Apple necrotic mosaic virus: a new ilarvirus of apple trees in Asia
So far, apple mosaic disease was considered to be caused solely by apple mosaic virus (Ilarvirus, ApMV). During studies conducted in 2017 in Japan, HTS analysis of samples collected from a symptomatic apple (Malus domestica) tree revealed the presence of a new ilarvirus tentatively called apple necrotic mosaic virus (ApNMV), as well as of three other viruses (apple stem pitting virus, apple stem grooving virus, and apple chlorotic leaf spot virus). Further studies conducted in China in the major apple-producing provinces showed that the majority of apple trees showing mosaic symptoms were infected with ApNMV but not by ApMV. It is speculated that many past Chinese records of ApMV should be re-attributed to ApNMV. In China, ApNMV was also detected on crab apple (Malus spp.) and hawthorn (Crataegus spp) associated with mosaic symptoms. In addition to China and Japan, ApNMV has been detected in India (Jammu & Kashmir) and the Republic of Korea.
Sources
Cho IS, Kwon SJ, Yoon JY, Chung BN, Hammond J, Lim HS (2017) First report of apple necrotic mosaic virus infecting apple trees in Korea. Journal of Plant Pathology 99, p 815.
Hu GJ, Dong YF, Zhang ZP, Fan XD, Ren F (2019) Molecular characterization of Apple necrotic mosaic virus identified in crabapple (Malus spp.) tree of China. Journal of Integrative Agriculture 18(3), 698-701.
Nabi SU, Baranwal VK, Yadav MK, Rao GP (2020) Association of Apple necrotic mosaic virus (ApNMV) with mosaic disease in commercially grown cultivars of apple (Malus domestica Borkh) in India. 3 Biotech 10, p 122.
Noda H, Yamagishi N, Yaegashi H, Xing F, Xie JP, Li SF, Zhou T, Ito T, Yoshikawa N (2017) Apple necrotic mosaic virus, a novel ilarvirus from mosaic-diseased apple trees in Japan and China. Journal of General Plant Pathology 83, 83–90.
Shi W, Yao R, Sunwu R, Huang K, Liu Z, Li X, Yang Y, Wang J (2020) Incidence and molecular identification of apple necrotic mosaic virus (ApNMV) in Southwest China. Plants 9(4), 415. https://doi.org/10.3390/plants9040415
Xing F, Hou W, Massart S, Gao D, Li W, Cao M, Zhang Z, Wang H, Li S (2020) RNA-Seq reveals hawthorn tree as a new natural host for apple necrotic mosaic virus, possibly associated with hawthorn mosaic disease. Plant Disease 104(10), 2713-2719. https://doi.org/10.1094/PDIS-11-19-2455-RE
Xing F, Robe BL, Zhang ZX, Wang HQ, Li SF (2018) Genomic analysis, sequence diversity, and occurrence of apple necrotic mosaic virus, a novel ilarvirus associated with mosaic disease of apple trees in China. Plant Disease 102(9), 1841–1847. https://doi.org/10.1094/PDIS-10-17-1580-RE