Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (2): 142-151.doi: 10.11924/j.issn.1000-6850.casb2022-0046

Special Issue: 水产渔业

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The Way of Water Spinach Planting Affecting the Micro-ecological Environment of Pond Water Ecosystem

FAN Limin1,2(), WANG Qing3, CHEN Xi1,2, QIU Liping1, MENG Shunlong1(), SONG Chao1, SU Yongteng4, HU Gengdong1, CHEN Jiazhang1,2()   

  1. 1 Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Key Laboratory of Freshwater Fisheries and Utilization of Germplasm Resources of Ministry of Agriculture and Rural Affairs, Wuxi, Jiangsu 214081
    2 Wuxi Fishery College of Nanjing Agricultural University, Wuxi, Jiangsu 214081
    3 Wuxi COFCO Engineering and Technology Co., Ltd., Wuxi, Jiangsu 214062
    4 Jiangsu Yihui Biotechnology Co., Ltd., Nanjing 211225
  • Received:2022-01-26 Revised:2022-08-31 Online:2023-01-15 Published:2023-01-17

Abstract:

In order to explore the way of water spinach planting in floating bed affecting the water micro-ecological environment of tilapia aquaculture ponds, water spinach floating beds were set up in the ponds under the 10% coverage. These ponds served as the treatment group, while the other ponds without floating beds served as the control group. After the vigorous growth of water spinach, the samples of water from treatment ponds, control ponds, and the samples of water spinach roots were collected respectively. The DNA of the samples was extracted, part of them was used to amplify the 16S rRNA genes and carry out the high-throughput sequencing, to investigate the effect of water spinach planting on the bacterial community structure in water, and analyze the relationship between the root system of water spinach and the bacterial community structure of surrounding water. Another part of DNA was used to conduct the fluorescent quantitative PCR to determine the copy number of nitrogenase gene, and analyze the effect of water spinach planting on the nitrogenase genes in tilapia aquaculture pond ecosystems. The results showed that the direct effect of water spinach planting on the community structure of planktonic bacteria in the water was not significant; however, the root biofilm of water spinach played an important role as a key part of the pond micro-environment. At the same time, water spinach root biofilm also increased the number of nitrogen-fixing microorganisms per unit volume in pond water.

Key words: water spinach, floating bed, tilapia aquaculture pond, bacterial community, affecting way