بررسی گرده‌شناسی Carex L. در ایران با تأکید بر سیستماتیک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد سیستماتیک و اکولوژی گیاهی، دانشکده علوم و فناوری زیستی، دانشگاه شهید بهشتی، تهران، ایران

2 استادیار گروه علوم و فناوری زیستی گیاهی، دانشکده علوم و فناوری زیستی، دانشگاه شهید بهشتی، تهران، ایران

3 استادیار پژوهشی مؤسسه تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

جنس Carex L. با 62 گونه از ۴ زیرجنس و ۳۰ بخشه در ایران شناخته می‌شود. این جنس دارای گروه‌های تاکسونومیکی پیچیدۀ متعددی است که ارزیابی صفت‌های تشخیصی و افتراقی را در آن ضروری می‌کنند. صفت‌های زایشی به‌ویژه گل‌آذین و گل اهمیت افتراقی زیادی در تمایز تاکسونومیکی و مرزبندی آرایه‌ها در تیرۀ Cyperaceae و جنس Carex دارند. در مطالعۀ حاضر، صفت‌های ریخت‌شناسی دانۀ گردۀ 48 آرایۀ جنس Carex از نمونه‌های هرباریومی مؤسسۀ تحقیقات گیاه‌پزشکی کشور (IRAN) و دانشگاه شهید بهشتی (HSBU) ارزیابی و با نرم‌افزار PAST نسخۀ 17/2 تحت آنالیز خوشه‌بندی و تجزیه به مولفه‌های اصلی بررسی شد. آنالیز خوشه‌ای بر اساس داده‌های گرده‌شناسی، طبقه‌بندی زیرجنس و بخشه‌های موجود در فلور ایران و فلورا ایرانیکا را تأیید می‌کند؛ با‌وجود‌این، صفت‌های گرده‌شناسی در کنار سایر صفت‌ها در تعیین محدودۀ گونه‌ها مؤثر هستند. دانه‌های گرده در این جنس به‌علت بسته‌شدن منافذ موسوم به هارمومگاتی (پدیده‌ای که در گیاهان رطوبت‌پسند رخ می‌دهد و طی آن دانۀ گرده به‌منظور حفظ آب به حالت چروکیده در‌می‌آید) تغییر شکل داده‌اند. گفتنی است دانه‌های گردۀ این جنس در ایران در اندازۀ کوچک تا متوسط طبقه‌بندی می‌شوند؛ علاوه‌براین، برخی صفت‌ها مانند تعداد منافذ و تزیینات سگزین در این جنس بیان‌کنندۀگرایش‌های تکاملی‌اند.

کلیدواژه‌ها


عنوان مقاله [English]

The Palynological Study of Carex L. with emphasis on Systematics in Iran

نویسندگان [English]

  • Ensieh Pesarkloo 1
  • Ahmadreza Mehrabian 2
  • Mohammad Amini Rad 3
  • Nahid Shafie 1
1 M. S. Student of Plant Sciences & Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University (GC), Tehran, Iran. Student
2 Assistant Professor, Department of Plant Sciences & Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University (GC), Tehran, Iran, Tehran, Iran
3 Assistant Professor, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
چکیده [English]

Abstract
The Carex L. includes 62 species of 4 subgenus belonging to 30 sections in Iran. This genus has numerous complex taxonomic groups that make it necessary to evaluate the diagnostic and differential traits. The reproductive characters especially inflorescent showing the high value to taxonomic delimitation in Cyperaceae as well Carex. This study examined 48 taxa of Carex on the basis of herbarium accessions of Iran and Shahid Beheshti University herbariums that was performed using cluster analysis as well PCA methods by PAST ver. 2.17 software. Cluster analysis did not support the classifications of Flora of Iran and Flora Iranica. However, as subsidiary evidence accompanied with other systematic traits can be effective in delimitation of taxa. Besides, due to closure of the apertures that known as harmomegathy, pollen grains has been deformed. Moreover, the pollens are classified in the small to medium class. Also, some characters such as sculpturing the sexine as well the number of apertures show some evolutionary tendencies in the genus.

کلیدواژه‌ها [English]

  • Pollen
  • Taxonomy
  • Carex
  • Iran
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