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A Duplex PCR Assay for Rapid Detection of Phytophthora nicotianae and Thielaviopsis basicola
Plant Pathol. J. 2019;35:172-177
Published online April 1, 2019
© 2019 The Korean Society of Plant Pathology.

Na Liu1, Shijun Jiang2, Songli Feng1, Wenyan Shang1, Guozhen Xing1, Rui Qiu3, Chengjun Li3, Shujun Li3,*, and Wenming Zheng1,*

1College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China, 2College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, China, 3Key Laboratory for green preservation & control of tobacco diseases and pests in Huanghuai Area, Tobacco Research Institute of Henan Academy of Agricultural Science, Xuchang 461000, China
Correspondence to: *W. Zheng, Phone) +86-371-63555963, FAX) +86-371-63555790
S. Li, Phone) +86-374-4511016, FAX) +86-374-4519229
Received September 4, 2018; Revised December 11, 2018; Accepted December 28, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

A duplex PCR method was developed for simultaneous detection and identification of tobacco root rot pathogens Phytophthora nicotianae and Thielaviopsis basicola. The specific primers for P. nicotianae were developed based on its internal transcribed spacer (ITS) regions of ribosomal gene, ras gene and hgd gene, while the specific primers for T. basicola were designed based on its ITS regions and β-tubulin gene. The specificity of the primers was determined using isolates of P. nicotianae, T. basicola and control samples. The results showed that the target pathogens could be detected from diseased tobacco plants by a combination of the specific primers. The sensitivity limitation was 100 fg/μl of pure genomic DNA of the pathogens. This new assay can be applied to screen out target pathogens rapidly and reliably in one PCR and will be an important tool for the identification and precise early prediction of these two destructive diseases of tobacco.

Keywords : duplex PCR, molecular detection, Phytophthora nicotianae, Thielaviopsis basicola, tobacco
Supplementary Information

This work was supported by the Science and Technology Project of Henan Tobacco Company, China (Project No. 201741000027063) and the Self-innovation Project of Henan Academy of Agricultural Science, China (Project No. 2017ZC21). We are grateful to Professor Trevor C. Charles at the University of Waterloo Canada for reading through and editing our manuscript before submission to The Plant Pathology Journal.

Fig. 1. Duplex PCR results for Phytophthora nicotianae and Thielaviopsis basicola. (A, B) Duplex PCR for primer combination TBITS1419-F/TBITS1419-R of T. basicola with YYI-F/YYI-R and YYH-F/YYH-R of P. nicotianae. 1: DNA mixture of T. basicola and P. nicotianae; 2: DNA mixture of P. nicotianae and T. basicola; 3: DNA of T. basicola; 4: DNA of P. nicotianae; M: DM2000 DNA Marker; CK: control (distilled water). (C, D) Duplex PCR for primer TBβ1419-F/TBβ1419-R of T. basicola combined with YYI-F/YYI-R and YYH-F/YYH-R of P. nicotianae. 1: DNA mixture of T. basicola and P. nicotianae; 2: DNA mixture of P. nicotianae and T. basicola; 3: DNA of P. nicotianae; 4: DNA of T. basicola; M: DM2000 DNA Marker; CK: control (distilled water).

Primers for the detection of Phytophthora nicotianae and Thielaviopsis basicola

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