The effect of salt stress on respiration, PSII function, chlorophyll, carbohydrate and nitrogen content in crop plants
Journal Title: International Journal of Farming and Allied Sciences - Year 2014, Vol 3, Issue 9
Abstract
Salinity is the major environmental factor limiting plant growth and productivity. Plants are subjected to various stresses, which they express by their response in the form of various biochemical changes in them, which may or may not beneficial to them. Salinity has a two-phase effect on plant growth, an osmotic effect due to salts in the outside solution and ion toxicity in a second phase due to salt buildup in transpiring leaves. Salt tolerance in higher plants is regulated by a number of different physiological and biochemical processes. There is evidence that high levels of salt cause an unbalance of the cellular ions leading in both ion toxicity and osmotic stress, leading to the production of active O2 species (AOS) such as superoxide (O2-), hydrogen peroxide (H2O2) and hydroxyl radicals (OH-). Basic metabolic pathways such as photosynthesis and respiration are affected by salinity. A response of respiration to salinity is primarily associated with the direct effects of salinity on enzyme function. Decrease in chlorophyll content caused by salinity have already been reported by many authors.
Authors and Affiliations
Ebrahim Sabbagh, Mohammad Lakzayi, Abbas Keshtehgar and Khashayar Rigi
Keywords
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