Ecophysiological response of Lippia gracilis (Verbanaceae) to duration of salt stress.

Autor: Oliveira FFM; Programa de Pós-graduação em Ciências Naturais (PPGCN), Universidade do Estado do Rio Grande do Norte (UERN), Rua Professor Antônio Campos, s/n, CEP: 59600-000, Mossoró-RN, Brazil. Electronic address: ffabiomesquita@gmail.com., Morais MB; Programa de Pós-graduação em Ciências Naturais (PPGCN), Universidade do Estado do Rio Grande do Norte (UERN), Rua Professor Antônio Campos, s/n, CEP: 59600-000, Mossoró-RN, Brazil. Electronic address: marciana.bio@gmail.com., Silva MES; Departamento de Ciências Biológicas, Faculdade de Ciências Exatas e Naturais (FANAT), Universidade do Estado do Rio Grande do Norte (UERN), Brazil. Electronic address: marcos.emanuelme@gmail.com., Saraiva YKF; Programa de Pós-graduação em Ciências Naturais (PPGCN), Universidade do Estado do Rio Grande do Norte (UERN), Rua Professor Antônio Campos, s/n, CEP: 59600-000, Mossoró-RN, Brazil. Electronic address: ykfsb@hotmail.com., Arruda MVM; Departamento de Ciências Biológicas, Faculdade de Ciências Exatas e Naturais (FANAT), Universidade do Estado do Rio Grande do Norte (UERN), Brazil. Electronic address: valdigleziaarruda@yahoo.com.br., Silva JNCE; Departamento de Química, Faculdade de Ciências Exatas e Naturais (FANAT), Universidade do Estado do Rio Grande do Norte (UERN), Brazil. Electronic address: jjessicanayara30@gmail.com., Albuquerque CC; Programa de Pós-graduação em Ciências Naturais (PPGCN), Universidade do Estado do Rio Grande do Norte (UERN), Rua Professor Antônio Campos, s/n, CEP: 59600-000, Mossoró-RN, Brazil; Departamento de Ciências Biológicas, Faculdade de Ciências Exatas e Naturais (FANAT), Universidade do Estado do Rio Grande do Norte (UERN), Brazil. Electronic address: cycavalcanti@gmail.com.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2019 Aug 30; Vol. 178, pp. 202-210. Date of Electronic Publication: 2019 Apr 19.
DOI: 10.1016/j.ecoenv.2019.04.016
Abstrakt: The objective of this work was to investigate the effects of salinized water on Lippia gracilis by determining the ion accumulation capacity and morphophysiological changes as a function of salinity and time of exposure to stress. L. gracilis was irrigated with water containing different concentrations of salts and electrical conductivities. The analyses were conducted 25 and 50 days after stress (DAS), in leaf, stem/branches, and roots. Plant height (Hplants), basal stem diameter (Φstem), and mean unitary leaf area (ULA) were determined. After that, the plant material was dried, and the total dry biomass (TDB) (in g plant -1 ), leaf dry biomass (LDB), stem dry biomass (SDB), and the roots dry biomass (RDB) were determined. Based on these data, the following variables were calculated: total leaf area (TLA) in cm 2 plant -1 ; biomass allocation fraction (BAF) obtained by dividing the biomass of the stem, leaves, and roots, separately, with the total plant biomass; relative growth rate (RGR); net assimilation rate (NAR); leaf area ratio (LAR); specific leaf area (SLA); and sclerophylly index (SI). The concentrations of potassium and sodium ions were quantified by atomic absorption spectrophotometry and the chloride ion concentration was determined by argentometric titration. L. gracilis showed a variable response to salt stress as a function of time, having a considerable capacity to withstand an increasing load of toxic ions, while maintaining a positive growth rate, highlighting the potential use of the species in moderately saline environments.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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