短期连续剪切对光生物反应器内海带配子体细胞生长及其恢复能力的影响

Effects of Short-term Continuous Shear Stress on Cells Growth and Recovery of Laminaria japonica Gametophytic Cells in Photobioreactor

摘要:

以不同搅拌速率（0～1000r/min）对海带（Laminaria japonica）配子体细胞施加短期（0～60h）连续剪切，卸载剪切力之后细胞静止恢复23.5d，在此期间研究不同搅拌速率分别在连续剪切和恢复期间对细胞生长及其恢复能力的影响。研究结果表明，连续剪切期间，90r/min下细胞叶绿素浓度积累达到最大值2.36mg/L；中高速搅拌速率（270～1000r/min）下叶绿素浓度迅速下降，胞内氮磷池释放，1000r/min下细胞损伤率为静止对照样的18倍。恢复期间，所有组别细胞均呈现较强的恢复能力。此外，在连续剪切实验中，海带配子体细胞内叶绿素浓度比干重更能有效的表达生物量浓度，除细胞损伤率外，磷源释放可以作为判别细胞受损的参考指标之一。

Abstract:

Laminaria japonica gametophytic cells were cultivated in a photobioreactor under continuous shear stress (0～1000r/min) in 60 hours and the following static cultivation within 23.5 days. The content of chlorophyll a reached the maximum value of 2.36mg/L at the end of continuous shear stress when the agitation speed was 90r/min, while the chlorophyll a (chl a) concentration decreased quickly and nitrogen and phosphorus were released under high shear force (270～1000r/min). The cell injury ratio at 1000r/min was as 18 times as that of the control. During the recovery course, gametophytic cells showed themselves distinct recovery capability at all agitation speeds. Furthermore, the content of chl a is a more exact index as biomass than dry cells weight(DCW). Besides cell injury ratio, the liberation of phosphorus demonstrates the cells injury.