16S rRNA amplicon from the bacterium, which associated with  Prorocentrum minimum and collected by filtration
total environment DNA was extracted from 30mL of microalage culture using MagicPure Stool and Soil Genomic DNA Kit (TransGEN Biotech Cat. No. EC801). The 16S rRNA gene were paired-end sequenced through Illumina HiSeq 2500 platform to investigate the composition of the microbial community by BGI (Beijing Genomics Institute, Shenzhen, China).