تاثیرفلزات سنگین ( کادمیوم و سرب) بر رشد، محتوای رنگیزه‌های فتوسنتزی و پروتئین ریزجلبک Isochrysis galbana

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زیست شناسی دریا، دانشکده علوم وفنون دریا، دانشگاه هرمزگان، بندرعباس، ایران

10.22034/aej.2021.295825.2588

چکیده

فلزات سنگین به علت اثرات سمی در محیط، تجمع زیستی در گونه‌های مختلف آبزیان و ایجاد بزرگ نمایی زیستی در زنجیره‌های غذایی از اهمیت ویژه‌ای برخوردار هستند. مطالعه حاضر با هدف مقایسه سمیت فلزات سنگین کادمیوم و سرب در غلظت‌های مختلف (500، 250، 100، 50، 5 میکروگرم بر لیتر ) بر رشد ریزجلبک Isochrysis galbana در طول 15 روز در محیط کشت F2 مورد مطالعه قرار گرفت. نتایج نشان داد که اثر دو فلزات مورد مطالعه بر رشد I. galbana وابسته به دو فاکتو زمان و غلظت بود. مشاهدات حاکی از این بود که غلظت‌های 500 میکرو گرم بر لیتر از کادمیوم در روز چهارم به طور قابل توجهی باعث مهار رشد I. galbana گردید . بیش ترین میزان رشد در غلظت 5 میکرو گرم بر لیتر به برای هر دو فلز مورد آزمایش به دست آمد. در این آزمایش بیش ترین محتوای کلروفیل a برای فلزات کادمیوم و سرب مربوط به غلظت 5 میکرو گرم بر لیتر و کمترین محتوای کلروفیل مربوط به دو غلظت‌ 250 و 500 میکروگرم بر لیتر بود. هم چنین با مطالعه اثر فلز کادمیوم و سرب بر میزان پروتئین ریز جلبک مشخص گردید که غلظت‌های کم باعث افزایش میزان پروتئین و غلظت‌های بالا باعث کاهش میزان پروتئین ریزجلبک شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of heavy metals (cadmium and lead) on growth, photosynthetic pigment content and Protein microalgae Isochrysis galbana

نویسندگان [English]

  • Zohreh Barkhordari Ahmadi
  • Mohammadreza Taherizadeh
  • Morteza Yousefzadi
Department of marine biology, Faculty of marine science and technology, Universtity of Hormozgan, Bandar Abbas, Iran
چکیده [English]

Heavy metals are especially important because of the toxic effects of the environment, the accumulation of biodiversity in various aquatic species and the creation of biological magnification in food chains. The present study was conducted to compare the toxicity of heavy metals of cadmium and lead in different concentrations (500, 250, 100, 50, 5 μg/L) on microorganism growth of Isochrysis galbana during 15 days in F2 culture media. The results showed that the effect of two metals on growth of I. galbana was dependent on two factors of time and concentration. Observations showed that concentrations of 500 micrograms per liter of cadmium on day 4 significantly inhibited the growth of I. galbana. The highest growth rate was obtained at a concentration of 5 μg/L for both tested metals. In this experiment, the highest content of chlorophyll a for cadmium and lead was 5 g/L and the lowest content of chlorophyll was in two concentrations of 250 and 500 μg/L. Also, by studying the effect of cadmium and lead on the amount of alfalfa protein, low concentrations increased protein levels and high concentrations reduced the amount of microalgae protein.

کلیدواژه‌ها [English]

  • microalgae Isochrysis galbana
  • Cadmium and lead metal
  • growth
  • chlorophyll a
  • protein

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فصلنامه محیط زیست جانوری
دوره 14، شماره 3
آبان 1401
صفحه 367-376

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