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Các hiệu ứng tương tác giữa điều kiện lạnh và ôn đới đối với sự phát triển và thành phần hóa sinh của vi tảo Nam Cực Chlorella variabilis YTU.ANTARCTIC.001
Tóm tắt
Mục tiêu của nghiên cứu này là tách biệt và xác định các loài vi tảo Nam Cực thu thập qua Cuộc thám hiểm Khoa học Quốc gia Nam Cực, đồng thời kiểm tra phản ứng tăng trưởng và thành phần hóa sinh của Chlorella variabilis dưới điều kiện nuôi trồng lạnh và ôn đới trong môi trường tăng trưởng bao gồm các nồng độ nitơ khác nhau dưới các thông số chu kỳ ánh sáng khác nhau. Trong nghiên cứu này, vi tảo Nam Cực Chlorella variabilis YTU.ANTARCTIC.001, được nuôi cấy ở các nhiệt độ khác nhau là 4, 13, 20 và 27 °C trong môi trường BG-11 đã được điều chỉnh với các nồng độ NaNO3 khác nhau (0, 0.75, 1.5, 2.5 và 3 g L−1) dưới ba chu kỳ ánh sáng (8:16, 16:8 và 24:0) để điều tra sự tăng trưởng và thành phần hóa sinh. Tốc độ tăng trưởng đặc trưng thay đổi từ 0.012 đến 0.23 ngày−1 với sự gia tăng nồng độ nitrat, nhiệt độ và chu kỳ ánh sáng. Tốc độ tăng trưởng đặc trưng cao nhất là 0.23 ngày−1 khi sử dụng môi trường nuôi cấy gồm 3 g L−1 nitrat ở 27 °C dưới chu kỳ ánh sáng–tối là 16:8 h, trong khi không có sự tăng trưởng tảo ở 4 °C. Hàm lượng carbohydrate, protein, chlorophyll-a và β-carotene của vi tảo tăng lên với nồng độ nitơ tăng ở 20 °C và 27 °C. Hàm lượng lipid cao nhất đạt được là 66% trọng lượng khô (DW), sử dụng môi trường nuôi cấy gồm 0.75 g L−1 nitrat ở 13 °C. Nghiên cứu này nhấn mạnh rằng việc sản xuất vi tảo Nam Cực C. variabilis có thể được thực hiện hiệu quả trong điều kiện ôn đới bằng cách điều chỉnh các thông số tăng trưởng.
Từ khóa
#vi tảo #Nam Cực #tăng trưởng #thành phần hóa sinh #Chlorella variabilis #điều kiện ôn đới #nitratTài liệu tham khảo
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