MICRO - MACRO MORPHOLOGY OF THE GENUS GEUM L. (ROSACEAE) IN IRAN AND THEIR TAXONOMIC SIGNIFICANCE

Document Type : Research Paper

Authors

1 University of Guilan, Rasht.

2 University of Guilan, Rasht

3 University of Tarbiat Modares, Tabriz, Iran.

Abstract

In the current survey, pollen, seed and fruit micro-morphological characters of the genus Geum L., comprising 5 species from two subgenera, Orthostylus Fisch & Mey. and Geum were examined using scanning electron microscope (SEM) and light microscope (LM). The pollen grains are monad, radially symmetrical, isopolar, tricolporate, medium in size, elliptical (from equatorial view) and triangular to circular (from polar view) in outline, subprolate to prolate in shape. The exine ornamentation is striate with micro perforation. Seeds coat micro -morphology revealed two types of sculpturing (including sulcat-ribbed and sulcat-foveolate) and fruits morphological analysis showed the importance of joint position and hairs on the style, beak length and hook in this genus. Principal component analysis (PCA) was carried out using a total of 20 characters. The result supports current classifications and emphasizes the importance of micro- macro-morphologocal traits for separating the two subgenera and species of the genus. Based on the important distinguishing characters a key is presented.

Keywords

Article Title [Persian]

مطا لعه ریز ریخت شناسی و ریخت شناسی سرده Geum در ایران و اهمیت کاربرد آنها در تاکزونومی

Authors [Persian]

  • مرضیه بیگم فقیر 1
  • مریم آرمودیان مقدم 2
  • ربابه شاهی شوان 3
1 استادیار دانشگاه گیلان، رشت، ایران
2 دانشجوی کارشناسی ارشد دانشگاه گیلان، رشت، ایران
3 دانشجوی دکتری دانشگاه تربیت مدرس تبریز، ایران
Abstract [Persian]

مطالعه حاضر به بررسی صفات ریزریخت‌شناسی گرده ،  پوسته بذر و ریخت‌شناسی میوه 5 گونه از سرده Geum متعلق به دو زیر  جنس Orthostylus Fisch & Mey. و  Geum با استفاده از میکروسکوپ الکترونی نگاره(SEM ) و نوری (LM) اختصاص دارد. گرده‌ این گیاهان به صورت موناد، متقارن‌شعاعی، جور قطب، سه شیاری- منفذی و دارای اندازه متوسط، طرح کلی بیضی (از نمای استوایی) و سه‌گوش تا تقریباً مدور (از نمای قطبی) و به شکل تقریباً استوانه ای – استوانه ای هستند. تزئینات اگزین راه‌راه با منافذ میکروسکوپی است. مطالعه ریز ریخت شناسی پوسته بذر دو نوع تزیینات  شامل پشته ای- نواری و پشته ای – موجدارآشکار ساخت و بررسی ریخت شناسی میوه اهمیت موقعیت مفصل روی خامه، طول منقار و قلاب در این جنس را نشان داد. در مجموع 20 صفت به روش تجزیه مولفه اصلی (PCA) مورد ارزیابی قرار گرفتند .نتایج این آنالیز ضمن حمایت از رده بندی های موجود، بر اهمیت صفات ریز ریخت شناسی و ریخت شناسی در تفکیک زیر سرده‌ها و گونه‌ها ی این سرده تاکید دارد. بر اساس صفات مهم تشخیصی یک کلید شناسایی ارایه شده است.

Keywords [Persian]

  • Morphology
  • micro morphology
  • pollen
  • Seed coat
  • Fruit
  • Geum
  • Rosaceae

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The Iranian Journal of Botany
Volume 21, Issue 2 - Serial Number 2
December 2015
Pages 103-117

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History

  • Receive Date: 10 June 2015
  • Revise Date: 30 July 2015
  • Accept Date: 19 August 2015

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