Crude oil induces plant growth and antioxidant production in Leersia hexandra Sw

Jose Alberto Orocio-Carrillo, Maria del Carmen Rivera-Cruz, Antonio Juárez-Mandonado, Consuelo del Carmen Bautista-Muñoz, Antonio Trujillo-Narcía, Yolanda García-González and Said Cadena-Villegas
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Jose Alberto Orocio-Carrillo: Tabasco Campus Postgraduate College, Doctorate in Agricultural Sciences in the Tropics, Cárdenas, Tabasco, México
Maria del Carmen Rivera-Cruz: Tabasco Campus Postgraduate College, Doctorate in Agricultural Sciences in the Tropics, Cárdenas, Tabasco, México
Antonio Juárez-Mandonado: Department of Botany, Antonio Narro Autonomous Agrarian University, Buenavista, Saltillo, Coahuila, México
Consuelo del Carmen Bautista-Muñoz: Tabasco Campus Postgraduate College, Doctorate in Agricultural Sciences in the Tropics, Cárdenas, Tabasco, México
Antonio Trujillo-Narcía: Energy and Environment Academic Body, Popular University of Chontalpa, Cárdenas, Tabasco, México
Yolanda García-González: Department of Botany, Antonio Narro Autonomous Agrarian University, Buenavista, Saltillo, Coahuila, México
Said Cadena-Villegas: Tabasco Campus Postgraduate College, Doctorate in Agricultural Sciences in the Tropics, Cárdenas, Tabasco, México

Plant, Soil and Environment, 2024, vol. 70, issue 2, 72-83

Abstract: The potential of Leersia hexandra grass in phytoremediation and natural attenuation of three groups of bacteria in soil contaminated with crude oil was evaluated for 180 days. The quantities of new shoots, root and aerial biomass were evaluated; changes in antioxidant concentrations in leaf and root caused by abiotic stress; population densities of Azotobacter, Azospirillum and Pseudomonas; and microbial respiration. The experimental data showed oil-induced increases of 315% and 196% in new shoots and root phytomass, respectively, and a 44% decrease in leaf + stem phytomass. The enzymatic defence in the grass leaf was manifested by higher concentrations of hydrogen peroxide, phenylalanine ammonium lyase and total flavonoids; the increases fluctuated from 35% to 52%. The response in the root was positive in catalase (16%), and in ammonium phenylalanine lyase, it increased 275% due to the effect of crude oil. The group of indigenous Azotobacter bacteria were tolerant to crude oil exposure, both in the phytoremediation process and in natural attenuation; the population densities varied from 212 to 438 × 103 colony-forming units (CFUs); they are greater than 49% to 106% compared to densities in control soil. Azospirillum spp. and Pseudomonas spp. recorded population abiotic stress. The grass activates enzymatic and plant defence, complementing microbial respiration in response to adaptation to crude oil.

Keywords: adaptation; hydrocarbon stress; phytotoxic effect; resistance; tolerance; root biomass; total phenols (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:70:y:2024:i:2:id:311-2023-pse

DOI: 10.17221/311/2023-PSE

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