engleski

Macroelements and specialized metabolites content under salt stress in hydroponically grown rocket

Salt stress at different plant species may affect the reduction or increase in the content of dry matter, biogenic elements and specialized metabolites. The goal of this research was to determine the effect of salt stress on specialized metabolites accumulation and macroelements’ content of hydroponically grown rocket which belongs to the group of functional food. Salt stress was realized by adding NaCl (2.92, 5.27 and 7.62 g L-1) into the standard nutrient solution with EC-value 3 dS m-1, which showed increase in EC-values (5, 7 and 9 dS m-1), respectively. The trial was set up in a floating system according to a randomized block design with three replications. Salt stress had negative effect on dry matter and content of macroelements (N, P, K, Ca and Mg), while the amount of Cl and Na was increased linearly. Salt stress had positive effect on vitamin C and total phenols content. The highest concentration of NaCl resulted in the significantly highest vitamin C content (88.07 mg 100 g-1 fresh weight). The highest total phenols content (173.6 and 173.4 mg GAE 100 g-1 fresh weight), without significant difference, was achieved at rocket grown in nutrient solutions with EC 7 and 9 dS m-1. The equal content of total chlorophyll (0.9 and 0.8 mg g-1 fresh weight) was determined at nutrient solution with standard and the highest EC-values (3 and 9 dS m-1), respectively. Nutrient solutions with higher NaCl concentrations resulted in significantly lower content of total glucosinolates in rocket leaves than the standard nutrient solution, as well as with the lowest NaCl concentration.

Eruca sativa Mill. ; vitamin C ; total glucosinolates ; phenols ; chlorophyll

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