اثر بیوچار و نانوذرات اکسید منیزیم بر کیفیت روغن و ویژگی‌های بیوشیمیایی گلرنگ در شرایط تنش شوری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان ایلام، سازمان تحقیقات، آموزش و ترویج کشاورزی، ایلام، ایران

2 گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه مراغه، مراغه، ایران

10.22034/plant.2024.142398.1132

چکیده

مقدمه: گلرنگ (Carthamus tinctorius L.) یکی از منابع مهم روغن گیاهی است که تحت تنش شوری، کاهش معنی‌دار در عملکرد دانه و تغییر ترکیب اسیدهای چرب روغن را تجربه می‌کند. در سال‌های اخیر، استفاده از اصلاح‌کننده‌های خاک مانند بیوچار و کاربرد نانوذرات فلزی به‌عنوان راهبردهای نوین مدیریتی برای کاهش اثرات تنش‌های محیطی مورد توجه قرار گرفته است. لذا مطالعه حاضر با هدف ارزیابی اثرات انفرادی و ترکیبی بیوچار و نانوذرات اکسید منیزیم بر رشد، سیستم‌های دفاع آنتی‌اکسیدانی، تولید دانه و ترکیب اسیدهای چرب گلرنگ تحت سطوح مختلف شوری انجام شد.
مواد و روش‎‌ها: این مطالعه به‌صورت فاکتوریل بر پایه طرح کاملاً تصادفی (CRD) با سه تکرار در گلخانه تحقیقاتی دانشکده کشاورزی دانشگاه مراغه در سال 1401  اجرا شد. فاکتور اول تنش شوری با سه سطح صفر، 50 و 100 میلی‌مولار کلرید سدیم و فاکتور دوم شامل چهار تیمار محرک رشد (شاهد، بیوچار، 100 میلی‌گرم در لیتر نانواکسید منیزیم و ترکیب بیوچار + نانوذرات اکسید منیزیم) بود.
نتایج: نتایج نشان داد که افزایش شوری موجب کاهش معنی‌دار ارتفاع گیاه، عملکرد دانه، درصد و عملکرد روغن گلرنگ شد، به‌طوری‌که بیشترین کاهش در سطح 100 میلی‌مولار کلرید سدیم مشاهده گردید. همزمان، افزایش معنی‌دار مالون‌دی‌آلدئید و پراکسید هیدروژن نشان‌دهنده تشدید تنش اکسیداتیو و پراکسیداسیون لیپیدی در شرایط شوری بود که بیانگر آسیب به غشاهای سلولی و اختلال در پایداری ساختارهای زیستی است. با این حال، کاربرد بیوچار و نانوذرات اکسید منیزیم، به‌ویژه به‌صورت ترکیبی، توانست این اثرات منفی را به‌طور قابل توجهی تعدیل کند. در شرایط شوری ملایم (50 میلی‌مولار)، تیمار ترکیبی موجب افزایش محتوای فنل (7/109 درصد) و فلاونوئید (9/123 درصد) نسبت به شاهد شد که نشان‌دهنده تقویت سیستم دفاع غیرآنزیمی گیاه است. همچنین، افزایش فعالیت آنزیم‌های آنتی‌اکسیدانی شامل سوپراکسید دیسموتاز (4/130 درصد)، گایاکول پراکسیداز (3/116درصد) و پراکسیداز (648 درصد) بیانگر فعال‌سازی مؤثر سیستم دفاع آنزیمی در مقابله با گونه‌های فعال اکسیژن بود. علاوه­بر این، کاهش معنی‌دار MDA و H₂O₂ در تیمار ترکیبی نسبت به شاهد، نشان داد که هم‌افزایی بیوچار و نانوذرات اکسید منیزیم توانسته است از پراکسیداسیون لیپیدی جلوگیری کرده و یکپارچگی غشاها را حفظ کند. از نظر عملکردی، بیشترین تولید دانه و روغن در شرایط بدون تنش و با تیمار ترکیبی مشاهده شد که نسبت به تنش شدید بدون محرک­های رشد به‌ترتیب 3/101 و 5/196 درصد افزایش نشان داد. بهبود ترکیب اسیدهای چرب، به‌ویژه افزایش لینولئیک (2/74 درصد) و لینولنیک اسید (5/93 درصد)، بیانگر حفظ مسیرهای بیوسنتزی اسیدهای چرب غیراشباع در شرایط بهبود یافته تغذیه‌ای و کاهش تنش اکسیداتیو است. از آنجا که شوری معمولاً موجب کاهش اسیدهای چرب غیراشباع و کاهش کیفیت روغن می‌شود، بهبود این شاخص‌ها در تیمار ترکیبی حاکی از اثر حفاظتی این رویکرد بر متابولیسم لیپیدی است.
نتیجه‌گیری: استفاده هم‌زمان از بیوچار و نانوذرات اکسید منیزیم توانست اثرات منفی تنش شوری بر رشد، عملکرد و کیفیت روغن گلرنگ را به‌طور قابل توجهی کاهش دهد. این تیمار علاوه بر ارتقای صفات عملکردی، کیفیت روغن را از طریق افزایش اسیدهای چرب غیراشباع بهبود داد. بنابراین، ترکیب بیوچار و نانوذرات اکسید منیزیم می‌تواند به‌عنوان یک راهکار مدیریتی مؤثر برای تولید پایدار گلرنگ در اراضی شور مورد استفاده قرار گیرد و توسعه فناوری‌های نوین مبتنی بر اصلاح‌کننده‌های آلی و نانوکودها را برای افزایش تحمل گیاه به تنش شوری ممکن سازد.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of biochar and magnesium oxide nanoparticles on oil quality and biochemical characteristics of safflower under salinity stress conditions

