The Effects of Circadian Rhythms of Fluctuating Salinity on the Growth and Biochemical Composition of Ulva pertusa
The Effects of Circadian Rhythms of Fluctuating Salinity on the Growth and Biochemical Composition of Ulva pertusa
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发表时间：
2007
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通讯作者：
Wang Qiao
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作者：
Wang Qiao
在30± 3、30 ± 6、30 ± 9、30 ±12和30±15昼夜节律的盐度波动条件下培养孔石莼（Ulva pertusa），并以恒定盐度30作为对照，结果表明，在盐度波动条件下，孔石莼的生长速率显著低于恒定盐度30，不同盐度波动条件下孔石螺的相对生长率均保持在12%以上盐度波动条件下叶绿素a和叶绿素B含量略低于盐度30时的含量，但差异不显著（P0.05盐度波动条件下蛋白质和总可溶性碳水化合物含量显著高于盐度30时脯氨酸含量随盐度波动幅度的增大而增加，但在轻度盐度变化（30±3）时脯氨酸含量显著低于恒定盐度时（P0. 05）。因此，在本研究中，更多的蛋白质和碳水化合物的生产可能是在昼夜波动的盐度下提高大黄鱼质量的原因。
The marcoalga Ulva pertusa was cultured under 30±3,30±6,30±9,30±12 and 30±15 circadian rhythms of fluctuating salinity conditions,and a constant salinity of 30 was used as the control.The growth rates of macroalga under fluctuating salinity conditions were significantly lower than that at the constant salinity of 30,while the RGR of U.pertusa under different fluctuating salinity conditions were all kept at least 12%.Analysis of biochemical composition at the final stages of thaulls growth revealed that diel fluctuating salinity caused various influences(P0.05).The contents of chlorophyll a and chlorophyll b under fluctuating salinity conditions were slightly lower than those at constant salinity of 30,however no statistically significant differences were found among them(P0.05).The contents of protein and total solute carbohydrate under fluctuating salinity conditions were significantly higher than those at constant salinity of 30(P0.05),and there was a trend that the content of proline increased with the increase of amplitude of fluctuating salinity,while the content of proline during mild salinity of changes(30±3) was significantly lower than that at constant salinity(P0.05). Therefore,more protein and carbohydrate production might account for the enhancement in the quality of macroalga at the diel flunctuating salinity in the present study.