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Involvement of ethylene signaling in zinc oxide nanoparticle mediated biochemical changes in Arabidopsis thaliana leaves

Abstract

The growing use of metallic nanoparticles in the industries has resulted in its accumulation in the agricultural land, imposing a serious threat to yield and quality of crops worldwide. Various reports showed that plants face environmental stress through hormones, but regulation of ethylene under ZnO NPs stress is not yet known. In this study, Ethylene signaling defective mutants (etr1-3, ein2-1) were studied in comparison to Arabidopsis wild type under ZnO NPs stress. We found that ZnO NPs significantly inhibited the growth of Arabidopsis and induced toxicity by regulating the expression of cell cycle-related genes. More importantly our results showed the involvement of ethylene signaling and biosynthesis in this process. ZnO NPs affected the biomass, chlorophyll and sugar contents in both ethylene-insensitive mutants and wild type plants. Higher ROS accumulation and increased lipid peroxidation showed that ZnO NPs induced toxicity in Arabidopsis. High rate of antioxidant enzyme activites and mRNA transcript levels of their corresponding genes in mutants plants, clearly showed tolerant ability of ethylene insensitive mutants than wild type plants against oxidative damage caused by ZnO NPs stress. Taken together our results showed that ethylene-insensitive mutants tolerated ZnO NPs induced stress more efficiently than WT. These results suggested that ethylene induced oxidative damage in plants under ZnO NPs stress.

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Publication details

The article was received on 03 Sep 2018, accepted on 05 Dec 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8EN00971F
Citation: Environ. Sci.: Nano, 2018, Accepted Manuscript
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    Involvement of ethylene signaling in zinc oxide nanoparticle mediated biochemical changes in Arabidopsis thaliana leaves

    A. R. Khan, A. Wakeel, N. Muhammad, B. Liu, M. Wu, Y. Liu, I. Ali, S. H. R. Zaidi, W. Azhar, G. Song, J. Wu and Y. Gan, Environ. Sci.: Nano, 2018, Accepted Manuscript , DOI: 10.1039/C8EN00971F

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