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Application of Multiplex RT-PCR for Simultaneous Identification of Tomato Spotted Wilt Virus and Thrips Species in an Individual Thrips on Chrysanthemum
Res. Plant Dis. 2020;26:264-271
Published online December 31, 2020
© 2020 The Korean Society of Plant Pathology.

Ju-Yeon Yoon1* , Jung-Beom Yoon1, Mi-Hye Seo1, Seung-Kook Choi2, In-Sook Cho1, Bong-Nam Chung1, Chang Yeol Yang1, and Venkata Subba Reddy Gangireddygari1

1Department of Horticultural and Herbal Crop Environment, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju 55365, Korea
2Department of Research Planning and Coordination, Rural Development Administration, Jeonju 54875, Korea
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Received November 13, 2020; Revised December 10, 2020; Accepted December 11, 2020.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We have developed a simultaneous diagnostic method that can identify both the species of thrips and tomato spotted wilt virus (TSWV) that are problematic in chrysanthemum plants. This is a method of amplifying DNA by performing reverse transcription-polymerase chain reaction by simultaneously adding primers specific to TSWV coat protein (N) gene and primers specific to the internal transcribed spacer 2 region of Frankliniella occidentalis and F. intonsa using total nucleic acid extracted from one thrips. The sizes of DNA fragments for TSWV, F. occidentalis, and F. intonsa were 777, 287, and 367 bp, respectively. These results showed species identification of thrips and whether thrips carrying TSWV can be simultaneously confirmed. Further usefulness of the simultaneous diagnostic method was made from greenhouse survey at chrysanthemum greenhouses in Taean (Chungcheongnam-do) and Changwon (Gyeongsangnam-do) to investigate the identification of thrips species and the rate of thrips carrying TSWV. Of thrips collected from the greenhouses, 83.7% thrips was F. occidentalis and 72.9% F. occidentalis carried TSWV in Taean. Similarly, the diagnostic method showed that 92.2% thrips was F. occidentalis and 84.0% F. occidentalis carried TSWV in Changwon. These results confirm that F. occidentalis is a dominant thrips species and the thrips species plays a crucial role in the transmission of TSWV in chrysanthemum plants in the greenhouses. Taken together, this study showed a simple diagnostic method for thrips identification and epidemiological studies of the timing and spread of TSWV through thrips in chrysanthemum greenhouses in South Korea.
Keywords : Acquisition, Chrysanthemum, Polymerase chain reaction, Thrips, TSWV

December 2020, 26 (4)