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First report of maize yellow mosaic virus on Zea mays in South Korea.

Lim, S. ; Yoon, Y. ; Jang, Y. W. ; Bae, S. ; Lee, Y. H. ; Lee, B. C.

Plant Disease 2018 Vol 102 No. 9 pp. 1864;

Abstract

To confirm whether Maize yellow mosaic virus (MaYMV) exists in maize in South Korea, a total of 26 maize samples with yellowing, yellow stripe, and chlorosis symptoms were collected from three provinces (Chungcheongbuk-do, Gangwon-do, and Gyeongsangnam-do) in August and September 2017. Reverse transcription polymerase chain reaction revealed that 5 out of 6 samples collected from Chungcheongbuk-do, 5 out of 10 samples collected from Gangwon-do, and one out of 10 samples collected from Gyeongsangnam-do were confirmed to be infected with MaYMV. One RT-PCR fragment of MaYMV from each region (Gangwon-do, Chungcheongbuk-do, and Gyeongsangnam-do) was directly sequenced, and the sequences were deposited in GenBank under accession numbers MG020517, MG020518, and MG020519, respectively. The partial nucleotide sequences of MaYMV determined in each sample collected from Chungcheongbuk-do and Gyeongsangnam-do were identical, and these nucleotide sequences differed by one nucleotide from that identified in the sample collected from Gangwon-do. The NCBI BLAST search showed that the three MaYMV isolates shared high nucleotide sequence homology (99 to 100%) with isolates Yunnan3 (KU291099) and Yunnan4 (KU291100) from maize in China. The MaYMV-infected samples showed yellow stripe and chlorosis symptoms, which tend to first appear on the tip and edge of the leaves and become worse. This is thought to be the first report of MaYMV on maize in South Korea.