Phylogenetic tree was constructed and displayed that a . platensis fachb341 , a . maxima ouqdsm and a . platensis fachb439 formed the monophyletic linage , which was fully supported by bootstrap values ( 1000 ) , while spirulina fachb440 and anabaena pcc7120 clustered in another linage with the bootstrap value of 909 系统发生分析结果显示，三个节旋藻品系形成一个小的分支，其自举值为1000而螺旋藻与鱼腥藻聚合为一个类群，自举值为909 。同时我们以钝顶节旋藻fachb341m platenstsfachb341 ）为材料，克隆了2073hp长的rubisco序列。
