ارزش تکوینی و سیستماتیکی اندام‌های زایشی گل در درمنه خزری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه علوم گیاهی، دانشکده علوم زیستی، دانشگاه خوارزمی تهران، ایران

2 استاد گروه زیست‌شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان، ایران

3 دانشیار گروه زیست‌شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان، ایران

10.22092/bot.j.iran.2024.366507.1393

چکیده

 هدف از این مطالعه، مشخص کردن ویژگی‌های رویان‌شناختی درمنه خزری (کاسنیان) با تمرکز بر تکوین دانه گرده و تخمک به منظور کمک به جایگاه سیستماتیکی این گونه بود. به این منظور، از میکروسکوپ نوری و الکترونی نگاره برای توصیف تکوین گل استفاده شد. با توجه به نتایج، شکل‌گیری دیواره بساک در این گونه از نوع دولپه‌ای، لایه مغذی بساک چندهسته‌ای و از نوع ترشحی بود. تتراد میکروسپورها از دو نوع تتراگونال و تتراهدرال و دانه‌های گرده هنگام شکوفایی دویاخته‌ای، سه‌منفذی و ریزخاردار بودند. تخمک از نوع واژگون، تک‌پوسته‌ای و کم‌خورش و آرکئوسپور تک‌یاخته‌ای بود. تترادهای مگاسپور T شکل و خطی مشاهده شد. مگاسپور قطب سفتی طبق الگوی تک‌اسپوری و علف هفت‌بند به کیسه‌رویانی هشت هسته‌ای نمو یافت. لقاح از نوع سفت‌زامی (porogamous) و تکوین آندوسپرم در این گونه از نوع یاخته‌ای بود. برخی از ویژگی‌های رویان‌زایی کاسنیان، Calyceraceae و Goodeniaceae نیز در این مقاله آورده شده که مقایسه این موارد نشان داد ویژگی‌های رویان‌زایی شواهد آشکاری برای جداسازی این سه تیره‌ خویشاوند ارایه می‌دهد. در نتیجه بررسی حاضر، نگارندگان پیشنهاد می‌کنند که طی مطالعات سیستماتیک جنس درمنه خزری و جنس‌های مشابه، لازم است علاوه بر تزیینات دانه گرده، مراحل تکوین بساک و دانه گرده نیز مورد بررسی قرار گیرند. به علاوه، مطالعات کیسه‌رویانی شاید بتواند تفاوت‌های نهان سیستماتیکی بین آرایه‌های مختلف آن‌ها را آشکار سازد.

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