›› 2018, Vol. 45 ›› Issue (9): 2575-2581.doi: 10.16431/j.cnki.1671-7236.2018.09.030

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Isolation and Biological Properties Analysis of a Salmonella Pullorum Lytic Phage with Wide Host Range

WANG Xiangyan, XIN Guoqin, DONG Peipei, LIU Yuanxiang, XU Haiyan   

  1. Shandong Key Laboratory of Animal Mico-Ecological Agent, Shandong Baolai-LeeLai Bioengineering Co., Ltd., Tai'an 271000, China
  • Received:2018-02-23 Online:2018-09-20 Published:2018-09-26

Abstract:

The study was aimed to separate a Salmonella Pullorum lytic phage with wide host range using the double-layer agar culture method.The feces,sewage and padding were collected from the modern broiler farms.And the biological parameters of the lytic phage were assayed,including the transmission electron microscopy observation,determination of host range,thermal stability,pH stability,optimal multiplicity of infection (MOI) and one-step growth curve drawing.The results showed that a lytic phage against Salmonella Pullorum was successfully isolated and purified which was named as STP98-a.Its plaques were round and transparent and the sizes were about 4 to 5 mm in diameter.It had an elliptical head with approximately 61 nm in diameter,67 nm in transverse diameter and had a long tail with 112 nm in length,10 nm in diameter,indicating it belonged to Siphoviridae.Phage STP98-a could lyse Salmonella Pullorum and Salmonella enterica subsp.enterica with a wide host range.The phage was stable with a wide range of temperature (30 to 60℃) and pH (3.0 to 12.0).The optimal MOI was 0.001.The one-step growth curve showed that the latent time and burst time of STP98-a were 5 and 135 min,respectively,and the burst size was 93.In conclusion,STP98-a was a Salmonella Pullorum lytic phage with wide host range that could serve as a promising phage preparations against Salmonella Pullorum.

Key words: Salmonella Pullorum lytic phage; wide host range; isolation; biological properties

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