Preliminary study on pathogen of Whitmania pigra disease in high temperature environment

Abstract

In this paper, on the contrast of healthy leech, the bacterial diversities were analyzed by 16S rDNA sequence analysis of the bacteria of muscle and intestinal tract of Whitmania pigra, the environment water and sediment of cultivating the diseased Wh. pigra in high temperature by high-throughput sequencing to determine the possible pathogenic bacteria of bacterial diseases of Leech in high temperature. The results showed that the original sequence reached over 83 000, and the effective sequences accounted for more than 87%. The GC contents ranged from 52% to 54% and the bacterial diversities were abundant. Bacterial relative abundance analysis showed that the bacterial content of Proteobacteria, Bacteroidetes, and Firmicutes was the most abundant in all treatments. Compared with healthy leech muscles and intestines, the muscle and intestinal tract of pathogenic leech relative abundance of Bacteroides, Pseudomonas, and Desulfovibrio was significantly increased, and it was abundant in water and sediment of diseased leeches, Lead to the possibility that the pathogenic bacteria of this bacterial disease may be Bacteroides, Pseudomonas, Desulfovibrio.