Priming with L-arginine reduces oxidative damages in Carthamus tinctorius seedlings under the toxic levels of lead

Document Type : Research Paper


1 Department of Biology, Shahid Bahonar University of Kerman, Kerman, Iran.

2 Agricultural and Natural Resources Research and Education Center, Kerman, Iran.

3 Department of Biotechnology, Institute of Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.


Lead (Pb) stress adversely affects plant nutrient homeostasis and metabolism when present at an elevated concentrations in the surrounding media. In this research, the effects of 1mM Pb(NO3)2 on 14-day-old Carthamus tinctorius seedlings pretreated with arginine (Arg) as nitric oxide (NO) precursor, methylene blue (MB), a nitric oxide scavenger and Nω-nitro-L-Arg-methyl ester (LNAME) and a nitric oxide biosynthetic inhibitor, were investigated in the greenhouse of the Department of Biology, Shahid Bahonar University of Kerman, Iran. Pb exposure caused oxidative stress, reduced root and shoot growth and elevated malondialdehyde (MDA) content of the seedlings. Pb stress also increased the ascorbate peroxidase activity while decreasing the activity of the catalase (CAT) enzyme. Arg pretreatment decreased the harmful effects of Pb stress by increasing the root and shoot length and reducing the MDA content. Additionally, Pb-induced reduction of CAT enzyme activity in roots was reversed by the Arg pretreatment of the plants. In many characteristics which we measured, the effects of Arg pretreatment on alleviation of Pb-induced oxidative stress were reversed by LNAME and methylene blue pretreatments. Therefore, it seems that Arg induces a positive effect through NO production. Data showed that in the presence of Arg, the uptake and translocation of Pb declined and the application of Arg with LNAME or MB reversed these positive effects of Arg.  It seems that Arg can alleviate lead toxicity in plants through the prevention of Pb uptake and promoting the direct scavenging of reactive oxygen species or activating antioxidant enzymes. Also, results from the use of LNAME and MB indicated that the positive effect of Arg is probably related to its role in NO production.


Article Title [فارسی]

استفاده از ال-آرژنین به منظور کاهش آسیب های اکسیداتیو در گیاهچه های گلرنگ تحت سطوح سمی سرب

Authors [فارسی]

  • فاطمه نصیبی 1
  • منصوره خداشناس 2
  • ناهید نصیبی 3
1 - بخش زیست شناسی دانشکده علوم پایه، دانشگاه شهید باهنر کرمان، کرمان.
2 مرکز تحقیقات کشاورزی و منابع طبیعی استان کرمان، کرمان.
3 گروه بیوتکنولوژی، پژوهشکده علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان.
Abstract [فارسی]

تنش سرب هنگامی که با غلظت بالا در محیط اطراف وجود دارد، بر هموستاز و متابولیسم مواد مغذی گیاه تأثیر منفی می­ گذارد. در این تحقیق اثر تیمار نیترات سرب با غلظت 1 میلی مولار بر گیاهچه ­های 14 روزه گلرنگ، پیش تیمار شده با آرژنین به عنوان پیش ساز نیتریک اکساید، متیلن بلو (MB)،  جاروبگر نیتریک اکساید، و ان- نیترو- ال آرژنین متیل استر(LNAME) ، ممانعت کننده بیوسنتز نیتریک اکساید، در گلخانه گروه زیست شناسی دانشگاه شهید باهنر کرمان مورد مطالعه قرار گرفت.  تیمار سرب موجب ایجاد تنش اکسیداتیو، کاهش رشد ریشه و ساقه و افزایش محتوای مالون دی­آلدئید (MDA) در گیاهچه ­ها شد. تنش سرب همچنین فعالیت آنزیم آسکوربات پراکسیداز را افزایش و فعالیت آنزیم کاتالاز (CAT) را کاهش داد. پیش تیمار آرژنین با افزایش طول ریشه و ساقه و کاهش محتوای MDA موجب کاهش اثرات زیانبار تنش سرب شد. علاوه بر این، پیش تیمار آرژنین اثر سرب بر فعالیت آنزیم CAT در ریشه گیاهان را بهبود بخشید.  در بسیاری از متغیرهای مورد اندازه­ گیری، MB و LNAME اثر تعدیلی پیش تیمار آرژنین را خنثی کردند. بنابراین، به نظر می­ رسد آرژنین از طریق تولید نیتزیک اکساید موجب بروز اثرات مثبت در گیاهچه­ ها شده است. تجزیه داده­ ها نشان داد که در حضور آرژنین، جذب و انتقال سرب کاهش یافته و کاربرد آرژنین با LNAME یا MB این اثرات مثبت آرژنین را خنثی می کند. به نظر می­ رسد که استفاده از آرژنین ​​می تواند از طریق جلوگیری از جذب سرب و مهار مستقیم گونه­ های فعال اکسیژن یا فعال سازی آنزیم ­های آنتی اکسیدان، سمیت سرب را کاهش ­دهد. از طرف دیگر نتایج مربوط به استفاده از LNAME و MB نشان داد که اثر مثبت آرژنین احتمالا به دلیل توانایی آرژنین در تولید نیتریک اکساید است.

Keywords [فارسی]

  • آنزیم های آنتی اکسیدان
  • عامل ترانسلوکاسیون
  • فلزات سنگین
  • نیتریک اکساید
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