NITROGEN-METABOLISM AND ESTERASE-ACTIVITY IN WHEAT-SEED ENDOSPERM AT THE STAGE OF HETEROTROPHIC NUTRITION WITH NOVEL BIOREGULATORS OF THE FUMAR FAMILY

When used for the presowing treatment of wheat seeds over a wide conce ntration range (10(-9) - 10(-4) M), the novel bioregulators of the Fum ar family outperform IAA and GA-3 in terms of utilization of the nitro gen reserves in the endosperm, the synthesis of structural and cytopla smic proteins, esterase activity, and growth of seedlings and roots at the stage of heterotrophic nutrition of the germinants. A correlation has been found between the bioregulator-induced activation of certain physiological and biochemical processes and the activity of leaf and root esterases in the germinants. Wheat esterase activity is controlle d by the Est12, Est1, Est2, Est4, and Est5 esterases in seedlings or b y the Est1, Est2, Est4, Est5, and Est11 esterases in roots. The relati onship between the expression of esterase genes and the structure of t he bioregulators is discussed.