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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684071</article-id><article-id pub-id-type="doi">10.31857/S2686738925020168</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Physiological effect of 24-epibrassinolide and its conjugate with succinic acid on the resistance of rapeseed plants to chloride salinity</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние 24-эпибрассинолида и его конъюгата с янтарной кислотой на устойчивость растений рапса к хлоридному засолению</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kolomeichuk</surname><given-names>L. V.</given-names></name><name xml:lang="ru"><surname>Коломейчук</surname><given-names>Л. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kolomeychuklv@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Litvinovskaya</surname><given-names>R. P.</given-names></name><name xml:lang="ru"><surname>Литвиновская</surname><given-names>Р. П.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><email>kolomeychuklv@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khripach</surname><given-names>V. А.</given-names></name><name xml:lang="ru"><surname>Хрипач</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><email>kolomeychuklv@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsov</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Кузнецов</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Corresponding Member of the RAS</p></bio><bio xml:lang="ru"><p>член-корреспондент РАН</p></bio><email>kolomeychuklv@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Efimova</surname><given-names>М. V.</given-names></name><name xml:lang="ru"><surname>Ефимова</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kolomeychuklv@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National research Tomsk State University</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Томский государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus</institution></aff><aff><institution xml:lang="ru">Институт биоорганической химии НАН Беларуси</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Timiryazev Institute of Plant Physiology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт физиологии растений им. К.А. Тимирязева Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>521</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>260</fpage><lpage>267</lpage><history><date date-type="received" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-7389/article/view/684071">https://journals.eco-vector.com/2686-7389/article/view/684071</self-uri><abstract xml:lang="en"><p>It has been shown for the first time that exogenous 24-epibrassinolide (EBL) and a conjugate synthesized on its basis, which is 2,3,22,23-tetraester of EBL and succinic acid, at a concentration of 10 nM almost equally mitigate the negative effects of salt stress (150 mM NaCl) on rapeseed plants, maintaining photosynthetic activity and growth parameters. Specificity of the action of the studied compounds in regulating the resistance of rapeseed plants to NaCl is noted. EBL against the background of chloride salinity increases the content of carotenoids, superoxide dismutase and peroxidase activity, while conjugate EBL increases only peroxidase activity. Pretreatment of plants for 4 hours before stress was more effective than the introduction of the studied regulators simultaneously with the stressor.</p></abstract><trans-abstract xml:lang="ru"><p>Впервые показано, что экзогенный 24-эпибрассинолид (ЭБЛ) и синтезированный на его основе конъюгат, представляющий собой 2,3,22,23-тетраэфир ЭБЛ и янтарной кислоты, в концентрации 10 нМ практически в равной степени смягчают негативные последствия солевого стресса (150 мМ NaCl) на растения рапса, поддерживая их фотосинтетическую активность и ростовые параметры. Отмечена специфичность действия исследуемых соединений в регуляции устойчивости растений рапса к NaCl. ЭБЛ на фоне хлоридного засоления повышает содержание каротиноидов, активность супероксиддисмутазы и пероксидазы, в то время как конъюгат ЭБЛ повышает только активность пероксидазы. Предобработка растений в течение 4-х часов перед стрессом была эффективнее, чем внесение исследуемых регуляторов одновременно со стрессором.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Brassica napus</kwd><kwd>brassinosteroids</kwd><kwd>24-epibrassinolide</kwd><kwd>succinic acid</kwd><kwd>conjugate</kwd><kwd>chloride salinity</kwd><kwd>stress</kwd><kwd>enzymatic and non-enzymatic antioxidants</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Brassica napus</kwd><kwd>брассиностероиды</kwd><kwd>24-эпибрассинолид</kwd><kwd>янтарная кислота</kwd><kwd>конъюгат</kwd><kwd>хлоридное засоление</kwd><kwd>стресс</kwd><kwd>ферментативные и неферментативные антиоксиданты</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>23-44-10019</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Белоруссий республиканский фонд фундаментальных исследований</institution></institution-wrap><institution-wrap><institution xml:lang="en">Belarusian Republican Foundation for Fundamental Research</institution></institution-wrap></funding-source><award-id>X23РНФ-087</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Wu, X. 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