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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">1530</article-id><article-id pub-id-type="doi">10.22363/2312-797X-2014-3-5-17</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>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">On the correlation of pollen grain size and ploidy levels of genus                   Galium sect. platygalium</article-title><trans-title-group xml:lang="ru"><trans-title>К вопросу о корреляции между размером пыльцевых зерен и плоидностью у                   Galium sect. platygalium</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Schanzer</surname><given-names>I A</given-names></name><name xml:lang="ru"><surname>Шанцер</surname><given-names>Иван Алексеевич</given-names></name></name-alternatives><email>schanzer@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Elkordy</surname><given-names>A Abdel'rakhim</given-names></name><name xml:lang="ru"><surname>Элькорди</surname><given-names>Ахмед Абдельрахим</given-names></name></name-alternatives><bio xml:lang="en">Department of botany, plant physiology and agrobiotechnology</bio><bio xml:lang="ru"><p>Кафедра ботаники, физиологии растений и агробиотехнологии</p></bio><email>elkordy3000@yahoo.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Main Botanical Garden of Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Главный ботанический сад им. Н.В. Цицина РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2014-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2014</year></pub-date><issue>3</issue><issue-title xml:lang="en">NO3 (2014)</issue-title><issue-title xml:lang="ru">№3 (2014)</issue-title><fpage>5</fpage><lpage>17</lpage><history><date date-type="received" iso-8601-date="2016-09-05"><day>05</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2014, Шанцер И.А., Элькорди А.А.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder xml:lang="ru">Шанцер И.А., Элькорди А.А.</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/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://agrojournal.rudn.ru/agronomy/article/view/1530">https://agrojournal.rudn.ru/agronomy/article/view/1530</self-uri><abstract xml:lang="en">Pollen grain size of some species of Galium section Platygalium (Rubiaceae) have been studied in diploids (2 n = 2× = 22, in G. boreale , G. valantioides , G. broterianum ), tetraploids (2 n = 4× = 44, in G. boreale ), hexaploids (2n = 6× = 66, in G. boreale ) and in dodecaploid (2n = 12× = 132, in G. rubioides ), and many other species and specimens related to section Platygalium. Pollen grain size, for G. boreale diploide (P = 16.68 μm, E=15.76 μm), G. valantioides (P = 15.82 μm, E = 14.69 μm), G. broterianum (P = 15.94 μm, E = 14.97 μm); for G. boreale tetraploids (P = 17.15 μm, E = 17.21 μm); for G. boreale hexaploids (P = 18.83 μm, E = 18.80 μm) and (P = 20.87 μm, E = 21.63 μm) G. rubioides dodecaploid, was positively correlated with ploidy level. The results verify the expected correlation between mean pollen diameters and ploidy levels, and demonstrate that apparent di-, tetra-, hexa- octa-, deca-, dodeca- and possibly higher polyploidy occur among the species of sect. platygalium. Palynomorphological data revealed that in sect. Platygalium, pollen size can be directly associated with chromosome number and can also be used as an additional tool to establish evolutionary trends and taxonomic relationship among species.</abstract><trans-abstract xml:lang="ru"><p>В статье приводятся данные измерений пыльцевых зерен видов Galium sect. Platygalium у диплоидов (2 n = 2x = 22, G. boreale , G. valantioides , G. broterianum ), тетраплоидов (2 n = 4x = 44, G. boreale), гексаплоидов (2 n = 6x = 66, G. boreale), додекаплоидов (2 n = 12x = 132, G. rubioides), а также видов и подвидов, относящихся к группе Рlatygalium. Установлено наличие положительной корреляции между размером пыльцевых зерен и плоидностью у диплоидов G. boreale (P = 16,68 мкм, E = 15,76 мкм), G. valantioides (P = 15,82 мкм, E = 14,69 мкм), G. broterianum (P = 15,94 мкм, E = = 14,97 мкм), тетраплоидов G. boreale (P = 17,15 мкм, E = 17,21 мкм), гексаплоидов G. boreale (P = 18,83 мкм, E = 18,80 мкм) и додекаплоидов G. rubioides (P = 20,87 мкм, E = 21,63 мкм). В результате выявлена статистически значимая корреляция между средним диаметром пыльцы и уровнем плоидности.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Rubiaceae</kwd><kwd>Galium</kwd><kwd>Platygalium</kwd><kwd>Rubiaceae</kwd><kwd>Galium</kwd><kwd>Platygalium</kwd><kwd>pollen grain</kwd><kwd>correlation</kwd><kwd>ploidy level</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>плоидность</kwd><kwd>пыльца</kwd><kwd>корреляция</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Abdel Khalik K., Abd El-Ghani M.M. &amp; Elkordy A. A palynological study of Galium L. (Rubiaceae) in Egypt and its systematic implication // Feds. Rep. 2007. V. 118. P. 311-326.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Bremekamp C.E.B. The African species of Oldenlandia L. sensu Hiern et K. Schuman. Verh. Kon. Ned. Akad. Wetensch., Afd. Natuurk // Tweed Sect. 1952. V. 48. 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