بررسی اثر غلظت‌های مختلف سیلیکون بر برخی پارامتر¬های رشد و فیزیولوژیکی گیاه کلزا (Brassica napus L.) تحت تنش آرسنیک و کادمیوم
الموضوعات :
ناصر کریمی
1
,
سلیمه خادمی اعظم
2
,
زهرا سوری
3
1 - گروه زیست شناسی، دانشکده علوم، دانشگاه رازی، کرمانشاه، ایران.
2 - گروه زیست شناسی، دانشکده علوم، دانشگاه رازی، کرمانشاه، ایران
3 - گروه زیست شناسی، دانشکده علوم، دانشگاه رازی، کرمانشاه، ایران
الکلمات المفتاحية: آنتی اکسیدان, سیلیکون, فلزات سنگین, کادمیوم, مقاومت ,
ملخص المقالة :
سیلیکون به عنوان دومین عنصر فراوان در خاک و پوسته زمین، می‌تواند رشد گیاهان را افزایش داده و موجب بهبود تنش‌های مختلف از جمله تنش فلزات سنگین گردد. به منظور بررسی اثر سیلیکون بر برخی پارامترهای رشد و فیزیولوژیکی گیاه کلزا تحت تنش آرسنیک و کادمیوم دو آزمایش مستقل به صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار انجام شد. در این پژوهش گیاهان پس از رسیدن به مرحله‌ی چهار برگی به مدت 14 روز تحت اثر تیمارهای آرسنیک و کادمیوم با غلظت 600 میکرو مولار و سیلیکون با غلظت‌های صفر، 5/0، 1 و2 میلی‌مولار قرار گرفتند. اعمال تنش کادمیوم و آرسنیک به طور معنی داری پارامتر های رشد گیاه و محتوای کلروفیل کل را کاهش داد. از سوی دیگر در مقایسه با تیمار حاوی آرسنیک و یا کادمیوم، کاربرد سیلیکون باعث بهبود پارامترهای رشد و محتوی کلروفیل گردید. همچنین کاربرد سیلیکون منجر به افزایش محتوای کلروفیل و فعالیت آنزیم گلوتاتیون اس- ترانسفراز در بخش هوایی گیاه کلزا شد. نتایج نشان دادند که کاربرد سیلیکون می تواند مقاومت گیاه کلزا را از طریق بهبود فاکتورهای رشد و سیستم دفاعی آنتی اکسیدانی به ویژه تحت تنش کادمیوم بهبود بخشد. بنابراین می‌توان از سیلیکون جهت بهبود رشد و افزایش مقاومت این گیاه در شرایط تنش فلزات سنگین به ویژه تنش کادمیوم استفاده کرد.
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