تأثیر تیمارهای روی و پتاسیم بر فعالیت‌های‎ آنتی‎اکسیدانی و پاسخ‎های فیزیولوژیک کلزا در خاک شور

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی خاک دانشگاه تهران، دانشگاه زنجان

2 گروه علوم و مهندسی خاک، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

3 گروه زراعت و اصلاح نباتات دانشگاه تهران

چکیده

تنش شوری یکی از عوامل تأثیرگذار بر محصولات کشاورزی در مناطق خشک جهان است. در این شرایط تأثیر تیمارهای کودی پتاسیم و روی بر تولید گونه‎های فعال اکسیژن طی پژوهشی به‎صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه عامل (رقم، کود و زمان) و سه تکرار در گلخانه بررسی شد. نتایج نشان دادند که کاربرد تیمار پتاسیم در رقم ساری‎گل و لیکورد موجب افزایش به‎ترتیب %1/49 و %4/14 فعالیت آنزیم سوپراکسید دیسموتاز (SOD) نسبت به سایر تیمارهای کودی شد. از طرفی کاربرد این تیمار کودی فعالیت آنزیم گایاکول پراکسیداز (GPX) را در رقم ساری‎گل و لیکورد به‎ترتیب %7/50 و %2/62 نسبت به سایر تیمارهای کودی افزایش داد. بیشترین فعالیت آنزیم SOD و GPX در مرحله قبل از گلدهی بود که نسبت به مرحله گلدهی به ترتیب %6/18 و %6/32 و نسبت به مرحله بعد از گلدهی به‎ترتیب %9/44 و %1/26 فعالیت بیشتری را نشان دادند. هم‎چنین با مصرف کودهای پتاسیمی، محتوای نسبی آب در ارقام ساری‎گل و لیکورد به‎ترتیب حداقل به میزان %9/7 و %35/0 افزایش یافت. رقم ساری‎گل نسبت به لیکورد در ریشه و بخش هوایی به‎ترتیب به میزان %79/1 و %9/18 جذب پتاسیم کمتری داشت. بین دو رقم، ساری‎گل به‎عنوان رقمی متحمل به شوری است و از جمله مراحل حساس رشد آن، مرحله قبل از گلدهی است که می‎توان با مصرف کودهای پتاسیمی در این مرحله، به میزان زیادی از اثر تنش کاست.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Zinc and Potassium Treatments on the Antioxidant Activities and Physiological Responses of Canola in a Saline Soil

نویسندگان [English]

  • Nader Khadem Moghadam 1
  • Babak Motesharezadeh 2
  • Reza Maali amiri 3
1 Soil Science, University of Tehran
2 Soil Science Department, University of Tehran
3 Department of Agronomy, University of Tehran
چکیده [English]

Salinity stress is one of the factors that affect the agricultural productions in the arid regions in the world. In this condition, the effect of potassium and zinc fertilizer treatments on the production of reactive oxygen species were investigated in a completely randomized design with three factors (fertilizer, cultivar, and time) and three replications in a greenhouse. The results showed that the application of potassium treatment in Sarigol and Licord cultivars increased SOD activity 49.1% and 14.4% respectively, as compared to the other fertilizer treatments. On the other hand, the application of this fertilizer increased the activity of GPX enzyme in Sarigol and Licord cultivars 50.7% and 62.2% compared to the other fertilizer treatments, respectively. The highest activities of SOD and GPX were in pre-flowering stage which showed 18.6 and 32.6% increasing related to flowering stage and 44.9 and 26.1% increasing related to post-flowering stage, respectively. Also, the relative water content of Sarigol and Licord cultivars increased by at least 7.9 and 0.35%, respectively, using potassium fertilizers. Sarigol cultivar had less potassium uptake than Licord cultivar in the root and shoot by 1.79% and 18.9%, respectively. Sarigol is a salt tolerant cultivar and sensitive in pre-flowering stage in which the consumption of potassium fertilizer can reduce the effect of salinity stress.

کلیدواژه‌ها [English]

  • guaiacol peroxide
  • Licord
  • Salinity stress
  • Sarigol
  • superoxide dismutase
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