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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">Advances in Chemical Physics</journal-id><journal-title-group><journal-title xml:lang="en">Advances in Chemical Physics</journal-title><trans-title-group xml:lang="ru"><trans-title>Физиология растений</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0015-3303</issn><issn publication-format="electronic">3034-624X</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">130217</article-id><article-id pub-id-type="doi">10.31857/S0015330322600772</article-id><article-id pub-id-type="edn">IBUSDD</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ЭКСПЕРИМЕНТАЛЬНЫЕ 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">The effect of low temperature and nitrogen starvation on the morphological and physiological characteristics of two strains of green microalgae of the genus <italic>Lobosphaera</italic> sp.</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние низкой температуры и азотного голодания на морфо-физиологические характеристики двух штаммов зеленых микроводорослей рода <italic>Lobosphaera</italic> sp. (<italic>Chlorophyta</italic>, <italic>Trebouxiophyceae</italic>)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shibzukhova</surname><given-names>Karina A.</given-names></name><name xml:lang="ru"><surname>Шибзухова</surname><given-names>К. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shibzuhovaKA@my.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chivkunova</surname><given-names>Olga B.</given-names></name><name xml:lang="ru"><surname>Чивкунова</surname><given-names>О. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shibzuhovaKA@my.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lobakova</surname><given-names>Elena S.</given-names></name><name xml:lang="ru"><surname>Лобакова</surname><given-names>Е. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shibzuhovaKA@my.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени. М.В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-05-01" publication-format="electronic"><day>01</day><month>05</month><year>2023</year></pub-date><volume>70</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>301</fpage><lpage>310</lpage><history><date date-type="received" iso-8601-date="2023-08-21"><day>21</day><month>08</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, К.А. Шибзухова, О.Б. Чивкунова, Е.С. Лобакова</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, К.А. Шибзухова, О.Б. Чивкунова, Е.С. Лобакова</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">К.А. Шибзухова, О.Б. Чивкунова, Е.С. Лобакова</copyright-holder><copyright-holder xml:lang="ru">К.А. Шибзухова, О.Б. Чивкунова, Е.С. Лобакова</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journals.rcsi.science/0015-3303/article/view/130217">https://journals.rcsi.science/0015-3303/article/view/130217</self-uri><abstract xml:lang="en"><p>The effect of nitrogen starvation and, for the first time, low temperature, as well as their simultaneouseffect, on the physiology and ultrastructure of cells of microalgae of the genus <italic>Lobosphaera</italic> (<italic>Chlorophyta</italic>, <italic>Trebouxiophyceae</italic>) was studied. Nitrogen deficiency in both strains led to a decrease in the content ofchlorophyll by three times and an increase in the proportion of carotenoids by two times. A decrease in thecontent of both chlorophyll and carotenoids was observed at +10°C. The simultaneous effect of two factorsresulted in a threefold decrease in the chlorophyll content in NAMSU 924/2 and a sixfold decrease inNAMSU (CALU) 1497; the proportion of carotenoids in both strains decreased by 1.5–2 times. Data onultrastructural changes in cells of microalgae of the genus <italic>Lobosphaera</italic> under the influence of stress factorshave been obtained. A similar nature of the response in both strains to stress conditions was noted. Nitrogendeficiency led to the accumulation of numerous lipid droplets in the cytoplasm of cells along the cell wall. Long-term incubation on a nitrogen-free medium led to the filling of the entire volume of cells with lipiddroplets, disassembly of the membrane system of chloroplasts, that reduction in sizeand being locatedbetween densely lying lipid droplets. At low temperatures, the number of thylakoids decreased, while theinterthylakoid space and the size of chloroplasts increased. With simultaneous exposure to nitrogen starvation and low temperature, numerous lipid droplets accumulated, the number of thylakoids decreased, the interthylakoid space and the size of the chloroplast increased, which was noted under separate exposure to stress factors. The pyrenoid in both strains did not undergo significant changes in all cases.</p></abstract><trans-abstract xml:lang="ru"><p>Впервые изучено одновременное воздействие азотного голодания и температурного шока на физиологию и ультраструктуру клеток двух штаммов микроводорослей рода <italic>Lobosphaera</italic> (<italic>Chlorophyta</italic>, <italic>Trebouxiophyceae</italic>) – NAMSU 924/2 и NAMSU (CALU) 1497. Дефицит азота у обоих штаммов приводил к снижению содержания хлорофилла в 3 раза и увеличению доли каротиноидов в 2 раза. При температуре +10°С наблюдалось снижение содержания как хлорофилла, так и каротиноидов. Одновременное воздействие двух факторов проявлялось в снижении содержания хлорофилла в 3 раза у NAMSU 924/2, и в 6 раз – у NAMSU (CALU) 1497, доля каротиноидов у обоих штаммов уменьшалась в 1.5–2 раза. Получены данные по ультраструктурным изменениям клеток микроводорослей рода <italic>Lobosphaera</italic> при воздействии стрессовых факторов. Отмечен сходный характер ответа у обоих штаммов на стрессовые условия. Дефицит азота приводил к накоплению в цитоплазме клеток вдоль клеточной стенки многочисленных липидных глобул. Длительная инкубация на безазотной среде приводила к заполнению всего объема клеток липидными глобулами, разборке мембранной системы хлоропластов, их уменьшению в размерах, располагаясь между плотно лежащими липидными глобулами. При низкой температуре уменьшалось число тилакоидов, увеличивались межтилакоидное пространство и размеры хлоропластов. При одновременном воздействии азотного голодания и низкой температуры накапливались многочисленные липидные глобулы, уменьшалось число тилакоидов, увеличивались межтилакоидное пространство и размер хлоропластов, отмеченные при отдельном воздействии стрессовых факторов. Пиреноид у обоих штаммов во всех случаях не претерпевал существенных изменений.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Lobosphaera</kwd><kwd>nitrogen starvation</kwd><kwd>fatty acids</kwd><kwd>microalgae</kwd><kwd>low temperatures</kwd><kwd>pigments</kwd><kwd>stress factors</kwd><kwd>ultrastructure</kwd><kwd>physiology</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Lobosphaera</kwd><kwd>азотное голодание</kwd><kwd>жирные кислоты</kwd><kwd>микроводоросли</kwd><kwd>низкие температуры</kwd><kwd>пигменты</kwd><kwd>стрессовые факторы</kwd><kwd>ультраструктура</kwd><kwd>физиология</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Borowitzka M.A. Microalgae for aquaculture: opportunities and constraints // J. Appl. Phycol. 1997. V. 9. P. 393. https://doi.org/10.1023/A:1007921728300</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Michalak I., Chojnacka K. 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