非生物因素对藻类胞外多聚糖含量影响  

Effects of abiotic factors on algal extracellular polysaccharides content

作　　者：杨州[1] 李佳佳[1] 

机构地区：[1]南京师范大学生命科学学院江苏省生物多样性与生物技术重点实验室,南京210046

出　　处：《应用生态学报》2008年第1期198-202,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30670404);江苏省自然科学基金资助项目(BK2007743).

摘　　要：本文从研究铜绿微囊藻表型转换机制的需要出发,综述了非生物因素对藻类胞外多聚糖含量的影响.很多藻类的胞外多聚糖分泌量与环境中主要营养盐比例之间存在着一定的响应关系,在高碳氮比或高碳磷比条件下,即在氮不足或磷不足时,藻类光合作用固定的有机物质主要以不含氮磷的碳水化合物形式存在,胞内碳水化合物的过量累积导致其逐步向胞外转移释放,使得胞外多聚糖含量显著升高.在碳氮代谢不平衡的情况下,胞外多聚糖充当了接收过剩固定碳的汇.对于一些藻类,不同光谱、光强和光周期均可影响其胞外多聚糖的合成与分泌.温度对藻类胞外多聚糖的产生也有一定影响.由于胞外多聚糖在藻细胞相互粘结形成群体上发挥着重要作用,通过调控相关非生物因素使得铜绿微囊藻胞外多聚糖产量增加可能有助于在室内模拟铜绿微囊藻的群体形成.To get insight of the phenotypic variation mechanisms of Microcystis aeruginosa, this paper reviewed the research results on the effects of various abiotic factors on the content of algal extracellular polysaccharides. Many published papers demonstrated that there exists a definite responsive relationship between the content of algal extracellular polysaccharides and the ratios of main nutritive elements in the environment. Under the condition of high C： N or C： P ratio, i. e. , under nitrogen or phosphorus deficiency, the organic substances fixed by the photosynthesis of algae are mainly existed in the forms of carbohydrates that do not contain nitrogen and phosphorus. The excessive accumulation of polysaccharides in algal cell induces their gradual release to the outside, resuiting in a significant increase＂ in the content of extracellular polysaccharides. Under the unbalanced condition of C or N metabolism, the extracellular polysaccharides can serve as a sink of excessively fixed carbon. For several kinds of algae, different light quality, light intensity and photoperiod can affect their synthesis and secretion of extracellular polysaccharides, and temperature can also affect the production of their extracellular polysaccharides to a certain extent. As the extracellular polysaccharides play a very important role in cementing cells together to form colonies, it＇ s speculated that the increase of extracellular polysaccharides production by M. aeruginosa via the regulation of relevant abotic factors could be helpful to simulate the colony formation of M. aeruginosa in laboratory.

关 键 词：藻类 胞外多聚糖 非生物因素 铜绿微囊藻 表型可塑性 

分 类 号：Q948[生物学—植物学]