Taxonomic importance of pollen micromorphology in Prunus L. subgenus Cerasus Pers. (Rosaceae) from Iran

Document Type : Research Paper

Authors

1 Central Herbarium of Tehran University, School of Biology, College of Science, University of Tehran, Iran & Department of Biology, Faculty of Science & Engineering, Gonbad Kavous University, Gonbad, Iran

2 Central Herbarium of Tehran University, School of Biology, College of Science, University of Tehran

3 Central Herbarium of Tehran University, School of Biology, College of Science, University of Tehran and NTNU University Museum, Norwegian University of Science and Technology, Trondheim, Norway

10.22092/ijb.2022.128196

Abstract

Prunus subgenus Cerasus belongs to the Rosaceae family with about 100 species in the world, of which 19 taxa are distributed in Iran. Pollen micromorphological traits of the Iranian taxa belonging to three sections, (Microcerasus, Cerasus, and Mahaleb) were examined using light and scanning electron microscopes. The hierarchical clustering method and principal component analysis of the pollen traits were performed using InfoStat. The results showed that in the subgenus Cerasus pollen grains are monad, radially symmetrical, isopolar, tricolpate to tricolporate, and medium-sized. Pollen shape is rectangular to cylindrical in the equatorial view and triangular to circular in the polar view. The exine ornamentation is striate with or without perforations. The studied pollen can be divided into two types and six subtypes. The rugulate exine ornamentation was only found in P. pseudoprostrata. Ward’s hierarchical clustering method and principal component analysis results did not support the existing sectional delimitation of taxa. However, a high variation in pollen grain characteristics could be observed in taxa within the subgenus Cerasus, especially in dwarf cherries (sect. Microcerasus). These differences are remarkable among closely related species, such as P. microcarpa and its allies. Finally, an identification key to the species is provided.

Keywords

Article Title [Persian]

اهمیت آرایه‌شناسی ریزریخت‌شناسی دانه گرده در زیرسرده .Prunus L. subgen. Cerasus Pers (تیره گل سرخیان) از ایران

Authors [Persian]

  • میثم حبیبی 1
  • فریده عطار 2
  • محسن فلاحتی عنبران 3
1 فارغ التحصیل دکتری سیستماتیک گیاهی، دانشگاه تهران، تهران و مربی گروه زیست شناسی دانشگاه گنبد کاووس، گنبد
2 استاد دانشکده زیست‌شناسی، پردیس علوم دانشگاه تهران
3 استادیار دانشکده زیست‌شناسی، پردیس علوم دانشگاه تهران، دانشکده علوم و فنون دانشگاه نروژ، تروندهیم، نروژ
Abstract [Persian]

زیرسرده­ی Cerasus متعلق به سرده­ی Prunus و تیره گل­سرخیان (Rosaceae) است و شامل 100 آرایه در جهان می­باشد که از این میان 19 آرایه آن در ایران پراکنش دارد. صفات ریز­ریخت­شناسی دانه گرده آرایه­های ایرانی زیرسرده Cerasus متعلق به سه بخش Microcerasus، Cerasus و Mahaleb با استفاده از میکروسکوپ نوری و میکروسکوپ الکترونی نگاره برای اولین بار مطالعه شد. تحلیل داده­ها با استفاده از نرم­افزار InfoStat انجام شد. نتایج نشان دادند که دانه­های گرده Cerasus، موناد، متقارن شعاعی، جورقطب، سه­شیاری یا سه­شیار منفذی و دارای اندازه متوسط هستند. شکل دانه گرده در نمای استوایی چهارگوش تا استوانه­ای و در نمای قطبی سه­گوش تا مدور است. تزئینات اگزین مخطط، دارای منفذ یا بدون منفذ بودند که از این جهت­ می­توان آنها را به دو گروه اصلی و شش زیرگروه تقسیم کرد. تزئینات rugulate  فقط در گونه­ P. pseudoprostrata مشاهده شد. روش خوشه­بندی سلسله­مراتبی Ward و تجزیه به مولفه­های اصلی (PCA) در اغلب صفات از تعیین حدود بخش­ها حمایت نکرد. با این­حال، تنوع زیادی در صفات دانه گرده درون زیرسرده آلبالو، به­ویژه در آلبالوهای کوتاه قد (بخش Microcerasus) مشاهده شد. این تفاوت­ها به­ویژه در برخی آرایه­ها با روابط خیلی نزدیک همچون P. microcarpa و خویشاوندانش قابل توجه بود. در نهایت، یک کلید تشخیصی برای گونه­ها تهیه شد.

Keywords [Persian]

  • Rosaceae
  • Cerasus
  • pollen
  • statistical analyses
  • exine ornamentation
  • Iran

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The Iranian Journal of Botany
Volume 28, Issue 2
December 2022
Pages 96-112

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History

  • Receive Date: 26 June 2022
  • Revise Date: 01 November 2022
  • Accept Date: 29 November 2022

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