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Position: Home > Articles > Apple stem grooving virus is associated with leaf yellow mottle mosaic disease on Citrus grandis cv. Huangjinmiyou in China Journal of Integrative Agriculture 2022,21 (7)

Apple stem grooving virus is associated with leaf yellow mottle mosaic disease on Citrus grandis cv. Huangjinmiyou in China

作者：

Xuan Zhi-you;Zhang Song;Li Ping;Yang Fang-yun;Chen Hong-ming;Liu Ke-hong;Zhou Yan;Li Zhong-an;Zhou Chang-yong;Cao Meng-ji

单位：

Southwest Univ, Natl Citrus Engn & Technol Res Ctr, Citrus Res Inst, Chongqing 400712, Peoples R China;Southwest Univ, Acad Agr Sci, State Cultivat Base Crop Stress Biol Southern Mt, Chongqing 400715, Peoples R China

关键词：

citrus;pummelo;apple stem grooving virus;genome sequence;thermotherapy

摘要：

Although it is usually latent on citrus, apple, and pear, apple stem grooving virus ( ASGV) poses a great risk to many sensitive cultivars. Since severe leaf yellow mottle mosaic (LYMM) symptoms have been observed on Huangjinmiyou (HJY) pummelos (Citrus grandis cv. Huangjinmiyou), a commercial variety that is widely cultivated in South China, high throughput sequencing (HTS) was used to find potential pathogens and only three divergent ASGV variants were identified. The three ASGV variants shared 81.03-82.34% genome-wide pairwise identities with each other, and were separately closest to other ASGV variants from different hosts and/or geographical regions, as indicated by viral phylogenies. However, these new variants may have developed from viral interstrain interactions, based on the results of recombination analysis. A large-scale survey using reverse transcription-PCR (RT-PCR) protocols designed for the three ASGV variants revealed a high incidence (92.7-100%) of ASGV in symptomatic HJY trees from 11 major citrus-producing regions in China. None of ASGV were detected in asymptomatic trees. Temperature treatments applied to the symptomatic HJY plants showed that ASGV is sensitive to high temperatures (30-35 degrees C), at which not only the plants recovered, but also the viruses were not detected by RT-PCR, while at low temperatures (20-24 degrees C), both the symptoms and viruses remained detectable. These data show that ASGV is associated with the LYMM disease prevalent on HJY in China, and this is the significant basis especially of taking appropriate measures timely to manage the disease.

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Apple stem grooving virus is associated with leaf yellow mottle mosaic disease on Citrus grandis cv. Huangjinmiyou in China

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