Interactive effects of Potato virus Y and Potato leafroll virus infection on potato yields in Uganda
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Open Agriculture
Abstract
Potatoes are prone to attack by multiple viruses,
which contribute greatly to yield and quality decline
depending on the cultivar and the virus involved. This study
investigated the effect of co-infection involving Potato virus
Y (potyvirus) and Potato leafroll Virus (pelero virus) on productivity
of five potato cultivars in Uganda and the nature of
virus interaction during co-infection process. Variety response
to virus infection by PVY, PLRV and co-infection
(PVY + PLRV) varied across different varieties. The plants
that were infected with PLRV had leaf rolling, stuntedness,
leaf distortion, reduction in leaf size and mottling and light
yellow mosaics, and in some cases, purple or red margins
were observed, while single infection of PVY induced necrosis,
leaf rugosity, crinkling, stunting, interveinal necrosis,
blotching of the margins, leaf distortion andmottling. When
the two viruses were combined during co-infection with
PVY + PLRV, the symptoms were characterized by bright
blotching and necrotic leaf margins with purpling of the
leaf tips and leaf margins, stuntedness and leaf distortions.
The virus disease severity was higher under mixed infected
plants than single infected plants. The high disease severity
culminated in a significant effect on yield, marketable tuber
number per plant, plant growth height and plant vigor,
which were different across the varieties. Co-infection involving
PVY and PLRV caused a reduction in the marketable
yield of 95.2% (Kinigi), 94% (Victoria), 89.5 (Rwagume),
45.3% (Royal) and 23.7% (Sifra). Single infection by PLRV
caused a reduction in amarketable yield in Victoria (91.8%), Kinigi (84.8%), Rwagume (73.3%), Royal (47.2%) and Sifra
22.1%, while PVY caused a marketable yield reduction in
Victoria (87.2%), Rwagume (85.9.7%), Kinigi (85.1%), Royal
(37.4%) and Sifra (14.1%). The effects associated with the coinfection
of PVY and PLRV were lower than the combined
value of the single infections, suggesting that the two viruses
were interacting to affect the potato productivity. The high
yield loss suggested that effective resistance strategy targeting
PVY, PLRV and their combination was required to
save the potato industry in Uganda.
Description
Keywords
Potato virus interaction effects, Single virus infection, Co-infection
Citation
Byarugaba, AA, Mukasa, SB, Barekye, A., & Rubaihayo, PR (2020). Interactive effects of Potato virus Y and Potato leafroll virus infection on potato yields in Uganda. Open Agriculture , 5 (1), 726-739. https://doi.org/10.1515/opag-2020-0073