TY - JOUR
T1 - Epidemic progress of beet necrotic yellow vein virus
T2 - Evidence from an investigation in Japan spanning half a century
AU - Nakagami, Ryo
AU - Chiba, Sotaro
AU - Yoshida, Naoto
AU - Senoo, Yoshiteru
AU - Iketani-Saito, Minako
AU - Iketani, Satoru
AU - Kondo, Hideki
AU - Tamada, Tetsuo
N1 - Funding Information:
The authors thank Toshimi Kusume, Masaki Miyanishi and the late Tadahiko Kiguchi for assisting with soil sampling and BNYVV analysis in the 1990s. They also thank Olga E. Scholten for kindly providing seeds of WB42 and Kazunori Taguchi for seeds of Schwert. This work was supported in part by the Hokkaido Sugar Beet Association and by Yomogi Inc.
Publisher Copyright:
© 2021 British Society for Plant Pathology.
PY - 2021
Y1 - 2021
N2 - Beet necrotic yellow vein virus (BNYVV) is the causal agent of rhizomania, the most serious sugar beet disease worldwide. Since the first finding in Japan in 1969, BNYVV became widespread throughout Hokkaido in a few decades and led to the introduction of Rz1-resistant sugar beet cultivars in the 1990s. Here, we report the historical progress of the BNYVV epidemic in Hokkaido from 1969 to 2019. Previous analysis on samples from 1991 showed that BNYVV isolates were classified into three strains (named O, D, and T) based on the RNA3-encoded p25 gene. The O-type viruses were widely detected in Hokkaido, while the D- and T-type viruses were detected in limited areas. The RNA5, encoding the p26 gene, was initially contained in some D- and O-type isolates but not in any T-type isolates. Interestingly, recent sample analysis revealed that RNA5-containing T-type viruses, seemingly more virulent than the other two strains, were widely detected in Hokkaido. Additionally, a small group of virus isolates harbouring a new p25 gene (named C) was found in limited areas. These results suggest that the T-type viruses, which accompanied RNA5, have been preferentially spread from a limited area to other districts over the last few decades and that this spread might be strongly associated with the recent introduction of Rz1-resistant sugar beet cultivars. BNYVV-positive samples also contained mainly beet soil-borne virus and traces of beet virus Q, both of which are the first to be recorded in Japan.
AB - Beet necrotic yellow vein virus (BNYVV) is the causal agent of rhizomania, the most serious sugar beet disease worldwide. Since the first finding in Japan in 1969, BNYVV became widespread throughout Hokkaido in a few decades and led to the introduction of Rz1-resistant sugar beet cultivars in the 1990s. Here, we report the historical progress of the BNYVV epidemic in Hokkaido from 1969 to 2019. Previous analysis on samples from 1991 showed that BNYVV isolates were classified into three strains (named O, D, and T) based on the RNA3-encoded p25 gene. The O-type viruses were widely detected in Hokkaido, while the D- and T-type viruses were detected in limited areas. The RNA5, encoding the p26 gene, was initially contained in some D- and O-type isolates but not in any T-type isolates. Interestingly, recent sample analysis revealed that RNA5-containing T-type viruses, seemingly more virulent than the other two strains, were widely detected in Hokkaido. Additionally, a small group of virus isolates harbouring a new p25 gene (named C) was found in limited areas. These results suggest that the T-type viruses, which accompanied RNA5, have been preferentially spread from a limited area to other districts over the last few decades and that this spread might be strongly associated with the recent introduction of Rz1-resistant sugar beet cultivars. BNYVV-positive samples also contained mainly beet soil-borne virus and traces of beet virus Q, both of which are the first to be recorded in Japan.
KW - BNYVV
KW - diversity
KW - epidemiology
KW - resistance breaking
KW - rhizomania
KW - sugar beet
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U2 - 10.1111/ppa.13504
DO - 10.1111/ppa.13504
M3 - Article
AN - SCOPUS:85119260530
JO - Plant Pathology
JF - Plant Pathology
SN - 0032-0862
ER -