اثر محلول پاشی لاکتات کلسیم بر خصوصیات فیزیولوژیکی، فعالیت آنتی اکسیدانی و عملکرد کاهو (Lactuca sativa L.) تحت شرایط کم آبیاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

2 دانشیار، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

3 استادیار، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

چکیده

به­منظور ارزیابی اثر لاکتات­کلسیم بر برخی از ویژگی­های فیزیولوژیکی، آنتی­اکسیدانی و عملکرد کاهو تحت شرایط کم­آبیاری، آزمایشی به­صورت کرت­های خرد شده بر پایه طرح بلوک­های کامل تصادفی در سه تکرار در شرایط اقلیمی زنجان در سال 1396 اجرا شد. تیمار­های آزمایش شامل سه رژیم آبیاری مختلف (100، 85 و 70 درصد نیاز آبی گیاه) به­عنوان فاکتور اصلی و محلول­پاشی لاکتات­کلسیم در سه سطح (0، 75/0 و 5/1 گرم در لیتر) به­عنوان فاکتور فرعی بودند. نتایج نشان داد که تنش کم­آبیاری به­طور معنی‌داری فعالیت آنتی­اکسیدانی و میزان پرولین، فنل، فلاونوئید و فعالیت آنزیم­های پراکسیداز و کاتالاز را افزایش داد و شاخص پایداری غشا، محتوای نسبی آب برگ، باقیمانده آب برگ و عملکرد را کاهش داد. کاربرد برگی لاکتات­کلسیم به­طور معنی­داری وضعیت آب برگ، فعالیت آنتی­اکسیدانی و عملکرد گیاه را نسبت به تیمار شاهد افزایش داد. بیشترین مقدار پرولین و فعالیت آنزیم­های کاتالاز و پراکسیداز با کاربرد لاکتات­کلسیم 5/1 گرم در لیتر در شرایط کم­آبیاری 70 درصد حاصل شد. حداکثر فعالیت آنتی­اکسیدانی تحت 75/0 گرم در لیتر و شرایط کم­آبیاری 85 درصد به­دست آمد. با توجه به نتایج، کاربرد لاکتات­کلسیم 5/1 گرم در لیتر برای بهبود وضعیت آب برگ، فعالیت آنتی­اکسیدانی آنزیمی و غیرآنزیمی و عملکرد کاهو پیشنهاد می­گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of foliar spray of calcium lactate on physiological characteristics, antioxidant activity and yield of lettuce (Lactuca sativa L.) under deficit irrigation

نویسندگان [English]

  • Arezoo Khani 1
  • Taher Barzegar 2
  • Jaefar Nikbakht 2
  • Zahra Ghahremani 3
1 Former M. Sc. Student, Department of Horticultural Sciences, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
2 Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
3 Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
چکیده [English]

In order to evaluate the effect of calcium lactate (Ca) on some physiological, antioxidant properties and yield of lettuce cv.New Red Fire under deficit irrigation, a split plot experiment based on randomized complete blocks design with three replications was conducted in Zanjan climatic conditions during 2017. Experimental treatments consisted of three different irrigation regimes (70, 85 and 100% ETc) as the main plot and calcium lactate at three levels (0, 0.75 and 1.5 g.l-1) as a sub plot. Results showed that deficit irrigation significantly increased the antioxidant activity, proline, phenol, flavonoids contents as well as peroxidase and catalase enzymes activity. In contrast, deficit irrigation reduced the membrane stability index, leaf relative water content, excised leaf water retention and yield. The foliar application of calcium lactate significantly increased plant water status, antioxidant activity and yield. The highest proline content and catalase and peroxidase enzymes activity was obtained with application of 1.5 g.l-1 Ca under deficit irrigation of 70% ETc. The maximum antioxidant activity was achieved under 0.75 g.l-1 Ca treatment and deficit irrigation of 85% ETc. According to results, application of 1.5 g.l-1 Ca can be proposed to improve plant water status, enzyme and non-enzyme antioxidant activity and yield of lettuce. 

کلیدواژه‌ها [English]

  • Antioxidant Enzymes
  • proline
  • relative water content
  • membrane stability
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