Abstract: A method of using a strain of ciliated protozoan for promoting effect on germination and growth of plant seeds is provided. The ciliated protozoan is a Colpoda species JH2-5-4, with preservation number of China Center for Type Culture Collection (“CCTCC”) NO. C202229. A method of screening and selecting a highly efficient and active strain suitable for use as a microbial fertilizer in plant cultivation is provided. The selected ciliated protozoan strain shortens the germination time of plant seeds, promotes plant growth, and improves seedling survival rate.

Abstract: The present disclosure provides a biological control method for ciliate disease, and belongs to the technical field of biological control. The biological control method includes the following step: adding Chaenea vorax into an aquaculture pond to control the ciliate disease; and the Chaenea vorax includes Chaenea vorax PJ13002. According to the present disclosure, the Chaenea vorax PJ13002, a predatory protozoan, is introduced to recover a microbial food chain existing in nature in an aquaculture system and achieve biological control of the ciliate disease. Meanwhile, the Chaenea vorax PJ13002 can be directly ingested by aquaculture animals without causing diseases, so that a more stable aquaculture system can be formed, losses are avoided, costs are reduced, and economic benefits are increased. The method provides a new thought for controlling the ciliate disease and has an excellent popularization and application prospect.

Abstract: A strain of ciliated protozoan is provided, which has an obvious promoting effect on germination and growth of plant seeds. The ciliated protozoan is Colpoda sp. JH2-5-4, with preservation number of CCTCC NO.C202229. After collecting over 2,000 Colpoda strains from soils across China, the present invention has screened and selected a highly efficient and active strain suitable for use as a microbial fertilizer in plant cultivation. The selected ciliated protozoan can significantly shorten the germination time of plant seeds and improve seedling survival rate.