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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">Biology Bulletin</journal-id><journal-title-group><journal-title xml:lang="en">Biology Bulletin</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Российской академии наук. Серия биологическая</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1026-3470</issn><issn publication-format="electronic">3034-5367</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">647778</article-id><article-id pub-id-type="doi">10.31857/S1026347024050018</article-id><article-id pub-id-type="edn">ulyulg</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>DEVELOPMENTAL BIOLOGY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>БИОЛОГИЯ РАЗВИТИЯ</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 content of endogenous hormones in explants and calluses of <italic>Lavandula angustifolia</italic> Mill. at the initial stages of <italic>in vitro</italic> culture</article-title><trans-title-group xml:lang="ru"><trans-title>Содержание эндогенных гормонов в эксплантах и каллусах <italic>lavandula angustifolia</italic> mill. На начальных этапах культивирования <italic>in vitro</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kruglova</surname><given-names>N. N.</given-names></name><name xml:lang="ru"><surname>Круглова</surname><given-names>Н. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kruglova@anrb.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Galin</surname><given-names>I. R.</given-names></name><name xml:lang="ru"><surname>Галин</surname><given-names>И. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kruglova@anrb.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yegorova</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Егорова</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kruglova@anrb.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Institute of Agriculture of Crimea</institution></aff><aff><institution xml:lang="ru">НИИ сельского хозяйства Крыма</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ufa Institute of biology – subdivision of the UFRC RAS</institution></aff><aff><institution xml:lang="ru">Уфимский Институт биологии – обособленное структурное подразделение УФИЦ РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-23" publication-format="electronic"><day>23</day><month>12</month><year>2024</year></pub-date><issue>5</issue><fpage>551</fpage><lpage>561</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</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://medjrf.com/1026-3470/article/view/647778">https://medjrf.com/1026-3470/article/view/647778</self-uri><abstract xml:lang="en"><p>The content of endogenous hormones (auxin IAA, cytokinines, ABA) in explants of various types (segments of leaf, bud, stem), primary calluses induced from them, as well as morphogenic and non-morphogenic calluses at the initial stages of in vitro culture by the immunoassay method was studied for the first time for <italic>Lavandula</italic> angustifolia Mill. The maximum value of hormone levels in such explants as segments of bud was shown. An increase in the content of hormones in primary calluses was revealed in comparison with similar characteristics in all types of explants. The higher level of the active form of cytokinin (trans-zeatin) and ABA, as well as the lower level of the inactive form of cytokinin (zeatin-nucleotide) and auxin IAA were identified in morphogenic callus compared with non-morphogenic callus. It is suggested that the content of endogenous hormones in explants and calluses of <italic>L</italic><italic>. </italic><italic>angustifolia</italic><italic> </italic>is due to their histological status. The conclusion is made about the unified histophysiological mechanisms of callusogenesis and morphogenesis <italic>in</italic><italic> </italic><italic>vitro</italic> in the studied plant.</p></abstract><trans-abstract xml:lang="ru"><p>Методом иммуноферментного анализа впервые для <italic>Lavandula</italic><italic> </italic><italic>angustifolia</italic> Mill. изучено содержание эндогенных гормонов (ауксин ИУК, цитокинины, АБК) в эксплантах различных типов (сегменты листа, почки, стебля), индуцированных из них первичных каллусах, а также морфогенных и неморфогенных каллусах на начальных этапах культивирования<italic> </italic><italic>in</italic><italic> </italic><italic>vitro</italic>. Показано максимальное значение уровней гормонов в таких эксплантах, как сегменты почек. Выявлено повышение содержания гормонов в первичных каллусах в сравнении с аналогичными показателями во всех типах эксплантов. В морфогенных каллусах в сравнении с неморфогенными отмечен более высокий уровень активной формы цитокинина (транс-зеатин) и АБК, а также более низкий уровень неактивной формы цитокинина (зеатин-нуклеотид) и ауксина ИУК. Высказано мнение о том, что содержание эндогенных гормонов в эксплантах и каллусах <italic>L</italic><italic>. </italic><italic>angustifolia</italic> обусловлено их гистологическим статусом. Сделан вывод о единых гистофизиологических механизмах каллусо- и морфогенеза <italic>in</italic> <italic>vitro</italic> у изученного растения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>callus in vitro</kwd><kwd>morphogenesis</kwd><kwd>auxin</kwd><kwd>cytokinin</kwd><kwd>abscisic acid</kwd><kwd>Lavandula angustifolia Mill</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>каллус in vitro</kwd><kwd>морфогенез</kwd><kwd>ауксины</kwd><kwd>цитокинины</kwd><kwd>абсцизовая кислота</kwd><kwd>лаванда узколистная Lavandula angustifolia Mill</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд (грант)</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation (grant)</institution></institution-wrap></funding-source><award-id>23-24-00023</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Егорова Н. 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