Plant Disease (2019) 103, 2221-2230

Tyler D.B. MacKenzie, Xianzhou Nie, Vikram Bisht and Mathuresh Singh (2019)
Proliferation of recombinant PVY strains in two potato-producing regions of Canada, and symptom expression in 30 important potato varieties with different PVY strains
Plant Disease 103 (9), 2221-2230
Abstract: Potato virus Y (PVY) exists as several strains with distinct symptomology and tuber yield effects in different potato varieties. Recently, new recombinant strains have proliferated and dominated local populations around the world. In this study, PVY^O, PVY^N:O, PVY^N-Wi, and PVY^NTN strains were tracked across Canada from 2014 to 2017, showing rapid evolution of populations away from the traditionally dominant PVY^O to recombinants PVY^N-Wi (western Canada) and PVY^NTN (eastern Canada). Simultaneously, 30 potato varieties were inoculated with PVY^O, PVY^N:O, and PVY^NTN in controlled greenhouse experiments. Foliar symptoms of primary (mechanical inoculation mimicking aphid infection) and secondary (tuber seedborne) infection were cataloged, and tuber yield measured. On average, and generally similar in primary and secondary infection, symptom expression and yield reduction were most severe with PVY^O, followed by PVY^N:O and PVY^NTN. Strong mosaic symptoms were most commonly expressed with PVY^O infection, and only seen with PVY^N:O or PVY^NTN in 15 and 3 varieties, respectively. Across variety–strain combinations, yield reduction was correlated with symptom severity, most strongly in PVY^O-infected plants (e.g., AC Chaleur, Beljade, Envol, Norland, and Pacific Russet), and four varieties exhibited tuber necrotic ringspot disease with PVY^NTN (AC Chaleur, Envol, Pacific Russet, and Yukon Gold).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Xianzhou Nie

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Potato virus Y	Potato (Solanum tuberosum)	Canada (east)