The traditional production of linear material  and hybrids in the selection of red beet is a time-consuming,  long-term process due to the two -  year cycle of plant development, self-and cross-incompatibility,  inbred depression. Significantly  reduce the life cycle of the plant allows the vernalization  at different stages  of  development, including during  the  "steckling". Cultivation  of plants with the use of steckling culture in the selection of red beet has not yet found wide application and has not been studied enough, in this regard, in 2009-2018 on the basis of the Federal  State Budgetary  Scientific Institution “Federal Scientific Vegetable Center”. The material of the study was inbred offspring I1-5, which were studied in several series of independent  experiments using different schemes of growing stecklings and roots (one-year and biennial  cycles).  It is shown that the use of culture of steckling and protected ground for breeding schemes to create lines of red beet is advisable, as it accelerates the  process of  evaluating the  heterogeneity of inbred progenies for earliness, index, root, the manifestation of cytoplasmic  sterility, and also allows you to get a wider range of different  inbred forms due to the high variability  in the offspring. The probability of a valuable fully-sterile ms-forms  higher in the group of early maturing plants with a large mass stecklings and promising self-compatibility  mf-lines - among small fractions of mid and late inbred offspring. The continuous use of steckling culture should be recommended only for the preliminary evaluation  of breeding  material on sign of cytoplasmic sterility, followed by the reproduction of selected promising inbred offspring in the open field ("halves method"),  and at later stages of  the breeding process as a  rapid assessment of crossing combinations on sign of cytoplasmic sterility when checking mf-forms on the fixing ability. The alternation  of the culture of stecklings with the traditional biennial cycle of culture in conjunction with the techniques of recurrent selection and use of different backgrounds  (field, greenhouse),  can improve the performance of the selection and get aligned according to the main economic-important  signs of promising inbred offspring in a shorter period of time.

Experimental data of two years study of the factors that influence on the plant sex of «zucchini» aimed at rais ing the level of hybridity for industrial hybrid seed pro duction are shown. Seeds vernalization and treatment by preparations containing 2 chloroethylphosphonic acid were used to increase the number of female flow ers on the parent plants. The exposure to silver nitrate and gibberellin on the paternal lines increased the number of male flowers.

Relevance. The technology of producing cabbage seeds with the traditional method takes almost 2 years. Its high labor intensity caused the need to search for cheaper methods of selection and seed production. One of the ways to speed up the stages of the selection process is the use of artificial climate chambers. The aim of research is to obtain seeds of promising inbred lines of late maturing white cabbage and hybrid combinations with their participation using rosette plants (steckling) in artificial climate chambers. Materials and Methods. The material was inbred pure lines of 5-6 generations of inbreeding, obtained from promising hybrid combinations of domestic and foreign breeding. The research was conducted in 2023-2024. Sowing in Plantek 64 cassettes was carried out on July 10, then the seedlings were transplanted into vegetative vessels with an optimal volume of 5-6 liters and installed in the open ground for the growth of a leaf outlet. In the phase 10-13 of real leaves, the plugs were placed in an artificial climate chamber. During the growth and development period, biometric and phenological observations were carried out, and an analysis of seed setting was carried out during the hybridization of inbred lines.Results. As a result of research in the study of hybrid seed production under artificial climate chamber conditions, high rates of seed setting in buds under cross-pollination of rosette plants of white cabbage were revealed. Genotypes with high seed set rate under geitenogamous bud pollination were also identified. The weight of 1000 seeds of the studied plants was within the range of 2.5-5.14 g. Genotypes 383-3, 384-2 and 384-7 were selected, which had the highest percentage of seeds in the fractional composition with size more than 2 mm 80.3%, 43.5% and 59.4%, respectively. When genotypes 384-2 and 384-7 were used in hybrid combinations as a maternal component, high quality indicators of the obtained seeds were revealed.Conclusion. For the studied genotypes of white cabbage, when grown in an artificial climate chamber, no significant effect on seed quality was found; the genotype had a greater effect on seed quality indicators.