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

درمنه خزری (کاسنیان)، گونه‌­ای با پتانسیل دارویی بالا است. هدف از این مطالعه، مشخص کردن ویژگی‌های رویان­‌شناختی درمنه خزری 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 گونه مذکور از نوع دو­لپه‌­ای، لایه مغذی بساک چند­هسته‌­ای و از نوع ترشحی بود. تتراد میکروسپورها از دو نوع تتراگونال و تتراهدرال و دانه­‌های گرده در هنگام شکوفایی دوسلولی، سه‌منفذی و ریزخاردار بودند. تخمک از نوع واژگون، تک‌­پوست‌ه­ای و کم‌­خورش و آرکئوسپور تک‌­سلولی 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 سلولی بود. برخی از ویژگی‌­های رویان­‌زایی کاسنیان، Calyceraceae  و Goodeniaceae  نیز در این مقاله آورده شده است. مقایسه نشان داد که ویژگی­‌های رویان‌­زایی شواهد آشکاری برای جداسازی این تیره‌­های خویشاوند ارایه می‌­دهد. در نتیجه بررسی حاضر، نگارندگان پیشنهاد می‌­کنند که مطالعات سیستماتیک روی جنس درمنه و جنس­‌های مشابه فقط روی تزیینات دانه گرده نبوده و لازم است مراحل تکوین بساک و دانه گرده نیز مورد بررسی قرار گیرد. به علاوه، مطالعات کیسه­‌رویانی شاید بتواند تفاوت‌­های نهان سیستماتیکی بین آرایه­‌های مختلف را نیز آشکار سازد.
 

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