Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (5): 154-164.doi: 10.11924/j.issn.1000-6850.casb2022-0562

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Characteristics Analysis of Phycosphere Bacteria and Algal Bacterial Communities of Shell Conchocelis of Porphyrahaitanensis with White Spot Disease

MIAO Fan1(), LIU Xin1, LIN Gang1,2(), CHEN Yanting3, LIU Yanfei3, ZHENG Yi1,2   

  1. 1 College of life sciences, Fujian Normal University, Fuzhou 350117
    2 Fujian Key Laboratory of Special Marine Bio-resources Sustainable Utilization, Fuzhou 350117
    3 Fujian Fisheries Technology Extension Center, Fuzhou 350002
  • Received:2022-07-07 Revised:2022-11-01 Online:2023-02-15 Published:2023-02-06

Abstract:

Porphyrahaitanensis is one of the most valuable marine economic crops. The shell conchocelis white spot disease has seriously affected the healthy development of Porphyrahaitanensis seedling industry. The study on the epiphytic bacterial community of shell conchocelis and the bacterial community in the phycosphere of Porphyrahaitanensis white spot disease can provide a basis for elucidating the pathogenic microecological mechanism of white spot disease. Based on high-throughput sequencing technology, this study analyzed the community structure of healthy and diseased shell conchocelis epiphytic bacteria and phycosphere bacteria and their effects on shell conchocelis. The results showed that the abundance and diversity of epiphytic bacteria on the conchocelis of white spot shellfish decreased, and the abundance and diversity of bacteria in the phycosphere increased. There were significant differences in the bacterial community structure between the healthy pool water and the pool water with white spot disease. Proteobacteria and bacteroidota were the dominant bacteria in water samples from healthy pools and pools suffering from white spot disease, Cyanobacteria and Proteobacteria were the dominant bacteria in water source; Nautella and Vibrio were dominant bacteria in the shell conchocelis body water with white spot disease. Among the epiphytic bacteria of white spot shell conchocelis, the abundance of Geobacillus was 18.25%, while that of healthy shell conchocelis was only 0.05%, with a highly significant difference. The high abundance of Vibrio in the water body of the cultivation pond and the high abundance of Geobacillus on the shell conchocelis are both important causes of Porphyrahaitanensis shell conchocelis white spot disease. The stability of the community structure of phycosphere bacteria and shell conchocelis epiphytic bacteria is the key factor in the seedling raising of Porphyrahaitanensis.

Key words: Porphyrahaitanensis, white spot disease, bacterial communities, high-throughput sequencing, shell conchocelis