NEW CHROMOSOME COUNTS IN FIVE SPECIES OF OXYTROPIS (FABACEAE) IN IRAN

Document Type : Research Paper

Authors

Department of Biology, Herbarium division, Bu-Ali-Sina University, P.O. Box 65175/4161, Hamedan, Iran.

Abstract

In this study original mitotic chromosome counts are presented for 4 Oxytropis species from 4 sections of the genus Oxytropis in Iran including: O. bicornis (O. sect. Oxytropis) (2n = 2x = 16), O. suavis (O. sect. Ortholoma) (2n = 2x = 16), O. aucheri (O. sect. Eumorpha) (2n = 2x = 16) and O. karjaginii (O. sect. Janthina) (2n = 4x = 32). This report is the first cytogenetic analysis of these taxa. All taxa (with exception of O. karjaginii) are diploid and possess 2n = 2x = 16 chromosome number, consistent with the proposed base number of x = 8. In addition, meiotic chromosome count and behavior are presented for O. masanderanensis (O. sect. Ortholoma) (2n = 2x = 16). Although this taxon displayed regular bivalent pairing and chromosome segregation at meiosis, but some abnormalities were observed.

Keywords

Article Title [Persian]

گزارش شمارش کروموزومی جدید برای 5 گونه از جنس Oxytropis در ایران

Authors [Persian]

  • مسعود رنجبر
  • رویا کرمیان
  • سهیلا بیات
استادیار گروه زیست شناسی دانشگاه بوعلی سینا.
Abstract [Persian]

در این مطالعه، گزارش عدد کروموزومی میتوز برای 4 گونه متعلق به 4 بخش از جنس Oxytropis در ایران شامل O. bicornis از بخش Oxytropis (2n = 2x = 16)؛ O. suavis. از بخش Ortholoma (2n = 2x = (16،O. aucheri  از بخش Eumorpha (2n = 2x = 16) وO. karjaginii  از بخش Janthina (2n = (4x = 32 ارائه شده است. این گزارش اولین مطالعه سیتوژنتیکی بر روی این تاکسون‌ها می‌باشد. تمام گونه های مورد مطالعه (به استثناء O. karjaginii) دیپلوئید هستند و عدد  2n = 2x = 16را نشان می دهند که با عدد کروموزومی پایه پیش بینی شده x = 8 مطابقت دارد. همچنین عدد کروموزومی و رفتار میوزی درO. masanderanensis  متعلق به بخش Ortholoma مورد مطالعه قرار گرفت که عدد کروموزومی (2n = 2x = 16) را نشان داد. اگرچه جفت شدگی بی‌والان‌ها و تفکیک کروموزوم‌ها در این گونه عادی است، لیکن برخی ناهنجاری‌ها در طی میوز در این گونه مشاهده می‌شود.

Keywords [Persian]

  • meiotic behavior
  • Mitosis
  • Morphology
  • Oxytropis
  • Iran

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History

  • Receive Date: 11 November 2015
  • Accept Date: 11 November 2015

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