MORPHOLOGICAL AND ANATOMICAL STUDY OF THREATENED ENDEMIC HELIOCARYA MONANDRA BGE. (BORAGINACEAE) IN IRAN

Document Type : Research Paper

Author

Payam Noor University of Isfahan, Department of Biology, P. O. Box 81395-671, Ashrafi Isfahani Blvd., Isfahan, Iran

Abstract

Heliocarya monandra is a rare endemic species of Boraginaceae that grows in a limited area in central Iran. Since there has been no comprehensive study of this species, morphological and anatomical properties of it were investigated. For this, plant samples were collected from a locality on the Soffeh Montain in the south of Isfahan city in central Iran. Sections of leaf, stem and root were taken manually and prepared according to the current laboratory methods for light microscopic examination. The measurements were done in at least 5 replicates. Some properties of fruit and seed were described. Fruit consisted of an ovoid or orbicular one-seeded nutlet with 4-6 (-7) mm length, 2.5-4 mm width and 0.8-1 mm thickness. Seed was also 1.8-2 mm long, ovoid, with a curved beak. The leaf was isobilateral with anomocytic stomata. The root showed secondary structure. The stem had also both primary and secondary tissues. The results in morphology and anatomy were in agreement with general characteristics of the family Boraginaceae except for some differences. Details of fruit and seed are reported for the first time. Fruit characters are especially important to clarifying taxonomic relationships in the family. According to field observations, there is only one population of this species in Isfahan province and it seems that this population is at risk of disappearing in nature.

Keywords

Article Title [Persian]

مطالعه ریخت‌شناسی و تشریحی گونه انحصاری و در معرض خطرHeliocarya monandra (Boraginaceae) در ایران

Author [Persian]

  • مهدی یوسفی
استادیار، گروه زیست‌شناسی دانشگاه پیام نور اصفهان
Abstract [Persian]

Heliocarya monandra گونه‌ای انحصاری و نادر از خانواده گاوزبانیان (Boraginaceae) است که در ناحیه محدودی در مرکز ایران می‌روید. با توجه به نبود مطاالعات جامع، صفات ریخت شناختی و تشریحی این گونه بررسی شد. برای این منظور نمونه‌هایی از کوه صفه در جنوب شهر اصفهان در مرکز ایران جمع‌آوری شد. از برگ، ساقه و ریشه آنها برش‌های عرضی به‌صورت دستی گرفته شد و به روش‌های رایج در آزمایشگاه برای مطالعه با میکروسکوپ نوری آماده گردیدند. اندازه‌گیری‌ها حد اقل در 5 تکرار انجام شد. برخی از ویژگی‌های میوه و دانه شرح داده شدند. میوه شامل فندقه‌ای یک دانه‌ای، تخم مرغی یا دایره‌ای به طول (7-) 6-4 میلی‌متر، به عرض 4-5/2 میلی‌متر و به ضخامت 1-8/0 میلی‌متر بود. دانه نیز به طول 2-8/1 میلی‌متر، تخم مرغی، با نوکی برگشته بود. برگ از نوع دو طرفی با روزنه‌های آنموسیتیک بود. ریشه ساختار ثانوی نشان داد، ساقه نیز دارای بافت‌های اولیه و ثانوی بود. نتایج ریخت‌شناختی و تشریحی به جز در برخی موارد با ویژگی‌های عمومی خانواده گاوزبانیان منطبق بود. جزئیات میوه و دانه در این گیاه برای اولین بار گزارش می‌شوند. صفات میوه به‌طور اخص برای روشن نمودن روابط آرایه‌شناسی این خانواده مهم‌ است. بر طبق مشاهدات صحرائی تنها یک جمعیت از این گونه در استان اصفهان وجود دارد که این جمعیت نیز در معرض خطر ناپدید شدن از صحنه طبیعت قرار دارد.

Keywords [Persian]

  • Heliocarya monandra
  • Boraginaceae
  • Endemic
  • Morphology
  • Anatomy
  • Iran

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The Iranian Journal of Botany
Volume 16, Issue 2 - Serial Number 2
December 2010
Pages 273-281

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History

  • Receive Date: 17 March 2010
  • Revise Date: 11 August 2010
  • Accept Date: 20 September 2010

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