https://journal.sops.gov.ua/ <p>“Plant Varieties Studying and Protection” Journal of Applied Research is scientific research publishing of Ukrainian Institute for Plant Variety Examination, Plant Breeding &amp; Genetics Institute, National Center of Seeds and Cultivar Investigation of NAAS, Institute of Plant Physiology and Genetics, National Academy of Sciences Of Ukraine, which are its co-founder.</p> <p>It is inacceptable for the publisher to break the established terms of publication and release of any issue of the Journal out-of-term.</p> <p>Periodicity period for 2016 is four times a year (1 times per quarter).</p> <p>The Journal is registered in International Standard Serial Number. ISSN − 2518-1017.</p> <p>The journal is licensed <a href="https://creativecommons.org/licenses/by-sa/4.0/" rel="license">Creative Commons Attribution-ShareAlike 4.0 International License</a><br /><a href="https://creativecommons.org/licenses/by-sa/4.0/" rel="license"><img style="border-width: 0pt;" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" alt="Creative Commons License" /></a></p> <p>Distribution: domestic, foreign.</p> <p class="western" align="JUSTIFY">According to the order of the Ministry of Education and Science of Ukraine No 515 of May 16, 2016 "On approving the decisions of the Attestation Board of the Ministry on specialized academic councils activity of May 12, 2016" (Annex 12 to the order,(<a href="https://old.mon.gov.ua/ua/about-ministry/normative/5526-">https://old.mon.gov.ua/ua/about-ministry/normative/5526-</a> ), the journal "Plant variety studying and protection" is registered in the List of scientific professional editions of Ukraine in which results of theses research for obtaining a Ph.D. degree (Agriculture and Biology) can be published.</p> <p>The Journal is open for free access by the V.I. Vernadsky National Library of Ukraine (<a href="https://www.nbuv.gov.ua/">https://www.nbuv.gov.ua</a> )</p> <p>The Journal publishes the articles the Ukrainian and English languages.</p> <p>The Journal is published based on the decision of the Academic Council of Ukrainian Institute for Plant Variety Examination.</p> <p>Editorial Board of the Journal includes 36 Doctors of Science including 13 foreign members.</p> <p>The Journal has own web-site <a>https://journal.sops.gov.ua </a></p> <p>Subscription order of Plant Varieties Studying and Protection Journal can be made at Post Office of Ukraine. Ukrainian subscription index of the print version – 89273.</p> <p>The editorial board does not provide fee to authors of articles. Materials are published for free.</p> <p>All organizational and financial costs of the collection issuing are covered by Ukrainian Institute for Plant Variety Examination</p> <p>The editorial board considers as a priority to include the Journal into international abstract and scientometric databases, including Scopus and Web of Science.</p> <p>With best regards,</p> <p>Editor-in-chief of the «Plant Varieties Studying and Protection» Journal, </p> <h4>Serhiy Melnyk</h4> Ukrainian Institute for Plant Variety Examination en-US Plant varieties studying and protection 2518-1017 <p>Starting in 2022, the copyright to the publication remains with the authors</p> <p>Our journal abides by the CREATIVE COMMONS copyright rights and permissions for open access journals.</p> <p>Authors, who are published in this journal, agree to the following conditions:</p> <ol> <li>The authors reserve the right to authorship of the work and pass the first publication right of this work to the journal under the terms of a Creative Commons Attribution License, which allows others to freely distribute the published research with the obligatory reference to the authors of the original work and the first publication of the work in this journal.</li> <li>The authors have the right to conclude separate supplement agreements that relate to non-exclusive work distribution in the form in which it has been published by the journal (for example, to upload the work to the online storage of the journal or publish it as part of a monograph), provided that the reference to the first publication of the work in this journal is included.</li> </ol> https://journal.sops.gov.ua/article/view/339314 <p><strong>Purpose.</strong> To investigate the content of free proline and lectin activity in soybean (<em>Glycine max</em> L.) of different varieties during the phases when they are most sensitive to moisture: the beginning and full flowering, and the formation and filling of beans. <strong>Methods</strong>. The research focused on the leaves from the two upper nodes of plants of 17 soybean varieties of domestic and foreign breeding. Free proline content was determined using a spectrophotometric method and lectin activity was determined using haemagglutination of trypsinised blood erythrocytes. The research results were statistically analysed using LibreOffice Calc (GNU Lesser General Public Licence v3). <strong>Results.</strong> Screening soybean varieties for proline content and lectin activity in plant leaves revealed varietal differences in reproductive phase development according to these indicators. These were significantly higher during the bean formation and filling stage than at the beginning and full flowering stage. A high correlation coefficient (<em>r</em> = 0.72 at P = 0.05) was found between moisture content and lectin activity during the bean formation and filling phase. <strong>Conclusions.</strong> Changes in proline content and lectin activity were observed during the three phases of plant development. The highest values were recorded during the formation and filling stages of bean development. This suggests that soybeans activate adaptive responses under unfavourable growing conditions, particularly drought. The results obtained allow us to recommend measuring lectin activity and proline content in plant leaves during the formation and filling stages of beans as an additional way of studying the adaptive potential of soybean varieties.</p> O. O. Molodchenkova V. I. Sichkar H. D. Lavrova L. Ya. Bezkrovna Ya. S. Fanin Copyright (c) 2025 O. O. Molodchenkova, V. I. Sichkar, H. D. Lavrova, L. Ya. Bezkrovna http://creativecommons.org/licenses/by-sa/4.0 2025-09-24 2025-09-24 21 3 10.21498/2518-1017.21.3.2025.339314