یافته علمی:تاثیرنوسانات شوری بر میزان رشد، زیتوده و رنگدانه کلروفیل a و کارتنوئید ریزجلبک Nannochloropsis oculata

نویسندگان

1 دانشگاه آزاد اسلامی واحد بندرعباس3

2 پژوهشکده اکولوژی خلیج فارس و دریای عمان، بندرعباس

3 دانشگاه آزاد اسلامی واحد بندرعباس

چکیده

ریزجلبک­ها در ابتدای زنجیره غذایی آبزیان دریایی قرار دارند و از ضروریات غذایی سالن­های تکثیر آبزیان مختلف دریایی از جمله دو کفه­ای­­ها، نرم­تنان، مراحل لاروی سخت پوستان و مراحل اولیه رشد برخی ماهی­ها هستند. ریزجلبک­ها همچنین برای تولید زئوپلانکتون­ها ( کوپه ­پودا، روتیفر، آرتمیا) ضروری هستند(Gent, 2001).یکی ازمشهورترین گونه­های جلبک مورد استفاده در آبزی‌پروری عبارت است از Nannochloropsis oculata که رایج‌ترین ریزجلبک مورد استفاده برای تولید زئوپلانکتون ها (روتیفر ) می باشد (.(Heasman, et al., 2000یکی از مهمترین عوامل برای کشت ریزجلبک شوری است که برای به دست آوردن بیشترین مقدار تولید، بهتر است ریزجلبک در دامنه شوری به نسبت کم پرورش داده شوند.یکی ازکاربردهای اصلی ریزجلبک‌ها در زمینه آبزی‌پروری، مربوط است به تهیه مواد مغذی یا مکمل ها و مصرف تازه به تازه آنها (به عنوان صرفا" مکمل یا ماده افزودنی به تغذیه اصلی )و یا برای رنگدار کردن گوشت ماهی آزاد و تحریک دیگر فعالیت های موجودات است (آذری تاکامی و چرمهینی1390). یکی از جذاب‌ترین ویژگی‌های موجودات آبزی رنگ آنها می‌با‌شد که منبع رنگی آنها از مواد غذایی موجود در محیط زیست آنهامی­باشد (Durmaz, 2008 & Kop). ریزجلبک­ها حاوی رنگدانه­های زیادی مثل کلروفیل (از5/0 تا 1 درصد وزن خشک آنها) و کارتنوئیدها (به طور متوسط 1/0 وزن خشک آنها) می باشند                       

کلیدواژه‌ها


عنوان مقاله [English]

Study on the effect of salinity changes on growth, biomass, and chlorophyll a and carotenoid pigments of microalgae Nannochloropsis oculata

نویسندگان [English]

  • M Rahimisuruee 1
  • K Rohani Ghadikolaei 2
  • F Mohammadizade 3
چکیده [English]

In this study the effect of different salinities on growth, biomass and pigments of Chlorophyll a and Carotenoid were tested to determine an appropriate salinity to produce maximum growth, biomass and carotenoids of microalgae (N.oculat).Therefore, the 2-liter flask contains microalga under different levels of salinities (20, 25, 32, 35, 50 ppt), and under laboratory conditions( temperature 25-22 ° C, PH. 8, and light period of 12 h light and 12 h darkness) were cultured for 14 days. The results of present study indicate that The maximum growth of microalgae (72.63×106cell ml–1) and the maximum  specific growth rate of microalgae        (0.33 d⁻1) included in treatments with salinity of 25 and 30 ppt, that had a significant difference with the other treatments (p<0.05) .The maximum dry weight (0.022 g/lit) and amount of chlorophyll a (3.92 mg lit)  was  recorded  in treatments with salinity of 30 ppt and shows significant difference with the other treatment (p<0.05). The Minimum amount of carotenoids (0.41 mg lit) was related to treatment with salinity of 50 ppt. shows a significant difference with other treatments (p<0.05).According to the results we can say that microalgae resistant to high salinity and a wide range of salinity has the ability to grow and produce carotenoids.

کلیدواژه‌ها [English]

  • Salinity
  • Chlorophyll a
  • carotenoid
  • Growth
  • Nannochloropsis oculata
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