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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.47612/0514-7506-2023-90-1-67-73</article-id><article-id custom-type="elpub" pub-id-type="custom">zhps-1123</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Нефотохимическое тушение флуоресценции хлорофилла а как индикатор состояния фотосинтетического аппарата растений при абиотическом стрессе</article-title><trans-title-group xml:lang="en"><trans-title>Non-Photochemical Quenching of Chlorophyll a Fluorescence as an Indicator of the State of a Plant Photosynthetic Apparatus under Abiotic Stress</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3634-1889</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пшибытко</surname><given-names>Н. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Pshybytko</surname><given-names>N. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра клеточной биологии и биоинженерии растений, зам. декана биологического факультета БГУ,</p><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">pshybytko@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>01</day><month>12</month><year>2022</year></pub-date><volume>90</volume><issue>1</issue><fpage>67</fpage><lpage>73</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Пшибытко Н.Л., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Пшибытко Н.Л.</copyright-holder><copyright-holder xml:lang="en">Pshybytko N.L.</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://zhps.ejournal.by/jour/article/view/1123">https://zhps.ejournal.by/jour/article/view/1123</self-uri><abstract><p>Исследованы параметры флуоресценции хлорофилла а (Хл а) первых листьев семидневных проростков ячменя при воздействии повышенной температуры (40 °С, 3 ч) и водного дефицита (45 ч на 3 % растворе ПЭГ 6000). Показано, что потенциальный и эффективный квантовые выходы фотохимических реакций фотосистемы 2, коэффициенты фотохимического (qP) и нефотохимического (qN) тушения флуоресценции Хл а существенно не изменяются при воздействии данных стрессовых факторов. Высокая стрессочувствительность обнаружена для коэффициента энергозависимого тушения флуоресценции Хл а (qE), линейно связанного с градиентом Н+ на тилакоидной мембране. Поскольку qE является интегральным показателем, зависящим от функционирования световой и темновой стадий фотосинтеза, данный параметр предложено использовать в качестве маркера стрессового состояния у растений на ранних стадиях. </p></abstract><trans-abstract xml:lang="en"><p>The parameters of chlorophyll a (Chl a) fluorescence of the primary leaves of 7-day-old barley seedlings under the impact of elevated temperature (40°C, 3 h) and water deficit (45 h in 3% PEG 6000) were studied. It was shown that the potential and effective quantum yields of photochemical reactions of photosystem II, the photochemical (qP) and non-photochemical (qN) quenching of Chl a fluorescence did not change significantly under these stress factors. High stress sensitivity was found for the coefficient of energydependent quenching of Chl a fluorescence (qE), related linearly with the magnitude of the H+ gradient across the thylakoid membrane. Since the qE value is an integral indicator dependent on the light and dark photosynthetic reaction, it is proposed to use this parameter as a marker of the stress state in the photosynthetic apparatus. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>флуоресценция хлорофилла а</kwd><kwd>нефотохимическое тушение</kwd><kwd>проростки Hordeum vulgare</kwd><kwd>повышенная температура</kwd><kwd>обезвоживание</kwd></kwd-group><kwd-group xml:lang="en"><kwd>chlorophyll a fluorescence</kwd><kwd>non-photochemical quenching</kwd><kwd>Hordeum vulgare</kwd><kwd>elevated temperature</kwd><kwd>dehydration</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">B. Nowicka, J. Ciura, R. Szymanska, J. Kruk. J. Plant. Physiol., 231 (2018) 415—433</mixed-citation><mixed-citation xml:lang="en">B. Nowicka, J. Ciura, R. Szymanska, J. Kruk. J. 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