Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.14279/19251
Title: | Hexavalent chromium leads to differential hormetic or damaging effects in alfalfa (Medicago sativa L.) plants in a concentration-dependent manner by regulating nitro-oxidative and proline metabolism | Authors: | Christou, Anastasis Georgiadou, Egli C. Zissimos, A. M. Christoforou, Irene C. Christofi, Christos Neocleous, Damianos Dalias, Panagiotis Torrado, Sofia O.C.A. Argyraki, Ariadne Fotopoulos, Vasileios |
Major Field of Science: | Agricultural Sciences | Field Category: | Agriculture Forestry and Fisheries | Keywords: | Alfalfa;Antioxidants;Chromium;Nitric oxide;Phytotoxicity;Proline | Issue Date: | Dec-2020 | Source: | Environmental Pollution, 2020, vol. 267, articl. no. 115379 | Volume: | 267 | Journal: | Environmental Pollution | Abstract: | Chromium has been proven to be extremely phytotoxic. This study explored the impacts of increasing Cr(VI) exposure (up to 10 mg L−1 K2Cr2O7) on the growth and development of alfalfa plants and adaptation responses employed, in an environmentally relevant context. The threshold concentration of K2Cr2O7 in irrigation water beyond which stress responses are initiated is 1 mg L−1. Lower Cr(VI) exposure (0.5 mg L−1 K2Cr2O7) induced hormesis, evident through increased biomass and larger leaves, likely mediated by increased NO content (supported by elevated NR enzymatic activity and overexpression of NR and ndh genes). Elevated Cr(VI) exposure (5 and 10 mg L−1 K2Cr2O7) resulted in reduced biomass and smaller leaves, and lower levels of photosynthetic pigment (10 mg L−1 K2Cr2O7). Higher levels of lipid peroxidation, H2O2 and NO contents in these plants suggested nitro-oxidative stress. Stress responses included increased SOD and CAT enzymatic activities, further supported to some extent by MnSOD, FeSOD, Cu/ZnSOD and CAT transcripts levels. GST7 and GST17 gene expression patterns, as well as proline content, P5CS enzymatic activity and corresponding P5CS and P5CR gene expression levels emphasized the role of proline and GSTs in the adaptation responses. Results highlight the importance of managing Cr(VI) levels in irrigation water. | URI: | https://hdl.handle.net/20.500.14279/19251 | ISSN: | 02697491 | DOI: | 10.1016/j.envpol.2020.115379 | Rights: | © Elsevier | Type: | Article | Affiliation : | Ministry of Agriculture, Rural Development and Environment, Cyprus Cyprus University of Technology National and Kapodistrian University of Athens |
Publication Type: | Peer Reviewed |
Appears in Collections: | Άρθρα/Articles |
CORE Recommender
SCOPUSTM
Citations
27
checked on Nov 6, 2023
WEB OF SCIENCETM
Citations
20
Last Week
0
0
Last month
0
0
checked on Oct 29, 2023
Page view(s)
341
Last Week
0
0
Last month
2
2
checked on Nov 21, 2024
Google ScholarTM
Check
Altmetric
This item is licensed under a Creative Commons License