VARIATION OF NUCLEIC ACID AMOUNT AT TWO CULTIVARS OF TWO-ROW BARLEY (HORDEUM VULGARE L. CONVAR. DISTICHON (L.) ALEF.) AFTER SIMAZINE TREATMENT

The synthesis of nucleic acids (DNA and RNA) displayed modifications in the plantlets of Andra and Flora two-row barley cultivars, as a result of the treatment with Simazine herbicide, at 0.1%, 0.2%, 0.5%, and 1% concentrations, applied for 24 hours and 48 hours. The DNA amount is superior to that of control, the only exception being registered for Flora cultivar, at the variant treated for 24 hours with tested herbicide. RNA synthesis evolved almost in the same manner in the two cultivars: it increases in 24 h treated variants, and decreases in 48 h treated variants. The ratio between nucleic acids (RNA/DNA) decreases consecutively to Simazine increasing concentration, excepting Flora cultivar (24 h treated variant).