ارزیابی پیش تیمار بذر توسّط اسید سالسیلیک بر جوانه‌زنی و خصوصیات رشدي گیاهچه گیاه دارویی سیاه دانه(Nigella sativa L.) تحت تنش شوري
محورهای موضوعی : توليد محصولات زراعي
1 - گروه کشاورزی، واحد میاندوآب، دانشگاه آزاد اسلامی، میاندوآب، ایران.
کلید واژه: پرایمینگ, جوانه زنی, سالیسیلیک اسید, سیاه دانه, شوری. ,
چکیده مقاله :
سیاه دانه از لحاظ دارویی به عنوان بادشکن، قاعده آور، مسهل، شـیرافزا ، ضـد یبوسـت و تقویـت کننـده نیـروي جنسی در مردان و در درمان سرطان، دیابت و زخم معده کاریرد دارد. اسید ساليسيليك نیز تنظیم کننده ي رشد درونی از گروه ترکیبات فنلی طبیعی است که باعث ایجاد مقاومت به تنش هاي محیطی شده و نقش اساسي در تنظيم فرآيندهاي فيزيولوژيكي مختلف مثل رشد و نمو گياه، جذب عناصر، فتوسنتز و جوانه زني ايفا مي كند. در تحقیق حاضر جهت ارزیابی پیش تیمار بذر توسط اسید سالسیلیک بر جوانه زنی و خصوصیات رشدي گیاهچه گیاه دارویی سیاه دانه(Nigella sativa L.) تحت تنش شوري، آزمايشي به صورت فاكتوريل در قالب طرح كاملا تصادفي با چهار تكرار انجام گرفت. تيمارهاي آزمايش شامل ساليسيليك اسید در چهار سطح صفر، 2/0، 6/0و 1 میلی مولار و تنش شوری در چهار سطح صفر، 100، 150و 200 میلی مولار کلرید سدیم بود. نتايج مبين كاهش معنی¬دار درصد جوانه زني، سرعت جوانه زني، طول ريشه چه، طول ساقه چه و وزن خشک گیاهچه در اثر تنش شوری بود. بیش ترین مقدار نسبت ریشه چه به ساقه چه در غلظت 200 ميلي مولار شوری بدست آمد. در مقابل ساليسيليك اسید درصد جوانه زني، سرعت جوانه زني، طول ريشه چه، طول ساقه چه، وزن خشک گیاهچه و نسبت ریشه چه به ساقه چه را در شرايط تنش شوری و غير تنش افزايش داد و بیشترین مقدار صفات در غلظت 1 میلی مولار سالیسیلیک اسید حاصل شد. طبق نتایج پيش تيمار بذر توسط اسید ساليسيليك در مناطق مستعد تنش شوري مي تواند باعث افزایش مقاومت بذر گیاه دارویی سیاه دانه در مرحله جوانه زني شود.
Black cumin is used medicinally as a decongestant, regularizer, laxative, anti -constipation and sexual enhancer in men. It is also used in the treatment of cancer, diabetes, and ulcers . Salinity stress could decrease seed germination and growth of plants. It has been found that salicylic acid as endogenous growth regulator of natural phenolic compounds that cause to reduce negative effects of the salt stress on different aspects of plant life. The current research was carried out to evaluate probable positive effects of salicylic acid on the germination and initial growth properties of Nigella Sativa when put with salinity stress. For this purpose, an experiment was conducted of factorial experiment in a randomized complete design in four replications. Treatments consisted of salicylic acid levels of 0, 0.2, 0.6 and 1 mm and salinity stress of 0, 100, 150, and 200 mm. The results indicated that salinity stress decreased germination percentage, rate of germination, radical and plumule length and seedling dry weight. The greatest effect of root/shoot ratio was obtained in concentration of 200mm salt stress. While salicylic acid increased the germination percentage, germination rate, root length, shoot length, seedling dry weight and root/shoot ratio under salt stress and non-stress. Most of these traits were observed at concentration of 1 mm salicylic acid. According to the results of seed priming by salicylic acid in regions with salt stree can increase the resistance of Nigella sativa seeds in the germination stage and initial seedling growth
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