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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">RUDN Journal of Agronomy and Animal Industries</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Agronomy and Animal Industries</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Агрономия и животноводство</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-797X</issn><issn publication-format="electronic">2312-7988</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">19954</article-id><article-id pub-id-type="doi">10.22363/2312-797X-2023-18-4-520-530</article-id><article-id pub-id-type="edn">LJLAEU</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Crop production</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Растениеводство</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">Effect of low positive temperature on the antioxidant system formation in de-etiolated and etiolated Amaranthus tricolor L. seedlings grown from seeds treated with growth regulators</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние низкой положительной температуры на формирование антиоксидантной системы световых и этиолированных проростков Amaranthus tricolor L., выращенных из семян, обработанных регуляторами роста</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5685-6305</contrib-id><name-alternatives><name xml:lang="en"><surname>Gins</surname><given-names>Ekaterina M.</given-names></name><name xml:lang="ru"><surname>Гинс</surname><given-names>Екатерина Муратовна</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD student, Junior Researcher</p></bio><bio xml:lang="ru"><p>младший научный сотрудник</p></bio><email>katya.888888@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Russian Potato Research Center</institution></aff><aff><institution xml:lang="ru">Федеральный исследовательский центр картофеля им. А.Г. Лорха</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2023</year></pub-date><volume>18</volume><issue>4</issue><issue-title xml:lang="en">Pesticides. Looking to the future</issue-title><issue-title xml:lang="ru">Пестициды. Взгляд в будущее</issue-title><fpage>520</fpage><lpage>530</lpage><history><date date-type="received" iso-8601-date="2023-12-29"><day>29</day><month>12</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Gins E.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Гинс Е.М.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Gins E.M.</copyright-holder><copyright-holder xml:lang="ru">Гинс Е.М.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://agrojournal.rudn.ru/agronomy/article/view/19954">https://agrojournal.rudn.ru/agronomy/article/view/19954</self-uri><abstract xml:lang="en"><p style="text-align: justify;">In the Non-chernozem zone of Russia, the recurrent spring cold up to 1-2 °C can cause damage and death of thermophilic amaranth seedlings. Pre-sowing treatment of seeds with growth regulators is an inexpensive and effective method to reduce the negative effect of hypothermia on seed germination. The aim of the research was to study the effect of low-temperature stress on etiolated and de-etiolated seedlings of amaranth cv. ‘Valentina’ ( A. tricolor L.) grown from seeds treated with growth stimulants. Seeds were pretreated with aqueous solutions of Albit (1 g/L), hydrogen peroxide (H2O2) - 5 mM and succinic acid (ScA) - 500 mg/L. Seeds were germinated in peat pots at 23 ± 2 °C (T23) for 7 days. On the 7th day, peat pots with seedlings grown in the light and in the dark were moved to thermostat at 2.0 ± 0.5 °C (T2) for 8 hours. Determination of the amount of amaranthine, chlorophylls and carotenoids were carried out according to generally accepted methods. Pretreatment of seeds with the growth regulators Albit, H2O2, and ScA increased hypocotyl length, root length, and biomass of light and etiolated seedlings. Low positive temperatures increased the content of amaranthine and carotenoids but reduced the content of chlorophylls. It was shown that all used growth regulators - H2O2, Albit and ScA trigger or at least maintain the system of antioxidant protection in light and etiolated seedlings of amaranth cv. ‘Valentina’ under low positive temperatures.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">В Нечерноземной зоне России возвратные весенние холода до 1-2 °C могут вызвать повреждения и гибель проростков теплолюбивого растения - амаранта. Недорогим и эффективным методом для снижения негативного действия гипотермии на прорастание семян является предпосевная обработка семян регуляторами роста. Цель исследования - изучение влияния низкотемпературного стресса на этиолированные и световые проростки амаранта сорта Валентина ( A. tricolor L.), выращенные из семян, обработанных регуляторами роста. Для предпосевной обработки семян использовали водные растворы Альбита - 1 г/л, перекиси водорода (H2O2) - 5 мМ и янтарной кислоты (ЯК) - 500 мг/л. Семена проращивали в торфяных горшках при температурe 23 ± 2 °C (T23) в течение 7 суток. На 7-й день торфяные горшки с проростками, выращенными на свету и в темноте, перемещали в термостат при температуре 2,0 ± 0,5 °C (T2) на 8 часов. Определение количества амарантина, хлорофиллов и каротиноидов проводили по общепринятым методикам. Предпосевная обработка семян регуляторами роста Альбит, H2O2 и ЯК увеличивала длину гипокотиля, длину корня и биомассу световых и этиолированных проростков. Действие низких положительных температур повышало содержание амарантина и каротиноидов, однако, снижало содержание хлорофиллов. Показано, что все использованные регуляторы роста: H2O2, Альбит и ЯК - запускают либо поддерживают систему антиоксидантной защиты световых и этиолированных проростков амаранта сорта Валентина при действии низких положительных температур.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Valentina</kwd><kwd>cultivar</kwd><kwd>amaranthine</kwd><kwd>photosynthetic pigments</kwd><kwd>abiotic stress</kwd><kwd>low-temperature stress</kwd><kwd>chlorophyll</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>сорт Валентина</kwd><kwd>амарантин</kwd><kwd>фотосинтетические пигменты</kwd><kwd>абиотический стресс</kwd><kwd>низкотемпературный стресс</kwd><kwd>хлорофилл</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Sanghera GS, Wani SH, Hussain W, Singh NB. Engineering cold stress tolerance in crop plants. 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