## 3 Results
### Results of Spectrophotometric Analysis  
In plants, polyphenol synthesis is generally stimulated in response to stress factors. Therefore, polyphenols might be considered bioindicators for plant development in conditions other than the native ones, having, moreover, high economic importance. However, increasing polyphenol content in stressed plants restricts their biomass production [47]. However, it is specific to the saline environment. The effect of cultivation substrates on the accumulation of total phenolic content in the _Salicornia europaea_ L. plant is summarized in Figure 3. Spectrophotometric determination of the total phenolic content has been used as one of the fastest and simplest methods of quantification, even if there are interferences in absorbance at the same wavelength of substances such as proteins, nucleic acids, and amino acids [48]. The graphical representation was presented in the form of bars to highlight the difference between the cultivation substrates for the same species. Statistically, the results obtained are significantly different and were calculated for the probability of 0.05. Compared to the phenolic content of the plant grown in indigenous conditions (I = 118.08 \(\upmu\)g GAE\(\cdot\)mL\({}^{-1}\) extract), the highest values of the total phenolic content were 92.18 \(\upmu\)g GAE\(\cdot\)mL\({}^{-1}\) extract) recorded for the plant grown on the R cultivation substrate. The results show that the acidic cultivation substrate R (pH = 5.18) stimulated the accumulation of phenolic  
Figure 3: TPC—total phenolic content in _Salicornia europaea_ L. grown on different substrates. Values followed by the same letter(s) do not differ significantly at \(p\) = 0.05. Figure 2: The impact of _Salicornia europaea_ L. cultivation on EC variation. Values followed by the same letter(s) do not differ significantly at \(p\) = 0.05.  
compounds. This tendency is according to other published data on pH affecting almost all biological and chemical processes in plants [49]. Considering the purpose of our study, the results showed the possibility of cultivating this species on acidic soils with the aim of capitalizing on plants rich in phenolic content. Similar research was conducted by [PERSON] and [PERSON] [34] for _Salicornia europaea_ from the Ilena Valley natural reserve, obtaining 1.04 mg GAE\(\cdot\)g\({}^{-1}\) dry weight. Furthermore, findings confirming the positive biological effects of the species were recorded by [PERSON] et al. [31], who studied _Salicornia patula_ Duval-Jouve from the Iberian Peninsula (Spain). Moreover, the flavonoid content of _Salicornia europaea_ L. determined for all cultivation variants is shown in Figure 4. With regard to this, other studies should be regarded, primarily [PERSON]'s book chapter [49] showcasing that _Salicornia europaea_ contains quercetin, isoquercitrin, rutin, and isorhamentin 4\({}^{\prime}\)-glucose. In general, the content of flavonoids differs from one halophyte species to another [38]. In this work, within the same species, multiple variations were identified. Thus, for variants S1, S2, and S3, there were no significant differences, the TFC values varying between 0.422 and 0.426 mg \(\mathrm{RE}\cdot\mathrm{mL}^{-1}\) extract. Also, no significant differences were registered between the TFC of the indigenous plant (I) and the plant grown on acidic soil (R), the values being 0.604 and 0.589 mg \(\mathrm{RE}\cdot\mathrm{mL}^{-1}\) extract, respectively. Significant differences were observed between S1, S2, and S3 extracts and those from _Salicornia_ I and R.  
It should be noted that in this study, the amount of flavonoids is higher than that of polyphenols, which may be due to the solubility of these biocompounds [50]. The obtained results are similar to those obtained by [PERSON] et al. [51], where the same type of solvent extraction was used.