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Green cutting propagation technologies of seabuckthorn ( Hippophae rhamnoides L.) are well developed and highly effective under optimal parameters of implementation. Differences in root development in most cases are connected with varietal specificity. In conditions of uncovered greenhouses, weather particularities can influence significantly on development of cuttings. Hence, the aim of investigation was to study the cultivar difference in root development of seabuckthorn green cuttings in a long-term industrial-scale experiment in conditions of uncovered greenhouse facilities. The experiments were carried out in forest-steppe area of Altai krai in 2018-2021. Seventeen seabuckthorn cultivars developed by Federal Altai Scientific Center of Agrobiotechnologies were taken as research objects. Significant varietal specificity of rooting ability of green cuttings has been established. The experiments showed that season particularities just slightly affect this parameter, indicating significant homeostasis of seabuckthorn cultivars in this regard. Altaiskaya, Ognivo, Gnom, Ethna, Elizaveta and Athena varieties showed the highest level of rhizogenesis with everage rooting percentage from 91.2 to 95.5 %. Group of low rooted cultivars included Azhurnaya, Aurelia, Zlata, Sudarushka and Avgustina with rooting percentage from 70.5 to 79.7 %. Other cultivars showed intermediate figures. High correlation level (0.590.21) was shown between total root quality and rhizogenesis ability. Cultivars which demonstrated high rooting percentage also formed high level of first grade seedlings. In this regard, the best cultivars were Altaiskaya, Gnom and Ognivo, which formed 79.1, 82.1 and 83.8 % of first-grade seedlings, respectively. Low rooting ability was observed in cultivars Avgustina, Sudarushka and Zlata, which provided only 55.464.4 % of first-grade planting material. The variation coefficient of seabuckthorn standard seedlings was low and did not exceed 9.7 % for Avgustina cultivar. The variation of seedlings quality was at a higher level - u p to 27.3 % for cv. Sudarushka, however, for the rest of the cultivars it was low or medium and ranged from 2.7 to 18.7 %. According to the results of cluster analysis, the seabuckthorn cultivars were divided into three separate groups - slow-, medium- and fast-to-root genotypes.

Seabuckthorn gene pool in collections of Lisavenko Research Institute of Horticulture for Siberia which is a division of the Federal Altai Scientific Center of Agro-BioTechnologies is represented by more than 14 thousand hybrid seedlings and over 450 varieties under selection. It allows to provide comprehensive selection on different agronomic traits and to achieve permanent assortment improvement. The main aim of the research was to select seabuckthorn varieties distinguished by characteristics that meet the requests of industrial sector with focus on various technological approaches. Seabuckthorn varieties of hybrid origin from crossbreeding of 1993-2005 were studied. The experiments were carried out in forest-steppe zone of Altai Krai in 2016-2020. According to the results of comprehensive evaluation, groups of the most promising varieties were proposed as a source of various agronomic traits. The potential of breeding activity was shown as well as possibility of seabuckthorn assortment improving was proved. In particular, within sweet-fruited varieties such samples as 57-01-1, 146-02-1 and 226-00-1 with sugar-acid index of 6.4, 5.4 and 5.3, respectively, have been selected as well as fruit of 198-99-3a and 62-01-2 varieties weighed about 1.0 g, that is almost 0.3 g higher compared to Chuiskaya variety (control) and Altaiskaya (the sweetest one). Two varieties - 149-00-3 and 664-00-2 - were included to the group with very low tear-off force of fruits - 95 and 110 g, respectively, which was significantly lower compared to the control (Chuiskaya) and the standard variety (Anastasia). That means high suitability of these varieties for harvesting by hand picking. The hybrid 185-99-5 had an average fruit weight of 1.67 g which was two times higher than fruit weight of the control variety. Highly promising red colored variety (258-03-1) had high oil content in fruits. That positions it as an extremely promising variety for seabuckthorn oil concentrate processing. Most of estimated varieties were included in various reference groups demonstrating by that the combination of agronomic traits.