Mineral content and bioactive compound accumulation in hydroponically grown rocket due to sodium chloride concentration in nutrient solution

Cilj ovog rada bio je ispitati utjecaj solnog stresa na morfometrijske pokazatelje, akumulaciju bioaktivnih spojeva i sadržaj makroelemenata u hidroponski uzgojenoj rigi. Solni stres je ostvaren dodavanjem NaCl-a u hranive otopine u kojima su biljke rige uzgajane. Aplicirane su tri razine koncentracije NaCl-a (2,92 g/l, 5,27 g/l, 7,62 g/l). Tijekom uzgoja rige, praćeni su abiotski pokazatelji uzgoja biljaka: temperatura i relativna vlažnost zraka. Također, praćeni su i korigirani pokazatelji hranive otopine: pH-vrijednost, električni konduktivitet (EC) te koncentracija otopljenog kisika (DO). Solni stres negativno je utjecao na morfometrijske pokazatelje (duljina lišća, masa lišća, broj listova) rige te na prinos. Najveći utvrđeni prinos iznosio je 2,77 kg/m2 kod rige uzgajane bez solnog stresa, dok je najmanji prinos utvrđen kod rige uzgajane pri koncentraciji NaCl-a od 5,27 g/L. Solni stres negativno je utjecao i na akumulaciju svih makroelemenata u lišću rige. Utvrđeno je postepeno smanjivanje koncentracije makroelemenata uvjetovano povećanjem koncentracije NaCl-a u hranivoj otopini. Na akumulaciju vitamina C, ukupnih fenola te ukupnih glukozinolata solni stres djelovao je pozitivno, ali pri različitim koncentracijama NaCl-a u hranivoj otopini. Utvrđeno je kako je solni stres negativno utjecao na akumulaciju ukupnog klorofila.The goal of this paper was to determine the effect of salt stress on morphological traits, bioactive compound accumulation and macroelement content of rocket grown in floating hydropon. Salt stress was applied by adding sodium chloride into the nutrient solution. Three levels of sodium chloride concentrations were applied (2,92 g/l, 5,27 g/l, 7,62 g/l). Abiotic parameters such as air temperature and humidity as well as parameters of nutrient solution (pH, EC and dissolved oxygen concentration) were measured during the experiment. Nutrient solution parameters were also corrected if necessary. Rocket morphological traits and yield were negatively affected by salt stress. Salt stress also had a negative effect on macroelement accumulation. Vitamin C, total phenols, and total glucosinolates accumulation were positively affected by salt stres. However, different sodium chloride concentrations positively induced vitamin C, total phenols and glucosinolates accumulation. Salt stress also had a negative effect on the total chlorophyll content