 75.750-000, Nova Andradina, MS, Brazil., Lavres J; Center for Nuclear Energy in Agriculture (CENA), University of São Paulo (USP), Av. Centenário 303, Postal Code 13.400-970, Piracicaba, SP, Brazil., Reis ARD; São Paulo State University (UNESP), Passeio Monção 830, Postal Code 15.385-000, Ilha Solteira, SP, Brazil; São Paulo State University (UNESP), Rua Domingos da Costa Lopes 780, Postal Code 17.602-496, Tupã, SP, Brazil. Electronic address: andre.reis@unesp.br.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2020 Oct 15; Vol. 203, pp. 111016. Date of Electronic Publication: 2020 Jul 19.
DOI: 10.1016/j.ecoenv.2020.111016
Abstrakt: Selenium (Se) is considered a beneficial element to higher plants based on its regulation of antioxidative system under abiotic or biotic stresses. However, the limit of beneficial and toxic physiological effects of Se is very narrow. In the present study, the antioxidant performance, nutritional composition, long-distance transport of Se, photosynthetic pigments, and growth of Coffea arabica genotypes in response to Se concentration in solution were evaluated. Five Coffea arabica genotypes (Obatã, IPR99, IAC125, IPR100 and Catucaí) were used, which were grown in the absence and presence of Se (0 and 1.0 mmol L -1 ) in nutrient solution. The application of 1 mmol L -1 Se promoted root browning in all genotypes. There were no visual symptoms of leaf toxicity, but there was a reduction in the concentration of phosphorus and sulfur in the shoots of plants exposed to high Se concentration. Except for genotype Obatã, the coffee seedlings presented strategies for regulating Se uptake by reducing long-distance transport of Se from roots to shoots. The concentrations of total chlorophyll, total pheophytin, and carotenoids were negatively affected in genotypes Obatã, IPR99, and IAC125 upon exposure to Se at 1 mmol L -1 . H 2 O 2 production was reduced in genotypes IPR99, IPR100, and IAC125 upon exposure to Se, resulting in lower activity of superoxide dismutase (SOD), and catalase (CAT). These results suggest that antioxidant metabolism was effective in regulating oxidative stress in plants treated with Se. The increase in sucrose, and decrease in SOD, CAT and ascorbate peroxidase (APX) activities, as well as Se compartmentalization in the roots, were the main biochemical and physiological modulatory effects of coffee seedlings under stress conditions due to excess of Se.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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