Author(s) Subramanyam, K.; Laing, G.Du; Van Damme, E.J.M.
Journal Front Plant Sci
Date Published 2019

Soil salinity is one of the important abiotic stress factors that affect rice productivity and quality. Research with several dicotyledonous plants indicated that the detrimental effects associated with salinity stress can (partly) be overcome by the external application of antioxidative substances. For instance, sodium selenate (NaSeO) significantly improved the growth and productivity of several crops under various abiotic stress conditions. At present there is no report describing the impact of NaSeO on salinity stressed cereals such as rice. Rice cultivation is threatened by increasing salinity stress, and in future this problem will further be aggravated by global warming and sea level rise, impacting coastal areas. The current study reports on the effect of NaSeO in alleviating salinity stress in rice plants. The optimal concentration of NaSeO and the most efficient mode of selenium application were investigated. Selenium, sodium, and potassium contents in leaves were determined. Antioxidant enzyme activities as well as proline, hydrogen peroxide (HO), and malondialdehyde (MDA) concentrations were analyzed. In addition, the transcript levels for 1, an important Na/H antiporter, were quantified. Treatment of 2-week-old rice plants under 150 mM NaCl stress with 6 mg l NaSeO improved the total biomass. A significantly higher biomass was observed for the plants that received NaSeO by a combination of seed priming and foliar spray compared to the individual treatments. The NaSeO application enhanced the activity of antioxidant enzymes (SOD, APX, CAT, and GSH-Px), increased the proline content, and reduced HO and MDA concentrations in plants under NaCl stress. These biochemical changes were accompanied by increased transcript levels for 1 resulting in a higher K/Na ratio in the rice plants under NaCl stress. The results suggest that NaSeO treatment alleviates the adverse effect of salinity on rice plant growth through enhancing the antioxidant defense system and increase of 1 transcript levels.

DOI 10.3389/fpls.2019.00116
ISSN 1664-462X
Citation Front Plant Sci. 2019;10:116.

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