Effects of circadian rhythms of fluctuating temperature on growth and biochemical composition of <Emphasis Type="Italic">Ulva pertusa</Emphasis> |
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Authors: | Qiaohan Wang Shuanglin Dong Xiangli Tian Fang Wang |
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Institution: | (1) The Key Mariculture Laboratory, Ministry of Education, College of Fisheries, Ocean University of China, Qingdao, 266003, China |
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Abstract: | The marcoalga Ulva pertusa was cultured under (20 ± 2)°C, (20 ± 4)°C, (20 ± 6)°C, (20 ± 8)°C and (20 ± 10)°C circadian rhythms of fluctuating temperature
conditions, and constant temperature of 20°C was used as the control. The growth rate of macroalga at (20 ± 2)°C, (20 ± 4)°C
and (20 ± 6)°C were significantly higher than that at constant temperature of 20°C, while growth rate at (20 ± 8)°C and (20
± 10)°C were significantly lower than that at constant temperature of 20°C. The growth rate of macroalga was a quadratic function
of the thermal amplitude. Such a growth model can be described by G = β
0 + β
1(TA) + β
2(TA)2, where G represents the relative growth rate, TA is thermal amplitude in degree Celsius, β
0 is the intercept on the G axis, and β
1 and β
2 are the regression coefficients. The optimal thermal amplitude for the growth of thallus at mean temperature of 20°C was
estimated to be ± 3.69°C. Analysis of biochemical composition at the final stages of thaulls growth revealed that diel fluctuating
temperature caused various influences (P < 0.05). The content of chlorophyll, protein and total solute carbohydrate at (20 ± 2)°C and (20 ± 4)°C were slightly higher
than those at constant temperature of 20°C, however no statistically significant differences were found among them (P > 0.05). While osmolytes (total solute carbohydrate and free proline) at (20 ± 10)°C were significantly higher than that at
20°C (P < 0.05). Therefore, more chlorophyll and carbohydrate production might account for the enhancement in the growth of macroalga
at the diel fluctuating temperatures in the present study.
Handling editor: S. M. Thomaz |
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Keywords: | Macroalga Ulva pertusa Fluctuating temperature Growth Biochemical composition |
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