| Summary: | The study was conducted to determine the influence of fluorine soil contamination (100, 200 and 300 mg kg<sup>−1</sup> of soil) on the levels of exogenous amino acids (ExAAs) and endogenous amino acids (EnAAs) in the above-ground parts of winter oilseed rape and spring triticale grain. Fluorine soil contamination had a much more pronounced influence on the content of the tested amino acids in spring triticale grain than in the above-ground parts of winter oilseed rape. Soil contamination with fluorine had the greatest influence on leucine (Leu), arginine (Arg) and lysine (Lys), alanine (Ala), glycine (Gly) and glutamic acid (Glu), increasing their content, and on tyrosine (Tyr), methionine (Met) and aspartic acid (Asp), decreasing their concentration in the winter oilseed rape above-ground parts. Under the influence of fluorine soil contamination, an increase in the content of Arg, phenylalanine (Phe), histidine (His), Leu, Tyr, Gly, serine (Ser), Asp and especially, proline (Pro) and Glu, and a decrease in the level of Met and cysteine (Cys) in spring triticale grain have been confirmed. The highest fluorine contamination (300 mg kg<sup>−1</sup> of soil) had the most favourable influence on the total amino acid content in the spring triticale. The lowest fluorine dose (100 mg kg<sup>−1</sup> of soil) had the same effect in winter oilseed rape. Spring triticale protein had a higher nutritive value than that of winter oilseed rape. Fluorine soil contamination caused a gradual increase in the nutritive value of protein in spring triticale grain (in contrast to rape).
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