Abstract
Lettuce necrotic yellows virus (LNYV) is the type member of the genus Cytorhabdovirus, family Rhabdoviridae, and causes a severe disease of lettuce (Lactuca sativa L.). This virus has been described as endemic to Australia and New Zealand, with sporadic reports of a similar virus in Europe. Genetic variability studies of plant-infecting rhabdoviruses are scarce. We have extended a previous study on the variability of the LNYV nucleocapsid gene, comparing sequences from isolates sampled from both Australia and New Zealand, as well as analysing symptom expression on Nicotiana glutinosa. Phylogenetic and BEAST analyses confirm separation of LNYV isolates into two subgroups (I and II) and suggest that subgroup I is slightly older than subgroup II. No correlation was observed between isolate subgroup and disease symptoms on N. glutinosa. The origin of LNYV remains unclear; LNYV may have moved between native and weed hosts within Australia or New Zealand before infecting lettuce or may have appeared as a result of at least two incursions, with the first coinciding with the beginning of European agriculture in the region. The apparent extinction of subgroup I in Australia may have been due to less-efficient dispersal than that which has occurred for subgroup II – possibly a consequence of suboptimal interactions with plant and/or insect hosts. Introduction of subgroup II to New Zealand appears to be more recent. More-detailed epidemiological studies using molecular tools are needed to fully understand how LNYV interacts with its hosts and to determine where the virus originated.
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Acknowledgments
The authors would like to thank the following people for assistance in the collection of samples: Prof. John W. Randles (AU18), Ms. Smriti Nair and Ms. Gardette Valmonte (NZ1-6). Isolates AU13, 14 and 17 were kindly provided by Dr. John Thomas. Technical assistance by Mr. Roger Mitchell in the early stages of this work is gratefully acknowledged. The authors would like to thank Jade Hsu, Amy Chang and Ee Ren Tan for their assistance in sequencing isolates AU13-14, AU15-6 and AU17, respectively. CH would also like to thank Dr. Shane Lavery for useful discussions. CH received funding support from the Faculty of Health and Environmental Sciences, Auckland University of Technology. This research was supported by Australian Research Council grant LP110100047.
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Higgins, C.M., Chang, WL., Khan, S. et al. Diversity and evolutionary history of lettuce necrotic yellows virus in Australia and New Zealand. Arch Virol 161, 269–277 (2016). https://doi.org/10.1007/s00705-015-2626-5
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DOI: https://doi.org/10.1007/s00705-015-2626-5