## 4 Conclusions  
In summary, the results of the above studies showed an increase in the iodine content of the potato tubers _Solanum tuberosum_ L. that was within a safe level for consumers (1 \(<\) HQ). Biofortification did not affect, in any negative way, the reduction in the yield weight relative to the whole plant. Biofortification with 8-OH-7-I-5 QSA was shown to improve the polyphenic profile of the potato tuber. In addition, it was shown to reduce the accumulation of the heavy metals Al, Ag, Pb and Tl in the potato tuber. Biofortification did not generate adverse changes in the basic composition of the potato tuber (dry matter, protein, fat, fibre, and digestible carbohydrates). Unfortunately, the only unwanted effect of this agrotechnology is a reduction in the carotenoid content of potato tubers. In the future, the research field of the cultivation of potato could be extended from the application of this process to research regarding the impact on the total carotenoid content. The refinement of this agrotechnology in practice may one day increase the content of iodine for consumers. The biofortification of _Solanum tuberosum_ L. with inorganic and organic forms of iodine compounds may, therefore, become an additional preventative measure against iodine deficiencies in humans and may become, in part, a healthier alternative to iodine table salt (potassium iodide). The combination of the two concepts, taking into account the positive health-promoting properties already present and the biofortification used to further enhance the potato's nutritional qualities, could create a vegetable with outstanding properties, the appropriate consumption of which will benefit the health of all consumers. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Treatment**} & **\% RDA I (in** & **\% RDA I (in** & **Daily Intake of** & **Daily Intake of** & **HQ for 100 g** & **HQ for 260 g** \\  & **100 g Portion** & **260 g Portion** & **Potato (mg** & **Potato (mg** & **Potato (mg** & **Potato** & **Potato** \\  & **of Potato**) & **of Potato** & **I-day\({}^{-1}\))** & **I-day\({}^{-1}\))** & \\ \hline Control & 0.31 b \({}^{\text{ }}\pm\) 0.05 & 0.82 b \({}^{\text{ }}\pm\) 0.12 & 0.001 b \({}^{\text{ }}\pm\) 0.00 & 0.001 b \({}^{\text{ }}\pm\) 0.00 & 0.001 b \({}^{\text{ }}\pm\) 0.00 & 0.003 b \({}^{\text{ }}\pm\) 0.00 \\ KIO\({}_{3}\) & 17.70 c \({}^{\text{ }}\pm\) 0.67 & 46.02 c \({}^{\text{ }}\pm\) 1.75 & 0.027 c \({}^{\text{ }}\pm\) 0.00 & 0.069 c \({}^{\text{ }}\pm\) 0.00 & 0.065 c \({}^{\text{ }}\pm\) 0.00 & 0.170 c \({}^{\text{ }}\pm\) 0.01 \\
8-OH-7-I-5 QSA & 7.26 a \({}^{\text{ }}\pm\) 1.86 & 18.88 a \({}^{\text{ }}\pm\) 4.83 & 0.011 a \({}^{\text{ }}\pm\) 0.00 & 0.028 a \({}^{\text{ }}\pm\) 0.01 & 0.027 a \({}^{\text{ }}\pm\) 0.01 & 0.070 a \({}^{\text{ }}\pm\) 0.02 \\
5-CI-7-I-8-Q & 6.16 a \({}^{\text{ }}\pm\) 0.56 & 16.02 a \({}^{\text{ }}\pm\) 1.45 & 0.009 a \({}^{\text{ }}\pm\) 0.00 & 0.024 a \({}^{\text{ }}\pm\) 0.00 & 0.022 a \({}^{\text{ }}\pm\) 0.00 & 0.057 a \({}^{\text{ }}\pm\) 0.01 \\ \hline \hline \end{tabular} Results are shown as mean \(\pm\) standard deviation (SD); \(n=4\); means followed by the same letter are not significantly different (\(p<0.05\)).  
\end{table} 
Table 6: Percentage coverage of Recommended Daily Allowance for iodine (% RDA-I) and the hazard quotient (HQ) for the intake of iodine via the consumption of 100 g and 260 g portions of fresh potato tubers by adults of 70 kg body weight.