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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vir-nw</journal-id><journal-title-group><journal-title xml:lang="ru">Труды по прикладной ботанике, генетике и селекции</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings on applied botany, genetics and breeding</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2227-8834</issn><issn pub-type="epub">2619-0982</issn><publisher><publisher-name>N.I. Vavilov All-Russian Institute of Plant Genetic Resources</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.30901/2227-8834-2021-3-37-43</article-id><article-id custom-type="elpub" pub-id-type="custom">vir-nw-1027</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ИЗУЧЕНИЕ И ИСПОЛЬЗОВАНИЕ ГЕНЕТИЧЕСКИХ РЕСУРСОВ РАСТЕНИЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>STUDYING AND UTILIZATION OF PLANT GENETIC RESOURCES</subject></subj-group></article-categories><title-group><article-title>Динамика активности пероксидазы и ее изоформ в листьях разных сортов яблони</article-title><trans-title-group xml:lang="en"><trans-title>Dynamics in the activity of peroxidase and its isoforms in leaves of different apple cultivars</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8425-5216</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мишко</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Mishko</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>350901 Россия, г. Краснодар, ул. 40-летия Победы, 39</p></bio><bio xml:lang="en"><p>39 40-letiya Pobedy St., Krasnodar 350901, Russia</p></bio><email xlink:type="simple">mishko-alisa@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0521-0827</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Луцкий</surname><given-names>Е. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Lutskiy</surname><given-names>E. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>350901 Россия, г. Краснодар, ул. 40-летия Победы, 39</p></bio><bio xml:lang="en"><p>39 40-letiya Pobedy St., Krasnodar 350901, Russia</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Северо-Кавказский федеральный научный центр садоводства, виноградарства, виноделия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>North-Caucasian Federal Scientific Center of Horticulture, Viticulture, Wine-making</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>06</day><month>10</month><year>2021</year></pub-date><volume>182</volume><issue>3</issue><fpage>37</fpage><lpage>43</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мишко А.Е., Луцкий Е.О., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Мишко А.Е., Луцкий Е.О.</copyright-holder><copyright-holder xml:lang="en">Mishko A.E., Lutskiy E.O.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://elpub.vir.nw.ru/jour/article/view/1027">https://elpub.vir.nw.ru/jour/article/view/1027</self-uri><abstract><sec><title>Актуальность</title><p>Актуальность. Выявление наиболее устойчивых сортов плодовых культур на определенных территориях произрастания включает различные подходы исследования, в числе которых немалую роль играют физиолого-биохимические показатели. В настоящей работе представлены результаты расчета активности пероксидазы, одного из основных ферментов антиоксидантной системы защиты растений, при естественных изменениях гидротермического режима в летний период, которые были приняты в качестве контрольных условий, и при искусственном воздействии экстремально высоких температур.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Изучены три сорта яблони отечественной селекции ‘Фортуна’, ‘Союз’, ‘Прикубанское’ и сорт ‘Лигол’ польского происхождения. В отобранных листьях в течение летнего периода 2018, 2019 г. определяли активность пероксидазы и ее изоферментный состав в контрольных и стрессовых условиях (при искусственном прогреве листьев). Для разделения пероксидаз на изоформы использовали нативный электрофорез на полиакриламидном геле. Оценку интенсивности развития окислительного стресса в листьях проводили по показателю перекисного окисления липидов, а именно по содержанию малонового диальдегида.</p></sec><sec><title>Результаты</title><p>Результаты. Установлено, что исследованные показатели характеризуются высокой степенью неоднородности, обусловленной как сортовой спецификой, так и изменчивостью погодных условий. Были выделены изоформы пероксидаз с молекулярной массой от 70 до 60 кДа, отличающиеся максимальным уровнем изменчивости – от одной до четырех изоформ. К двум другим группам отнесли изоформы с молекулярной массой ~130–100 кДа (1–3 изоформы) и ~55 кДа (1 изоформа). Наибольшая активность фермента была выявлена в самый жаркий месяц за исследованный период (июль 2018 г.) у сортов ‘Фортуна’ и ‘Союз’, но в лабораторных условиях наименее восприимчивым к воздействию стрессового фактора оказался триплоидный сорт ‘Союз’.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. Various approaches are used for identification of the most resistant fruit crop cultivars, including the analysis of different physiological and biochemical indicators. In Krasnodar Territory, Russia, one of the major stressors in summer is the hydrothermal stress. Drought and heat lead to an oxidative stress, as reactive oxygen species are produced in plant cells. Plants respond to oxidative damage by activating antioxidant enzymes, such as superoxide dismutase, catalase, and various peroxidases. Peroxidase is able to decompose hydrogen peroxide. Peroxidase activity was calculated under natural summertime changes in the hydrothermal pattern (control) and in simulated high-temperature conditions.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Three apple cultivars of Russian breeding, ‘Fortuna’, ‘Soyuz’ and ‘Prikubanskoe’, and cv. ‘Ligol’ of Polish origin were studied. In the summers of 2018–2019, their leaf samples were analyzed to assess peroxidase activity and its isozyme composition under control and stress conditions. Native electrophoresis in polyacrylamide gel was used for separation of peroxidase isoforms. Malondialdehyde content was measured to identify oxidative stress levels in apple leaves.</p></sec><sec><title>Results</title><p>Results. The tested indicators demonstrated a high degree of heterogeneity induced by both cultivar specificity and seasonal weather dynamics. Peroxidase isoforms with a molecular weight of 70 to 60 kDa, characterized by the maximum level of variability (1–4 isoforms), were isolated. Two other groups included 1–3 isoforms with a molecular weight of ~130–100 kDa, and one with a molecular weight of ~55 kDa. The highest enzyme activity was found in cvs. ‘Fortuna’ and ‘Soyuz’ in July 2018, the hottest month during the period of research. Under simulated conditions, the triploid cultivar ‘Soyuz’ was least susceptible to the stress impact.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>плодовая культура</kwd><kwd>ферменты антиоксидантной системы защиты</kwd><kwd>устойчивость</kwd><kwd>высокотемпературный стресс</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fruit crop</kwd><kwd>antioxidant enzyme</kwd><kwd>resistance</kwd><kwd>high-temperature stress</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках Государственной программы № 0689-2019-0003 Министерства науки и высшего образования РФ.</funding-statement><funding-statement xml:lang="en">The research was implemented within the framework of the State Program of the Ministry of Science and Higher Education of the Russian Federation, No. 0689-2019-0003.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Андреева В.А. 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