Palynological study of some species of Anthemis genus and its systematic implications

Document Type : Research Paper

Authors

1 Research Assistant Prof., Forests and Rangelands and Watershed Research Department, Guilan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran

2 Researcher, Department of Botany, Naturhistorisches Museum Wien, Burgring 7, Wien 1010, Austria

Abstract

To clarify taxonomic complexity within the Anthemis species, pollen grains of 19 species belonging to three sections of the genus Anthemis sensu strictoand two species of the genus Cota from Iran were examined by using scanning electron microscopy. The pollen grains morphological characteristics are provided for this genus in detail. Pollen grains were trizonocolporate and echinate. The pollen grains shape was prolate and spheroidal with the mean polar axes 20–35 μm and the mean equatorial diameter 20.3–26.5 μm. Among the studied taxa, A.microcephala showed the smallest pollen grains, and A. odontostephana possessed the largest ones. The spines were commonly conical with a broad basis, ornamentation within spines was generally rugulate-perforate. Thirteen pollen quantitative and qualitative characters have been analysed statistically by employed UPGMA, PCA and MDS in PAST software. Numerical analysis showed that, features as pollen shape, exine ornamentation, spine length and density were valuable characters for separating the examined taxa. In the resulting clusters, three groups within the investigated species have been recognized. The results derived from the present study, therefore, proved to be concomitant with the previous study on taxonomic infrageneric classification. The palynological evidences confirmed the sectional divisions, and revealed that, A. brachystephana and
A. lorestanica in A. sect. Anthemis, have close relationship with A. odontostephana. The palynological characters of sect. Anthemis were similar to Tripleurospermum and Cota. The analysis of the palynological data confirmed the conventional taxonomic classification of the genus Anthemis rather than the phylogenetic classification of the genus.
 
 

Keywords

Article Title [Persian]

مطالعه گرده‌شناسی برخی گونه‌های جنس Anthemis و اهمیت سیستماتیکی آن

Authors [Persian]

  • محمود بیدارلرد 1
  • ارنست ویتک 2
1 استادیار پژوهش، بخش تحقیقات جنگل‌ها، مراتع و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان گیلان، سازمان تحقیقات،
2 محقق گروه گیاه‌شناسی، موزه تاریخ طبیعی وین، وین، اتریش
Abstract [Persian]

با هدف روشن نمودن پیچیدگی‌های آرایه‌شناختی جنس Amthemis، ریخت‌شناسی دانه گرده 19 گونه متعلق به سه بخش از جنس Anthemis (با مفهوم محدود) و دو گونه از جنس Cota از ایران با استفاده از میکروسکوپ الکترونی نگاره (SEM) مورد بررسی قرار گرفتند. در این تحقیق، مشخصات دقیق ریخت‌شناسی دانه‌های گرده این جنس ارایه می‌شود. دانه‌های گرده از نوع سه شیار-منفذی میانی و خادردار بودند. شکل گرده‌ها پرولیت و گرد با طول محور قطبی 35-20 میکرومتر و طول محور استوایی 5/26-3/20 میکرومتر بود. کوچک‌ترین دانه گرده در
A. microcephala و بزرگ‌ترین آن در A. odontostephana یافت شد. خارها به طور معمول هرمی با قاعده پهن و آرایش سطحی بین خارها عمدتا چروکیده-حفره‌دار بودند. سیزده صفت کمی و کیفی به کمک روش UPGMA،  MDSو PCA در نرم‌افزار  PASTمورد بررسی قرار گرفتند. آنالیز عددی نشان داد که در جدایی آرایه‌های بررسی شده، صفاتی مانند شکل دانه گرده، تزیینات اگزین، طول و تراکم خار‌ها، مشخصه‌های با ارزشی هستند. داده‌های گرده‌شناسی تقسیم‌بندی موجود بخش‌های این جنس را تایید نمود، به طوری که آنالیز خوشه‌بندی گونه‌های بررسی شده را به
سه گروه مجزا تقسیم‌بندی کرد و مشخص شد که  A. brachystephanaو A. lorestanica از  A. sect. Anthemisقرابت زیادی با
A. odontostephana داشتند. مشخصات دانه‌های گرده A. sect. Anthemis با جنس‌های Tripleurospermum و Cota مشابهت زیادی داشت و داده‌های گرده‌شناسی جنس Anthemis از آرایه‌شناختی مرسوم نسبت به طبقه‌بندی فیلوژنی بیشتر حمایت می‌کند.
 

Keywords [Persian]

  • بابونه
  • کاسنیان
  • دانه گرده
  • ریزریخت‌شناسی
  • Cota

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Rostaniha
Volume 21, Issue 2 - Serial Number 60
December 2020
Pages 278-291

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History

  • Receive Date: 29 September 2020
  • Revise Date: 20 November 2020
  • Accept Date: 12 December 2020

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