Trace elements-induced phytohormesis: a critical review and mechanistic interpretation

Shahid, Muhammad and Niazi, Nabeel Khan and Rinklebe, Jorg and Bundschuh, Jochen and Dumat, Camille and Pinelli, Eric (2020) Trace elements-induced phytohormesis: a critical review and mechanistic interpretation. Critical Reviews in Environmental Science and Technology, 50 (19). pp. 1984-2015. ISSN 1064-3389

Abstract

Despite considerable research about biogeochemical behavior of trace elements (TEs) in soil-plant-human systems, there is still a gap of knowledge regarding dose–response relationship, especially for low-applied doses. Trace elements such as mercury, cadmium, antimony and others are highly toxic, without any known essential function in plants. Nevertheless, recent toxicology and risk assessment studies revealed TE-induced hormesis in plants, i.e. stimulation in plant growth at low-doses while suppression at high-doses. This is the first review critically reviewing the TE-induced phytohormetic. The review compares hormetic effects for 366 observations from various research articles among different (i) toxic TEs, (ii) plant species, (iii) plant response parameters (end points), and (iv) exposure durations. It was observed that various toxic TEs, especially Cd, induce hormesis in plants. The mean value of Maximum Stimulatory Response (MAX) was 27% higher compared to the control response, with a range of 0.71 to 1122%. This review critically highlights the TE-induced phytohormesis by discussing possible mechanisms such as the (i) activation of plant tolerance mechanisms after TE-induced overproduction of reactive oxygen species (ROS), and (ii) interplay between phytohormones and TE-mediated ROS production towards plant growth. Highlights First review highlighting trace elements-induced hormesis in plants Trace elements -induced phytohormesis is evaluated for 366 endpoints The hormesis varies for different plants, trace elements, endpoints & durations Activation of plant defense and phytohormones results trace elements-induced hormesis Validation of mechanisms of trace elements-mediated phytohormesis is required.

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Item Type:	Article (Commonwealth Reporting Category C)
Refereed:	Yes
Item Status:	Live Archive
Additional Information:	Published online: 15 November 2019. Permanent restricted access to ArticleFirst version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre:	Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre:	Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Date Deposited:	28 Feb 2020 03:08
Last Modified:	23 Apr 2021 06:09
Uncontrolled Keywords:	trace elements, dose–response, relationship and mechanisms, hormesis, plants
Fields of Research (2008):	05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070399 Crop and Pasture Production not elsewhere classified 05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Fields of Research (2020):	41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3004 Crop and pasture production > 300499 Crop and pasture production not elsewhere classified 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management
Socio-Economic Objectives (2008):	D Environment > 96 Environment > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified
Identification Number or DOI:	https://doi.org/10.1080/10643389.2019.1689061
URI:	http://eprints.usq.edu.au/id/eprint/38011

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