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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">sibvest</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский вестник сельскохозяйственной науки</journal-title><trans-title-group xml:lang="en"><trans-title>Siberian Herald of Agricultural Science</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0370-8799</issn><issn pub-type="epub">2658-462X</issn><publisher><publisher-name>Siberian Federal Scientific Centre of Agro-BioTechnologies of the Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26898/0370-8799-2025-2-1</article-id><article-id custom-type="elpub" pub-id-type="custom">sibvest-2192</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>РАСТЕНИЕВОДСТВО И СЕЛЕКЦИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PLANT GROWING AND BREEDING</subject></subj-group></article-categories><title-group><article-title>Фотосинтетическая активность листьев и продуктивность раннеспелого гибрида кукурузы Дорка в условиях Северного Нечерноземья</article-title><trans-title-group xml:lang="en"><trans-title>Photosynthetic activity of the leaves and productivity of the early-maturing corn hybrid Dorka in the conditions of the northern Non-Chernozem Zone</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7993-9541</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Головко</surname><given-names>Т. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Golovko</surname><given-names>T. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>главный научный сотрудник, доктор биологических наук, профессор</p><p>167982, Сыктывкар, ул. Коммунистическая, 28</p></bio><bio xml:lang="en"><p>Head Researcher, Doctor of Science in Biology, Professor</p><p>28, Kommunisticheskaya St., Syktyvkar, 167982</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1147-2746</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Табаленкова</surname><given-names>Г. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Tabalenkova</surname><given-names>G. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ведущий научный сотрудник, доктор биологических наук, доцент</p><p>Сыктывкар</p></bio><bio xml:lang="en"><p>Lead Researcher, Doctor of Science in Biology, Associate Professor</p><p>Syktyvkar</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6716-6118</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Малышев</surname><given-names>Р. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Malyshev</surname><given-names>R. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>научный сотрудник, кандидат биологических наук</p><p>Сыктывкар</p></bio><bio xml:lang="en"><p>Ruslan V. Malyshev, Researcher, Candidate of Science in Biology</p><p>Syktyvkar</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9632-3431</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Силина</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Silina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>младший научный сотрудник, кандидат биологических наук</p><p>Сыктывкар</p></bio><bio xml:lang="en"><p>Ekaterina V. Silina, Junior Researcher, Candidate of Science in Biology</p><p>Syktyvkar</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт биологии Коми научного центра Уральского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Biology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>08</day><month>09</month><year>2025</year></pub-date><volume>55</volume><issue>2</issue><fpage>5</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Головко Т.К., Табаленкова Г.Н., Малышев Р.В., Силина Е.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Головко Т.К., Табаленкова Г.Н., Малышев Р.В., Силина Е.В.</copyright-holder><copyright-holder xml:lang="en">Golovko T.K., Tabalenkova G.N., Malyshev R.V., Silina E.V.</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://sibvest.elpub.ru/jour/article/view/2192">https://sibvest.elpub.ru/jour/article/view/2192</self-uri><abstract><p>Работа посвящена изучению фотосинтетической активности и последействия низкой положительной температуры на СО2-газообмен листьев в связи с продуктивностью раннеспелого гибрида кукурузы Дорка в центральном агроклиматическом районе Республики Коми (61°40′ с. ш. 50°49′ в. д.). Опыты проводили в типичный по погодным условиям сезон вегетации на участке со среднеокультуренной подзолистой почвой. Семена высевали в середине июня ручным способом в гряды. К уборке (I декада сентября) сырая масса надземной части растений составляла около 690 г. Основная часть биомассы (около 80%) была представлена стеблями с влагалищами листьев, початки отсутствовали. Средняя за три года урожайность зеленой массы составила 355 ц/га. Установлено, что независимо от возраста растений фотосинтетическая активность листьев возрастает с увеличением освещенности. При интенсивности фотосинтетически активной радиации, близкой к полной солнечной, и температуре 20 оС скорость нетто-фотосинтеза листьев верхнего яруса молодых растений кукурузы составляла около 14 мкмоль СО2/м2с, у зрелых растений этот показатель не превышал 8 мкмоль СО2/м2с. Выдерживание молодых растений (фаза 4–5 листьев) в холодной камере при 6 ºС в течение 7 ч слабо влияло на фотосинтез, но снижало дыхание листьев. Увеличение экспозиции до 12 ч привело к развитию признаков окислительного стресса и подавлению ассимиляции на 40%. Полученные данные дополняют эколого-биологическую характеристику изучаемого гибрида кукурузы. Результаты исследований показывают, что сравнительно низкая ассимиляционная активность и чувствительность СО2-газообмена к снижению температуры ограничивают реализацию фотосинтетического потенциала продуктивности гибрида кукурузы Дорка в холодном климате. </p></abstract><trans-abstract xml:lang="en"><p>The paper is devoted to the study of photosynthetic activity and aftereffect of low positive temperature on CO2-gas exchange of the leaves in connection with the productivity of early maturing corn hybrid Dorka in the central agroclimatic region of the Komi Republic (61°40′ N, 50°49′ E). The experiments were conducted in a typical growing season in a plot with a medium-cultivated podzolic soil. The seeds were sown in mid-June by hand in the ridges. By harvesting (I ten-day period of September), the raw weight of the above-ground part of the plants was about 690 g. The main part of the biomass (about 80%) was represented by stems with leaf sheaths, the cobs were absent. The three-year average yield of the green mass amounted to 355 c/ha. It was found that regardless of the age of the plants photosynthetic activity of the leaves increases with increasing illumination. At the intensity of photosynthetically active radiation close to full solar radiation and temperature 20 oC, the net photosynthesis rate of the upper tier leaves of young corn plants was about 14 μmol CO2/m2s, in mature plants this index did not exceed 8 μmol CO2/m2s. Keeping young plants (phase of 4–5 leaves) in a cold chamber at 6 ºC for 7 h had little effect on photosynthesis, but reduced leaf respiration. Increasing the exposure to 12 h resulted in the development of the signs of oxidative stress and suppression of assimilation by 40%. The obtained data complete the ecological and biological characterization of the studied corn hybrid. The results of the research show that relatively low assimilatory activity and sensitivity of CO2 gas exchange to temperature decrease restrain the realization of photosynthetic productivity potential of corn hybrid Dorka in cold climate.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>СО2-газообмен</kwd><kwd>температура</kwd><kwd>окислительный стресс</kwd><kwd>продуктивность</kwd><kwd>кукуруза</kwd><kwd>холодный климат</kwd></kwd-group><kwd-group xml:lang="en"><kwd>CO2-gas exchange</kwd><kwd>temperature</kwd><kwd>oxidative stress</kwd><kwd>productivity</kwd><kwd>corn</kwd><kwd>cold climаte</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out within the framework of the theme of state-funded Research and Technological Development "Photosynthesis, respiration and bio-energetics of plants and phototrophic organisms (physiological, biochemical, molecular-genetic and environmental aspects)" (No. 122040600021-4).</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">Liu D., Jia Q., Li J., Zhang P., Ren X., Jia Z. 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