众所周知，“水华”是由于水体中氮磷含量过高引起富营养化后，导致湖水中蓝藻过度生长而引起的现象[1]。水华蓝藻在富营养化的水体中迅速的占据光照、温度、含氧量等最适合生长繁殖的生态表层，而后大量繁殖。这就使得研究蓝藻在水体中的“垂直移动”进而了解水华爆发的机理有重要作用。本论文的研究对象铜绿微囊藻（Microcystisaeruginosa）PCC7806，它是富营养化湖泊和水库中形成“水华”的典型蓝藻，本实验室前期研究发现铜绿微囊藻（Microcystisaeruginosa）PCC7806分泌表达产物MrpC蛋白形成长纤丝，在水体中形成网络状结构，从而对其在水体中的悬浮产生重要的作用。因而从分...As we know, "bloom" is due to the high level content of nitrogen and phosphorus caused eutrophication, resulting in excessive growth of algae in the lake [1] . Cyanobacteria blooms in eutrophic water quickly growth by occupying light, temperature, oxygen content and the most suitable surface. Thus the study of the mechanism of cyanobacteria in water "vertical movement" will give us further underst...学位：理学硕士院系专业：生命科学学院_微生物学学号：2162012115238
