تأثیر تزریق دی‌اکسیدکربن به محیط ریشه بر رشد و تجمع نیترات در دو رقم کاهوی پیچ و فر ((Lactuca sativa L. cv. Capitata and Sativa

نوع مقاله : مقالات پژوهشی

نویسندگان

دانشگاه تبریز

چکیده

نیترات یکی از ترکیبات اساسی برای گیاهان است و سبزی ها منبع بسیار مهم نیترات برای انسان هستند. تخمین زده می شود که سبزی ها 92 درصد نیترات انسان را تأمین کنند. اثرات مثبت و منفی بالا رفتن غلظت دی اکسیدکربن (CO2) محیط ریشه روی رشد و عملکرد گیاهان گزارش شده است. بنابراین برای بررسی تأثیر دی اکسیدکربن محیط ریشه روی رشد و میزان تجمع نیترات در کاهو این مطالعه انجام شده است. این آزمایش در قالب طرح کاملاً تصادفی با چهار سطح CO2 (0، 200، 400، 600 میلی‌لیتر در دقیقه) و با پنج تکرار روی دو رقم کاهو به نام کاهوی پیچ سبز کنیا و کاهوی فر قرمز ورسای اجرا شد. این آزمایش در سیستم فلوتینگ اجرا شد که در این آزمایش اکسیژن محیط ریشه توسط پمپ هوا تامین می-شود. نتایج حاصل از آزمایش نشان می دهد که تزریق دی اکسیدکربن به محیط ریشه کاهو اثر معنی داری بر وزن تر و وزن خشک برگ، ریشه و ساقه گیاهان تیمار شده نسبت به گیاهان شاهد دارد. با افزایش میزان CO2 ورودی به محیط ریشه وزن تر و خشک برگ، ساقه و ریشه در هر دو رقم افزایش یافت. کارآیی فتوسنتز هر دو رقم پیچ سبز کنیا و فر قرمز ورسای در تیمار400 میلی لیتر بر دقیقه دی اکسیدکربن محیط ریشه بیشترین مقدار خود را نشان داد. نیترات موجود در برگ های دو رقم کاهو تحت تأثیر دی اکسیدکربن محیط ریشه به‌طور قابل ملاحظه ای کاهش یافت. غلظت نیترات در رقم پیچ سبز در تیمار سوم بیش‌ترین کاهش معادل 27 درصد و رقم فر قرمز در تیمار چهارم بیش‌ترین کاهش معادل6/47 درصد نشان داد. نتایج نشان داد که با افزایش میزان دی اکسیدکربن ورودی به محیط ریشه کاهو میزان فعالیت آنزیم نیترات ردکتاز در هر دو رقم پیچ سبز و فر قرمز افزایش یافت که در تیمار 400 میلی لیتر بر دقیقه دی اکسیدکربن بیش‌ترین مقدار را نشان داد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Carbon Dioxide Injection to Root Zone on the Growth and Nitrate Accumulation in Two Cultivars of Lettuce (Lactuca sativa L. cv. Capitata and Sativa)

نویسندگان [English]

  • M. rahmnpourazar
  • S.J. tabatabaei
  • S.A. bolandnazar
University of Tabriz
چکیده [English]

Nitrate is an essential component for plants and vegetables are of the most important source of nitrate for human being. It is estimated that vegetables provide 92 % of nitrate for human nutrition. The positive and negative effects of elevated root zone CO2 on growth and yield of some plants have been reported. This study has been conducted in order to examine the effect of root zone CO2 on growth and nitrate accumulation in lettuce. The experiment was conducted as a completely randomized design with four levels of CO2 (0, 200, 400 and 600 ml per minute) and with five replication on two cultivars of lettuce (Sativa and Capitata). The study performed in floating system and aeration was supplied by air pump. The results showed that injection of CO2 had significant effect on the fresh and dry weight of leaves, stems and roots of plants. By increasing the concentration of CO2 fresh and dry weight of leaves, stems and roots increased in both cultivars. Photosynthesis efficiency increased in both cultivars in the treatment of 400 ml/min root zone CO2. The influence root zone CO2 significantly decreased nitrate content in leaves of lettuce. Nitrate concentration in the leaves of lettuce was decreased by injection of root zone CO2 in L.sativa. var. Capitata in the treatment of 400 ml/min and in L.sativa. var Sativa in the treatment 600 ml/min. respectively by 27% and 47.6%. With increasing input root zone CO2 increased activity of nitrate reductase enzyme in both cultivars that showed highest content in treatment 400 ml/min.

کلیدواژه‌ها [English]

  • CO2
  • Nitrate
  • Nitrate Reductase
  • Photosynthetic Efficiency
  • Lettuce
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