تأثیر محلول پاشی متیل جاسمونات بر برخی خصوصیات مورفوفیزیولوژیکی و میزان جذب سرب در گیاه دارویی ریحان (.Ocimum basilicum L) تحت تنش سرب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد

2 مرکز تحقیقات گیاهان دارویی، دانشگاه آزاد اسلامی واحد شهرقدس، تهران

3 گروه علوم خاک، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد

چکیده

سرب به‏ عنوان یک فلز سنگین و آلاینده شیمیایی پایدار از طریق منابع مختلف مصنوعی و طبیعی سلامت محیط زیست و موجودات زنده را تهدید می‏کند. به منظور بررسی اثر متقابل متیل‌جاسمونات و تنش سرب بر خصوصیات رشدی، جذب و تجمع این عنصر و تعیین شاخص خطرپذیری در گیاه ریحان پژوهشی گلدانی به ‏صورت فاکتوریل در قالب طرح کاملا تصادفی در گلخانه تحقیقاتی دانشگاه فردوسی مشهد انجام گرفت. تیمارهای آزمایش شامل سه سطح نیترات سرب (صفر، 200 و 400 میلی‌گرم در کیلوگرم خاک) و محلول‌پاشی متیل‌جاسمونات در سه غلظت (صفر، 0.5 و 1 میلی‌مولار) بود. نتایج مقایسه میانگین داده ‏ها حاکی از کاهش تمامی صفات مورفولوژی مورد مطالعه و افزایش میزان سرب برگ و ریشه گیاه و افزایش شاخص خطرپذیری با افزایش سطوح تنش سرب بود و محلول‌پاشی متیل جاسمونات تا حدودی توانست برخی از این صفات را بهبود بخشد. به‏ طوری که محلول‏ پاشی متیل‌جاسمونات با غلظت 1 میلی‏ مولار سبب افزایش 6.01 درصدی طول گل‌آذین و به‏ ترتیب سبب کاهش 96.56 و 79.31 و 99.20 درصدی میزان سرب برگ و ریشه و شاخص خطرپذیری گردید، در حالی که با غلظت 0.5 میلی ‏مولار به‏ ترتیب موجب افزایش 27.66 و 9.84 درصدی تعداد شاخه‌فرعی و وزن تر اندام هوایی گردید. بنابراین به ‏نظر می‏رسد کاربرد متیل جاسمونات در شرایط تنش‏زا توانسته تاحدودی صفات گیاه را بهبود بخشد و از آنجایی که در برخی موارد غلظت 1 میلی‏ مولار آن سبب کاهش برخی صفات مورفولوژی گیاه گردید لذا کاربرد آن با سطح 0.5 میلی‏ مولار در شرایط تنش سرب قابل توصیه می‏باشد.

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دوره 13، شماره 4
سیاست دسترسی آزاد
دی 1399
صفحه 1329-1344
  • تاریخ دریافت: 18 اردیبهشت 1398
  • تاریخ بازنگری: 10 شهریور 1398
  • تاریخ پذیرش: 12 اردیبهشت 1398
  • تاریخ اولین انتشار: 01 آذر 1399