آیا پلیمر سوپر جاذب می تواند تحمل کم آبی گیاهان جوان مورد را بهبود بخشد؟
Subject Areas : Journal of Ornamental Plantsسمیه اسماعیلی 1 , عباس دانایی فر 2
1 - گروه علوم باغبانی، دانشگده کشاورزی، دانشگاه شهید چمران اهواز
2 - گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز
Keywords: فتوسنتز, نشاسته, مورد, کلمات کلیدی: A200 پلیمر, گیاهان چوبی,
Abstract :
کمبود آب یک مشکل جدی است که رشد، نمو و استقرار گیاهان جوان را تحت تأثیر قرار می دهد. پلیمرهای سوپرجاذب (SAPs) ظرفیت بسیار خوبی برای جذب و حفظ آب، افزایش رطوبت خاک و بهبود رشد گیاهان در شرایط کم آبی نشان داده‌اند. یک مطالعه گلخانه ای با سه رژیم آبیاری (50 درصد، 75 درصد و 100درصد ظرفیت زراعی (FC) و سه سطح SAP-A200 (0، 1 و 2 گرم در کیلوگرم خاک) در یک آزمایش فاکتوریل با چهار تکرار در قالب طرح کاملا تصادفی انجام شد. بر اساس نتایج، کمبود آب خاک بر ویژگی‌های مورفولوژیک، فیزیولوژیک و بیوشیمیایی گیاهان جوان مورد تأثیر گذاشت. کاهش قابل توجهی در شاخص‌های رشدی در تنش کم آبی (50 درصد FC) در مقایسه با گیاهان شاهد (100 درصد FC) مشاهده شد. پارامترهای فتوسنتزی، کلروفیل کل و محتوای نسبی آب (RWC) با افزایش تنش کم آبی کاهش یافت. در مقابل، میزان نشت یونی (EL)، مالون دی آلدئید (MDA)، قندهای محلول کل (TSS)، نشاسته و فعالیت آنزیم های آنتی اکسیدانت افزایش یافت. کاربرد مقادیر حداقل SAP (1 و 2 گرم در کیلوگرم خاک) بیشتر این ویژگی‌ها را در هر دو شرایط آبیاری خوب و کم‌آبی بهبود بخشید، به نظر می رسد در شرایط تنش های کم آبی متوسط و شدید نیاز به میزان بالاتر از SAP باشد. با این وجود، می توان ازSAP-A200 به عنوان یک روش کارآمد و اقتصادی برای استقرار سریع گیاهان جوان چوبی در مناطق کم آب استفاده کرد.
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