Taxonomic significance based on palynological data of the genus Sedum in Iran

Document Type : Research Paper

Authors

1 PhD Student, Department of Biology, Faculty of Science, University of Guilan, Rasht, Iran

2 Associate Prof., Department of Biology, Faculty of Science, University of Guilan, Rasht, Iran

Abstract

In the current survey, a detailed account in pollen morphology of 22 species of Sedum s.l. in Iran are presented using light (LM) and scanning electron microscopy (SEM). The pollen grains are radially symmetrical, isopolar, mostly trizonocolporate and rarely tetrazonocolporate, small-to-medium sized, prolate, subprolate, and prolate-spheroidal in shape. Two types of exine sculpturing (regulate-striate and regulate-striate-perforate) were recognized. Among the examined characters, pollen shape and size were taxonomically useful in the intergeneric classification and segregation of the genera Phedimus and Hylotelephium from Sedum s.s.. Numerical analysis (unweighted pair-group method with arithmetic averages and principal components analysis) of 15 qualitative and quantitative characters also confirmed the delimitation of these genera. The PCA analysis of the selected pollen morphological characters indicated the alliance of two sections Sedum and Epeteium. Pollen morphological characters are also taxonomically informative to provide good data for species delimitation.
 
 

Keywords

Article Title [Persian]

اهمیت آرایه‌شناختی داده‌های گرده‌شناسی در جنس Sedum از ایران

Authors [Persian]

  • مریم محمدی شهرستانی 1
  • مرضیه بیگم فقیر 2
1 دانشجوی دکتری، گروه زیست‌شناسی، دانشکده علوم، دانشگاه گیلان، رشت، ایران
2 دانشیار گروه زیست‌شناسی، دانشکده علوم، دانشگاه گیلان، رشت، ایران
Abstract [Persian]

در این مطالعه، دانه‌های گرده 22 گونه از جنس Sedum s.l. متعلق به تیره گل‌نازیان از ایران با استفاده از میکروسکوپ نوری (LM) و میکروسکوپ الکترونی نگاره (SEM) مورد بررسی قرار گرفتند. نتایج نشان داد که دانه‌های گرده متقارن شعاعی، جور قطب، عمدتا دارای سه شیار منفذی (به ندرت چهار شیار)، کوچک تا متوسط و در شکل‌های کشیده، تقریبا کشیده و کشیده-کروی بودند. در بررسی سطح دانه گرده، دو نوع مختلف از تزیینات اگزین در نمونه‌ها مشاهده شد (چروکیده-مخطط و چروکیده-مخطط-سوراخدار). از میان ویژگی‌های بررسی شده، اندازه و شکل دانه گرده دو صفت مهم آرایه‌شناختی در سطح جنس محسوب شده که در تفکیک اعضای دو جنسPhedimus  و Hylotelephium از جنس .Sedum s.s مؤثر بودند. نتایج آنالیز عددی براساس 15 صفت کمّی و کیفی نیز تایید‌کننده تعیین حدود این جنس‌ها از یکدیگر بود. آنالیز صفات ریخت‌شناسی انتخاب شده نزدیکی دو بخش Sedum و Epeteium را در جنس Sedum s.s. نشان داد. همچنین، صفات ریخت‌شناسی گرده، از نظر آرایه‌شناختی در تعیین حدود گونه‌های نزدیک بسیار مفید بود.
 
 
 

Keywords [Persian]

  • تزیینات
  • تیره گل‌نازیان
  • جورقطب
  • چند‌شکلی
  • شیار
  • Prometheum

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Rostaniha
Volume 22, Issue 2 - Serial Number 62
December 2021
Pages 259-272

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History

  • Receive Date: 22 November 2021
  • Revise Date: 22 December 2021
  • Accept Date: 17 January 2022

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