نویسندگان [English]

  • Mohammad Haghaninia 1
  • ali najafifar 1
  • Freidoon Soleimani 1
  • amir Mirzaei 1
  • Abdollah Javanmard 2
1 Agricultural and Natural Resources Research and Education Center of Ilam Province, Agricultural Research, Education, and Extension Organization (AREEO), Ilam, Iran
2 Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh,, Maragheh, Iran
چکیده [English]

Introduction: Safflower (Carthamus tinctorius L.) is a key oilseed crop widely grown in semi-arid regions, where soil salinity is a major obstacle to productivity and oil quality. Recently, the use of soil amendments such as biochar and metal-based nanoparticles has gained popularity as an innovative approach to reducing environmental stresses in sustainable agriculture. Thus, this study aimed to assess both the individual and combined impacts of biochar and MgO-NPs on growth performance, antioxidant defense systems, seed yield, and fatty acid composition of safflower across salinity levels.
Materials and Methods: This study was conducted as a factorial trial using a completely randomized design (CRD) with three replications at the research greenhouse of the Faculty of Agriculture, University of Maragheh, Iran in 2022. The first factor included salinity stress at three levels (0, 50, and 100 mM NaCl), while the second factor involved four growth-promoting treatments: control (no amendment), biochar, magnesium oxide nanoparticles (100 mg/L), and the combined application of biochar plus MgO-NPs.
Results: Salinity stress notably decreased plant height, seed yield, oil percentage, and oil yield, with the largest reductions seen at 100 mM NaCl. Simultaneously, significant increases in MDA and H₂O₂ were observed under saline conditions, indicating heightened ROS accumulation and membrane lipid peroxidation, which reflect structural damage to cellular membranes and metabolic issues. In contrast, applying biochar and MgO-NPs, especially together, significantly alleviated salinity-related damage. Under moderate salinity (50 mM NaCl), the combined treatment increased total phenolic and flavonoid contents by 109.7% and 123.9%, respectively, compared to the untreated control, suggesting activation of the non-enzymatic antioxidant defense system. Similarly, activities of superoxide dismutase, guaiacol peroxidase, and peroxidase increased by 130.4%, 116.3%, and 648%, respectively, demonstrating strong activation of enzymatic ROS-scavenging processes. The notable decrease in MDA and H₂O₂ levels with the combined treatment further confirmed its effectiveness in reducing oxidative damage and maintaining membrane stability. The excellent performance of the combined approach likely resulted from complementary mechanisms. Biochar enhanced soil structure, improved nutrient retention, and lowered Na⁺ bioavailability in the rhizosphere, while MgO-NPs supplied bioavailable magnesium crucial for chlorophyll stability, ATP-driven metabolic functions, and activation of antioxidant enzymes. From an agricultural perspective, the highest seed and oil yields were observed under non-saline conditions with the combined amendment, showing increases of 101.3% and 196.5%, respectively, compared to severe salinity without growth-promoting treatments. Additionally, linoleic and linolenic acid contents rose by 74.2% and 93.5%, respectively, under the combined treatment, indicating the preservation of unsaturated fatty acid synthesis pathways despite improved nutritional and oxidative conditions. Since salinity often decreases the proportion of unsaturated fatty acids and harms oil quality, these results emphasize the protective effect of the combined amendment in maintaining lipid metabolism.
Conclusion: The combined use of biochar and magnesium oxide nanoparticles effectively reduced the harmful effects of salinity stress on safflower growth, yield, and oil quality. In addition to enhancing agronomic traits, this integrated treatment improved oil quality by increasing the amount of unsaturated fatty acids. Therefore, the co-application of biochar and magnesium oxide nanoparticles can be considered a valuable management strategy for sustainable safflower production in saline soils and may foster the development of organic soil amendments and nano-fertilizer technologies aimed at boosting plant tolerance to salinity stress.

کلیدواژه‌ها [English]

  • Abiotic stresses
  • Flavonoids
  • Fatty acids
  • Nanoparticlesو Sustainable agriculture
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