PJB-2018-80
LOW IRON LEVEL IMPROVES SALT TOLERENCE BY CHANGING THE REDOX REGULATORY MECHANISMES IN ARABIDOPSIS THALIANA
NOELLA JOSIANE UMUHOZA KAREMERA
Abstract
Soil salinization is a critical limiting factor to plant growth. The soluble salt could lead to low crop growth and production, thus it is very crucial to improve plant salt tolerance. Iron (Fe) is involved in plant growth and development and many other metabolic pathways. Yet, little research on the relationship between iron content and salt tolerance has been done in previous works. By using a series of gradient Fe treatments, this study investigated the role of Fe in Arabidopsis thaliana tolerance to salt stress. Germination tryout results showed greater salt tolerance at lower Fe treatments than at higher Fe treatments. Some indicators, such as iron leakage, levels of sodium, potassium and reactive oxygen species of roots indicated also increased tolerance to salinity in case of low Fe treatments. The reduced glutathione levels of plants were decreased by salt stress and it indicated furthermore the increased damage of an oxidation state. Nevertheless, high Fe content tended to cause more damage to the redox system than low Fe content. In conclusion, Fe content had a significant function in resistance to salinity by plants, possibly due to its ability to bring about changes in the redox potential what may be the main reasons of the resistance to salt by plants.
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