Positive effects of karrikin on seed germination of three medicinal herbs under drought stress

Document Type : Full Article

Authors

1 Department of Agronomy, College of Agriculture, University of Zabol, Zabol, I. R. Iran

2 Department of Horticultural Science, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

Abstract

ABSTRACT- Improper seed germination is a serious challenge for medicinal herbs under drought stress conditions in semi-arid and arid regions. A new group of plant growth regulators known as karrikins have been proved useful to improve seed germination in some plants. In this regard, the effects of karrikin on seed germination and vigor of three medicinals under drought stress were examined. Seeds of Trachyspermum copticum (L.) Link, Foeniculum vulgare Miller, and Cuminum cyminum L. were sowed under drought treatments (-1, -1.5, -2 and -2.5 MPa of PEG 6000), with and without synthetic Karrikin GR24 (10µM). Results indicated increasing osmotic pressure seed germination characteristics were severely reduced; however, karrikin significantly increased the seed germination of the three herbs. The application of karrikin in all drought conditions significantly increased germination percentage, germination rate, germination index, seedling vigor, shoot length and radicle length of all herb seedlings. Ajwain (T. copticum) showed a greater drought tolerance compared to the other medicinal species.

Keywords


Article Title [Persian]

تأثیر مثبت کاریکین بر جوانه زنی بذر سه گیاه دارویی تحت تنش خشکی

Authors [Persian]

  • محسن موسوی نیک 1
  • ابوالفضل جوکار 2
  • عبدالرحمان رحیمیان بوگار 2
1 دانشگاه زابل
2 بخش علوم باغبانی، دانشکده کشاورزی، دانشگاه شیراز
Abstract [Persian]

چکیده- جوانه زنی نامناسب بذر گیاهان دارویی در مناطق نیمه خشک و خشک یک چالش مهم به حساب می آید. مشخص شده است که یک گروه جدید از تنظیم کننده های رشد گیاهی، معروف به کاریکین ها، برای بهبود جوانه زنی بذر برخی گیاهان مفید هستند. در این راستا تأثیر کاریکین بر جوانه زنی و قدرت دانهال سه گیاه دارویی تحت تنش خشکی مورد بررسی قرار گرفت. بذرهای زنیان (Trachyspermum copticum (L.) Link)، رازیانه (Foeniculum vulgare Miller) و زیره سبز (Cuminum cyminum L.)  تحت تیمارهای خشکی (1-، 5/1-، 2- و 5/2-  MPa  از (PEG 6000 با یا بدون استفاده از کاریکین سنتزی GR24 (10µM) کشت شدند. اگرچه با افزایش فشار اسمزی مشخصات جوانه زنی بذر به شدت کاهش یافت، اما کاریکین بطور معنی داری فاکتورهای جوانه زنی سه گیاه دارویی را افزایش داد. کاربرد کاریکین در تمام شرایط خشکی بطور  معنی داری درصد جوانه زنی، سرعت جوانه زنی، شاخص جوانه زنی، قدرت دانهال، طول شاخساره و طول ریشه چه تمام دانهال های گیاهان دارویی را افزایش داد. زنیان (T. copticum) در مقایسه با دیگر گونه های دارویی تحمل به خشکی بیشتری نشان داد.

Keywords [Persian]

  • واژه های کلیدی:
  • استریگولاکتون
  • قدرت دانهال
  • Cuminum cyminum Foeniculum vulgare Trachyspermum
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