Abstract Among Brassica vegetables, cauliflower (Brassica oleracea var. botrytis) is widely recognized as a consumer favorite due to its rich and healthy content of nutrients and bioactive compounds. The enhancement of productivity and quality of preferred crops has gained highly importance in recent decades, driven by increasing customers demand for affordable and healthy food. Away from chemical materials and their risky side effects, biostimulants and biofertilizers could be a suitable alternative for traditional fertilizers under desert conditions. In a current study the extract of Liquorice root LRE and bread yeast BYE applied both with 0, 10, and 20 g/L on Brassica plant to explore their influence in curds metabolites. Obtained results showed that while carbohydrates reduced in curds of treated plants, protein increased with both stimulants application. The non-significant increasing in phenols and flavonoids content was observed in curds of LRE and BYE-treated plants with an elevation in antioxidant activity in their methanolic extracts. Both LRE and BYE applications promoted the curds content of macronutrients and caused a notable alteration in active compounds profile. Noteworthy, the values of acquired outcomes increased or decreased according to applied concentrations of individual or combination of both biostimulants. Based on our finding, the foliar application with LRE and BYE enhanced the primary and secondary metabolites of Brassica curds. However, the combination of 10 g/L of LRE and 20 g/L of BYE is recommended due to its act in promoting of flavonoids content, antioxidant capacity, potassium content and active compounds profile including organosulfur, troponoid, methyl 9-cis,11-trans-octadecadienoate, 1H-Indole-3-acetonitrile and 9,12,15-Octadecatrienoic acid.
Neamah et al. (Wed,) studied this question.