Studying the cold resistance of varieties of sugar corn

The article discusses the results of a studying the resistance to suboptimal temperatures of sweet corn varieties in laboratory and field conditions on the basis of the Federal State Budget-ary Institution RosNIISK "Rossorgo". For the laboratory experiment, the roll method of cold germination (coldtest) modified by N.I. Kiyashko was used. During the studying, it was revealed that none of the studied samples is cold tolerant. High germination rates (>80%) were found in genotypes: k-3151, k-4475, k-103, k-4456, k-13807, Zabava, Zukerka, Zabava/Delight. These samples can be considered resistant to suboptimal temperatures. The measurements of the length of the seedlings and the counting of the lateral roots were carried out in the experiment and in the control. It was found that, on average, the length of sprouts and roots decreased by 56.3 and 47.1%, respectively. Prolonged exposure to cold on the Zabava genotype had practically no ef-fect on the activation of the growth processes of roots and green mass. In most of the studied samples, the effect of suboptimal temperatures contributed to the growth of lateral roots. A genotype with a high germination rate in laboratory and field conditions was revealed - k-4456. Samples k-103 (I1), Zabava, Zabava/Uslada, which were recorded as cold-resistant in laboratory conditions, were classified as medium-resistant in the field. A significant correlation was also established between the germination of test samples and the preservation of germination (r=0.91). There was no relationship between the other studied features. Keywords: SUGAR CORN, POTENTIAL COLD RESISTANCE, COLD RESISTANCE, LABORATO-RY GENERATION, GENERATION RESERVATION, CORRELATION