اثرات افشانه کردن جیبرلین(GA3) بر ویژگی‌های رشدی و عملکرد اسانس گیاه زینتی- دارویی اسطوخودوس(Lavandula officinalis Chaix.)

An experiment was carried out to investigate the effects of different concentrations of gibberellic acid (GA₃) as foliar application on growth and essential oil content and yield of lavender based on randomized complete block design with five treatments and four replications. The treatments consisted of different concentrations of gibberellic acid (T₂=100, T₃=200 and T₄=300 mg/l), formulated (tablet) gibberellic acid (T₅) and the control (T₁=0). Essential oil of dried shoots and flowering stalks were extracted by hydro-distillation method using Clevenger type apparatus. Essential oil yield was calculated in milliliters per square meter based on the essential oil content. The results showed that the highest essential oil content and yield of both shoots and flowers belonged to the 300 mg/l GA₃ application. Fresh and dry weight of leaves and stem attained their highest quantities at 300 mg/l GA₃ application as well. In contrast, there was significant difference between treatments regarding flowering stalk (inflorescence) fresh and dry weight and the greatest amount for this trait was recorded in the control. GA₃ application at 300 mg/l significantly (P<0.05) affected flower bearing plants and the highest number for this trait belonged to the highest level of GA₃ i.e. 300 mg/l. Like with many of traits, the maximal plant height was also belonged to T4 treatment. Overally, considering the whole results it seems that 300 mg/l GA₃ was the most appropriate treatment for foliar spray of lavender plants regarding growth characteristics, essential oil content and yield.
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h�f `-_ le='mso-spacerun:yes'>  T<sub>2</sub>،  200 میلی­گرم در لیتر=   T<sub>3</sub>و300 میلی گرم در لیتر=T<sub>4</sub>) و تیمار پاششی حاصل از قرص جیبرلین ((T<sub>5</sub> به علاوه تیمار شاهد (T<sub>1</sub>) بود. اسانس شاخساره و گل آذین با استفاده از کلونجر استخراج و عملکرد آن در اندام­های فوق الذکر بر حسب میلی­لیتر به متر مربع محاسبه گردید. نتایج نشان دادند بیشترین محتوا و عملکرد اسانس در تیمار 300 میلی­گرم در لیتر اسید جیبرلیک بدست آمد. وزن تر و خشک برگ­ها و ساقه در تیمار 300 میلی گرم در لیتر بیشترین مقدار بود. از لحاظ وزن­تر و خشک گل­آذین اختلاف بین تیمارها معنی­دار بود و بیشترین مقدار در تیمار شاهد مشاهده گردید. از نظر تعداد گیاهان گل دهنده اختلاف معنی­داری بین تیمارها دیده شد و بیشترین تعداد گیاهان گل دهنده مربوط به تیمار 300 میلی گرم در لیتر اسید جیبرلیک بود. ارتفاع گیاهان نیز در تیمار 300 میلی گرم در لیتر اسید جیبرلیک به حداکثر رسید. بنابراین افزایش غلظت اسید جیبرلیک به عنوان تنظیم کننده رشد گیاهی تا 300 میلی­گرم هم باعث افزایش محتوا و هم عملکرد اسانس اسطوخودوس گردید.  43: Q���
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