Volume 6, Number 20 (vol. 6, no. 20, year 2017 2017)                   jppf 2017, 6(20): 65-70 | Back to browse issues page

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Associate Prof. Dr. Department of Biology, Payame Noor University (PNU), Iran , gader.habibi@gmail.com
Abstract:   (130 Views)

Selenium (Se) at high concentrations can cause toxic effects in plants, whereas at low concentrations it enhances resistance to certain abiotic stresses. The possible mechanisms of the Se-enhanced tolerance of plants to salinity stress remain elusive. In this work, effect of Se supplementation at 0, 0.1, 1 and 10 mg l-1 sodium selenate was studied in Lallemantia iberica plants subjected to salt stress. In pre-experiment design, The toxicity threshold for selenate was determined at the concentration of 10 mg l-1, as the biomass of L. iberica plants decreased if selenate concentrations in the growth medium reached 10 mg l-1. Thereafter, we used 0.1 mg l-1 Se to mitigate salt stress in L. iberica plants. Se at low concentration (0.1 mg l-1) mitigated salt-induced oxidative stress because of the NaCl-induced lipid peroxidation was smallest in the plants treated with Se, and was highest in the plants grown without Se addition. This occurred as a result of glutathione (GSH) accumulation in Se-supplied plants. Additionally, Se-supplied plants exhibited higher glutathione peroxidase (GSH-Px) activity than –Se ones after 2 days salt stress. These data provided the first evidence that the low-level Se pretreatment alleviated salt stress in L. iberica by increasing GSH levels and by decreasing ROS production; and therefore less reduction of biomass production during salt stress.

Full-Text [PDF 310 kb]   (41 Downloads)    
Type of Study: Research | Subject: Salt Stress
Received: 2016/03/25 | Accepted: 2016/12/14 | Published: 2017/08/27