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Zinc Oxide Nanoparticles Induced Oxidative Stress and Changes in the Photosynthetic Apparatus in Fenugreek (Trigonella foenum graecum L.)

Author:
Chemingui, Hajer, Smiri, Moez, Missaoui, Takwa, Hafiane, Amor
Source:
Bulletin of environmental contamination and toxicology 2019 v.102 no.4 pp. 477-485
ISSN:
0007-4861
Subject:
Trigonella foenum-graecum, antioxidants, bioavailability, biosynthesis, chlorophyll, fenugreek, leaves, nanoparticles, nanosheets, oxidative stress, photosynthesis, pigments, roots, toxicity, zinc oxide
Abstract:
The aim of this work was to study the toxicity of nanosheet zinc oxide nanoparticle with the size of 45 nm. The penetration of nanoparticles at an exposure by a localized spray does not make it possible to understand the mechanism of transport and bioavailability of the nanoparticles. In contrast, nanoparticles penetrated, via the roots, as a function of their diameter, the smaller ones having caused leaf stress (by translocation) at low concentrations. So that the choice of method of root application. Plants treated with 50 mg L⁻¹ of ZnO-NPs presented disturbance in leaf due to changes in chlorophyll’s biosynthesis. The highest value of the photosynthetic pigments was recorded at 5 mg L⁻¹ of ZnO-NPs. However, the treatment with 50 mg L⁻¹ of ZnO-NPs caused a decrease in the levels of chlorophyll a and b. Moreover, ZnO-NPs leaves significantly enhanced antioxidant enzymes activities.
Agid:
6373028