Changes of dry matter, crude ash and total protein contents in triticale Gabo and Migo cv. whose seeds were pre- viously single radiated using red light, were found. The protein level in treated seeds increased by 10.2–16.2% in relation to non-treated ones. Crude ash and dry matter levels in both cultivar radiated seeds decreased by 0.3–1.1% of dry matter and 7–9% of crude ash as compared to non-radiated seeds. Red light radiation of seeds did not affect the phytate and alkyloresorcinole contents in seeds. Triticale seed radiation with red light caused the increase of mineral element contents, notably that of sodium, zinc and iron, but to a lesser extent of potassium and calcium; magnesium level decreased.