FIELD: chemistry.SUBSTANCE: invention relates to the field of biochemistry, in particular to a method of increasing biomass or improvement of cell proliferation, leaf development and/or reproductive development of a plant, which includes increasing expression in the plant of nucleic acid, coding the ubiquitin-specific protease, as well as to the plant, a part of the plant and a seed of the plant, biomass of which is increased, or cell proliferation, leaf development and/or reproductive development of which are increased by the said method. A vector for application in the method of obtaining plants with increased biomass or improved cell proliferation, leaf development and/or reproductive development, as well as the plant and the part of the plant, transformed with the said vector, are described. Application of nucleic acid, coding the ubiquitin-specific protease is disclosed. Also disclosed is a method of obtaining a transgenic plant with increased biomass or improved cell proliferation, leaf development and/or reproductive development, as well as the transgenic plant with increased biomass or improved cell proliferation, leaf development and/or reproductive development in comparison with the control plants, obtained as a result of increased expression of nucleic acid, coding the ubiquitin-specific protease.EFFECT: invention makes it possible to efficiently obtain the plant with increased biomass or improved cell proliferation, leaf development and/or reproductive development.17 cl, 11 dwg, 3 tbl, 28 exИзобретение относится к области биохимии, в частности к способу увеличения биомассы или улучшения пролиферации клеток, развития листа и/или репродуктивного развития растения, содержащему увеличение в растении экспрессии нуклеиновой кислоты, кодирующей Убиквитин-Специфичную Протеазу, а также к растению, части растения и семени растения, биомасса которых увеличена или пролиферация клеток, развитие листа и/или репродуктивное развитие которых улучшены указанным способом
