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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">Radiation biology. Radioecology</journal-id><journal-title-group><journal-title xml:lang="en">Radiation biology. Radioecology</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиационная биология. Радиоэкология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8031</issn><issn publication-format="electronic">3034-5898</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">697404</article-id><article-id pub-id-type="doi">10.31857/S0869803125030033</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Radiobiology of Plants</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Радиобиология растений</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">The Effect of Gamma Radiation on the Mitotic Index and Root Growth Endpoints of <italic>Allium Cepa</italic> Seedlings in Long-Term Experiments</article-title><trans-title-group xml:lang="ru"><trans-title>Действие гамма-излучения на митотический индекс и рост корней проростков <italic>Allium cepa</italic> в экспериментах разной длительности</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7511-4916</contrib-id><name-alternatives><name xml:lang="en"><surname>Trofimova</surname><given-names>E. A</given-names></name><name xml:lang="ru"><surname>Трофимова</surname><given-names>Е. А</given-names></name></name-alternatives><bio xml:lang="en"><p>junior researcher, radioecology laboratory,</p></bio><bio xml:lang="ru"><p>м. н. с. лаборатории радиоэкологии</p></bio><email>e.trofimova11@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="researcherid">P‑8028-2015</contrib-id><name-alternatives><name xml:lang="en"><surname>Bolsunovsky</surname><given-names>A. Ya</given-names></name><name xml:lang="ru"><surname>Болсуновский</surname><given-names>А. Я</given-names></name></name-alternatives><bio xml:lang="en"><p>Dr. Sc. (Biology), head of radioecology laboratory</p></bio><bio xml:lang="ru"><p>доктор биологических наук, зав. лабораторией радиоэкологии</p></bio><email>radecol@ibp.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7016-8592</contrib-id><name-alternatives><name xml:lang="en"><surname>Dementyev</surname><given-names>D. V</given-names></name><name xml:lang="ru"><surname>Дементьев</surname><given-names>Д. В</given-names></name></name-alternatives><bio xml:lang="en"><p>senior researcher radioecology laboratory</p></bio><bio xml:lang="ru"><p>к. б. н., с. н. с. лаборатории радиоэкологии</p></bio><email>dementyev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4125-3798</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrichenkov</surname><given-names>M. V</given-names></name><name xml:lang="ru"><surname>Петриченков</surname><given-names>М. В</given-names></name></name-alternatives><bio xml:lang="en"><p>is the head of the department for Radiation Research and Radiation Safety</p></bio><bio xml:lang="ru"><p>начальник Отдела радиационных исследований и радиационной безопасности</p></bio><email>petrmv@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS"</institution></aff><aff><institution xml:lang="ru">Институт биофизики Федерального исследовательского центра "Красноярский научный центр Сибирского отделения Российской академии наук"</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Budker Institute of Nuclear Physics of the Siberian Branch of the RAS</institution></aff><aff><institution xml:lang="ru">Институт ядерной физики им. Г.И. Будкера Сибирского отделения Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2025</year></pub-date><volume>65</volume><issue>3</issue><issue-title xml:lang="en">VOL 65, NO3 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 65, №3 (2025)</issue-title><fpage>272</fpage><lpage>287</lpage><history><date date-type="received" iso-8601-date="2025-12-02"><day>02</day><month>12</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><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-06-15"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-8031/article/view/697404">https://journals.eco-vector.com/0869-8031/article/view/697404</self-uri><abstract xml:lang="en"><p>The effect of γ-radiation including low doses on the mitotic index and root growth endpoints of <italic>Allium cepa</italic> (L.) seedlings in different intervals of the recovery time after irradiation were studied. Onion seedlings were irradiated with <sup>137</sup>Cs point γ-sources of various activity, including radioactive microparticles of the Yenisei River floodplain. According to the results of 7 experiments, the inhibitory effect of γ-irradiation on onion root growth was observed in the dose range from 0.1 to 21 Gy in the time interval of the recovery period of up to 6 days, by the 10th day the damaging effect of γ-irradiation persisted mainly at absorbed doses of 5.2 Gy. A detailed examination of root growth inhibition in the time interval from 1 to 6 days of the experiment allowed us to determine that a sharp inhibition of root growth began on day 4 at absorbed doses of 2.5–10.7 Gy, and at the same time a decrease in proliferative activity in the apical meristem of the root was observed. The results of a factor analysis of the experiment on the dynamics of inhibition of primary root length and mitotic index after irradiation are presented.</p></abstract><trans-abstract xml:lang="ru"><p>Исследовали влияние γ-излучения, в том числе в малых дозах, на митотический индекс и рост корней проростков <italic>Allium cepa</italic> (L.) в разные интервалы восстановительного периода после облучения. Проростки лука облучали точечными γ-источниками <sup>137</sup>Cs различной активности, в том числе радиоактивными микрочастицами из поймы реки Енисей. По результатам 7 экспериментов, ингибирующий эффект γ-облучения на рост корней лука наблюдался в диапазоне доз от 0.1 до 21 Гр во временном интервале восстановительного периода до 6 суток, к 10-м суткам повреждающее действие γ-облучения сохранялось в основном при поглощенных дозах от 5.2 Гр. Детальное рассмотрение ингибирования роста корня во временном интервале с 1-х по 6-е сутки эксперимента позволило установить, что резкое угнетение роста корней начиналось с 4-х суток при поглощенных дозах 2.5–10.7 Гр и при этом параллельно наблюдалось падение пролиферативной активности в апикальной мернстеме корня. Приведены результаты факторного анализа эксперимента по динамике ингибирования длины первичного корня и митотического индекса после облучения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Allium-test</kwd><kwd>γ-radiation</kwd><kwd>low doses</kwd><kwd>recovery time</kwd><kwd>growth processes</kwd><kwd>mitotic index</kwd><kwd>dose dependence</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Allium-тест</kwd><kwd>γ-облучение</kwd><kwd>малые дозы</kwd><kwd>период восстановления</kwd><kwd>ростовые процессы</kwd><kwd>митотический индекс</kwd><kwd>дозовые зависимости</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена частично за счет средств гранта Российского научного фонда № 24-27-20003, Красноярского краевого научного фонда</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Duarte G.T., Volkova P. Yu., Perez F.F., Horemans N. 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