Citation: ZHENG Xuefang, CHEN Deju, CHEN Xiaoqiang, LIU Bo, ZHU Yujing. Analysis of the heterogeneity of Ralstonia solanacearum avirulent espD-mutant by high performance ion-exchange chromatography[J]. Chinese Journal of Chromatography, ;2018, 36(1): 23-29. doi: 10.3724/SP.J.1123.2017.09024 shu

Analysis of the heterogeneity of Ralstonia solanacearum avirulent espD-mutant by high performance ion-exchange chromatography

Agricultural Bio-Resources Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China

Received Date: 13 September 2017

Fund Project: National Natural Science Foundation of China (No. 31701835)

The heterogeneity of Ralstonia solanacearum avirulent espD-mutant, virulent wildtype strain FJAT-91 and spontaneous avirulent strain FJAT-1458 were compared and analyzed by using high performance ion-exchange chromatography (HPIEC). Their colony and cell morphologies were observed, and the contents of their extracellular polysaccharides (EPS) were determined. The results showed that the colony and cell morphologies of FJAT-91 ⊿epsD were different from the original strain FJAT-91, but were similar to the spontaneous avirulent strain FJAT-1458. The EPS content of FJAT-91 ⊿epsD was (12.64±1.46) μg/mL, which was much lower than FJAT-91 with (30.49±2.97) μg/mL. The strain FJAT-91 were separated into single peak of P₃ at the retention time of 6.04 min, and FJAT-91 ⊿epsD had two peaks (P₁ and P₂) at the retention times of 0.59 min and 4.62 min, respectively. FJAT-1458 formed single peak of P₁ at the retention time of 0.59 min. Then, the bacteria eluents from different chromatographic peaks were collected and their pathogenicities were detected with bioassay test using potted tomatoes in the greenhouse. The results showed that the tomato plants began to wilt 4 d after inoculation of strain FJAT-91-P₃ eluted from P₃, and the disease incidence reached 100% at 10 d post inoculation. The strain FJAT-91 ⊿epsD-P₂ eluted from P₂ caused tomato plants wilting 9 d after inoculation, and the disease incidence reached 100% at 20 d. During 20 d of observation, none of tomato plants caused wilting while inoculation with FJAT-1458-P₁ and FJAT-91 ⊿epsD-P₁ eluted from P₁ of FJAT-1458 and FJAT-91 ⊿epsD, respectively. In this paper, the morphologies, EPS contents and chromatographic behaviors of FJAT-91, FJAT-91 ⊿epsD and FJAT-1458 were compared, which would provide theoretical basis for using FJAT-91 ⊿epsD to control bacterial wilt disease.
- high performance ion-exchange chromatography (HPIEC),
- exopolysaccharide (EPS),
- Ralstonia solanacearum,
- avirulent strain,
- epsD gene
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