Can Super Absorbent Polymer Improve the Water-Deficit Tolerance of Young Myrtle Plants?
محورهای موضوعی : مجله گیاهان زینتیSomayeh Esmaeili 1 , Abbas Danaeifar 2
1 - Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz
2 - Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz
کلید واژه: starch, Photosynthesis, Myrtus communis L, Keywords: A200 polymer, Woody plants,
چکیده مقاله :
Water scarcity is a serious problem affecting young plants' growth, development, and establishment. Superabsorbent polymers (SAPs) have revealed an excellent capacity to absorb and retain water, increase soil moisture, and improve the growth of plants under water shortage. A greenhouse study was performed with three irrigation regimes (50%, 75%, and 100 % FC) and three levels of SAP-A200 (0, 1, and 2 g kg-1 soil) in a factorial experiment based on a completely randomized design with four replications. The results showed that soil water deficit affected physiological and biochemical characteristics of young myrtle plants. Photosynthetic parameters, total chlorophyll, and relative water content (RWC) decreased by increasing water-deficit stress. In contrast, leaf electrolyte leakage (EL), malondialdehyde (MDA), total soluble sugars (TSSs), and starch, increased. However, the application of minimal amounts of SAP (1 and 2 g kg-1 soil) improved most of these characteristics in both well-watered and water-deficit conditions, it appears that a higher amount of SAP is needed in moderate and severe water stress conditions. Therefore, SAP-A200 can be utilized as an efficient and economical method for rapidly establishing woody young plants in low-water areas.
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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