THE EFFECT OF HYDROXYCARBAM ON THE FROST-RESISTANCE OF WINTER-WHEAT

The effects of hydroxycarbam, a compound belonging to the cartolin cla ss, on wheat (Triticum aestivum L.) frost resistance were studied. See d or plant treatments with hydroxycarbam resulted in alterations in th e chloroplast ultrastructure. The number of thylakoids, plastoglobules , and starch grains increased. These alterations were more pronounced than those produced by cold acclimation of winter cereals at near-zero temperatures. Hydroxycarbam was found to promote wheat frost resistan ce. The most efficient treatment was the presowing seed incrustation w ith hydroxycarbam at a rate of 0.5 kg of the actual substance per ton.