A COMPARATIVE CYTOLOGICAL STUDY IN THE D GENOME-BEARING SPECIES OF TRITICUM-AEGILOPS COMPLEX

Document Type : Research Paper

Authors

Department of Biology, University of Isfahan, Isfahan, Iran.

Abstract

The wild D genome-bearing Aegilops L. species. are considered to be sources of useful alleles which can be used in bread wheat improvement. We examined the karyotype asymmetry of the D genome-bearing species and analyzed the data to look for their evolutionary correlations. A total number of eleven accessions belonging to seven D genome species and Triticum aestivum L. were used for this study. The observations of the analyzed factors showed that Ae. vavilovii (Zhuk.) Chen. posses the most symmetric karyotypes and Ae. cylindrica Host. the most asymmetric ones. Both species Ae. crassa Boiss. and Ae. vavilovii carrying a common genomic formula (XD) showed a similar karyotype asymmetry. The results of this study compared with the literature showed that the degree of karyotype asymmetry of the D genome has a correlation with the time of divergence from its ancestral progenitors. Our results suggest that the karyotype asymmetry analysis can be a useful tool to have an overall view over the genomic relationships and modifications and also a good measure to estimate the relative date of the origin of allopolyploidy of the D genome cluster.

Keywords

Article Title [Persian]

بررسی مقایسه ای سیتولوژیکی گونه های حامل ژنوم D در گروه Triticum-Aegilops

Authors [Persian]

  • فیروزه بردبار
  • حجت الله سعیدی
  • محمد رضا رحیمی نژاد
داشجوی دکتری ، گروه زیست شناسی دانشگاه اصفهان.
Abstract [Persian]

از آنجا که گندم نان (T. aestivum) دارای ژنوم D می باشد، دارندگان ژنوم D از جنس Aegilops، می تواند به عنوان منبع آللی مفید قابل انتقالی به گندم نان مورد استفاده قرار گیرد. در این تحقیق نحوه تقارن کاریوتایپی دارندگان ژنوم D از جنس Aegilops و نیز گونه T. aestivum، جهت بررسی ارتباطات تکاملی آنها مورد بررسی قرار گرفته است. در حدود 11 جمعیت متعلق به هفت گونه دارنده ژنوم D برای این بررسی مورداستفاده قرار گرفت. بر اساس پارامترهای ارزیابی شده در این تحقیق، در میان کلیه گونه های مطالعه شده، گونه Ae. cylindrica  نامتقارن ترین کاریوتایپ و در مقابل گونه Ae. vavilovii متقارن ترین کاریوتایپ را نشان می دهد. دو گونه Ae. crassa و Ae. vavilovii که دارای دو ژنوم مشترک (XD ) هستند، سطح تقارن کاریوتایپی مشابهی را نشان دادند. نتایج این بررسی با مقایسه با بررسی های پیشین نشان داد که درجه تقارن کاریوتایپی ژنوم D با زمان انشقاق گونه از والد خود ارتباط مستقیم دارد. نتایج این بررسی پیشنهاد می کند که بررسی تقارن کاریوتایپی می تواند ابزار مفیدی جهت شناخت ارتباطات و تغییرات ژنومی و نیز مقیاس مناسبی جهت تخمین تاریخ نسبی منشا آلوپلی پلوئیدی در خوشه ژنوم D باشد.

Keywords [Persian]

  • Aegilops
  • genomic modification
  • Iran
  • karyotype asymmetry
  • Triticum
  • Poaceae

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The Iranian Journal of Botany
Volume 15, Issue 2 - Serial Number 2
December 2009
Pages 240-247

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History

  • Receive Date: 15 August 2009
  • Revise Date: 02 November 2009
  • Accept Date: 02 December 2009

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