اثر محلول‌پاشی اسید آسکوربیک بر ویژگی‌های اکوفیزیولوژیکی پریوش (Catharanthus roseus) تحت تنش کمبود آب

Subject Areas : Journal of Ornamental Plants

علی حسینی ¹

1 - گروه کشاورزی، واحد آستارا، دانشگاه آزاد اسلامی، آستارا، ایران

Received: 2022-09-15 Accepted : 2022-09-19 Published : 2022-12-01

Keywords: تنش خشکی, کاتالاز, وزن خشک, اسید آسکوربیک, گیاهان زینتی و دارویی,

Abstract :

آب یکی از مهم‌ترین عوامل محیطی تنظیم کننده رشد و نمو گیاهان است و کمبود آب مهمترین عامل محدودکننده تولیدات گیاهی به‌شمار می‌رود، به­ طوری که از چندین ماده شیمیایی برای کاهش اثرات مضر کمبود آب استفاده شده است. یکی از این ترکیبات  اسید آسکوربیک است و دارای اثرات آنتی­ اکسیدانی در گیاهان می‌باشد. به­ همین منظور یک آزمایش گلدانی به صورت فاکتوریل در قالب طرح پایه کاملاَ تصادفی با سه تکرار جهت بررسی اثر کمبود آب بر خصوصیات مورفولوژیک و فیزیولوژیک پریوش تحت محلول‌پاشی اسید آسکوربیک، در سال 1399 انجام شد. فاکتورهای آزمایش شامل: تنش کمبود آب در چهار سطح (1: بدون تنش آبیاری در100 درصد ظرفیت مزرعه؛ 2: تنش ملایم آبیاری در 75 درصد ظرفیت مزرعه؛ 3: تنش متوسط آبیاری در 50 درصد ظرفیت مزرعه و 4: تنش شدید آبیاری در 25 درصد ظرفیت مزرعه) و محلول‌پاشی اسید آسکوربیک در چهار سطح (صفر، ۲۵، ۵۰، 100 میلی‌مولار) بودند. نتایج به‌دست آمده نشان داد که غلظت کلروفیل a و کاروتنوئید، قند محلول برگ، مقدار پرولین و فعالیت آنزیم کاتالاز با افزایش شدت کمبود آب افزایش یافت ولی صفات وزن خشک ریشه و بیومس کل کاهش یافتند. کاربرد اسید آسکوربیک منجر به بهبود صفات اندازه‌گیری شد و سطوح کاربرد اسید آسکوربیک نسبت به عدم کاربرد آن برتری معنی‌دار داشت و سطح 50 میلی‌مولار نسبت به سایر سطوح، تاثیر بیشتری، در اغلب صفات، داشت. با توجه به نتایج بدست آمده، کاربرد اسید آسکوربیک برای بهبود رشد گیاهانی مانند پریوش تحت تنش خشکی قابل توصیه می‌باشد.

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