November/December 2021 - 14

The 58th annual Washington
State University seed lot
trials took place this summer
in Othello, Washington.
Photos: Bill Schaefer
PVY Update:
The good and the bad
Othello trials show decreased levels of O strain,
but researchers fear other emergents
By Bill Schaefer
CONTRIBUTING WRITER
W
hen it comes to reporting
about potato virus Y (PVY),
it's a good news, bad news
kind of story.
The good news is that researchers
are seeing less PVY-O, especially in
potato fields throughout the Pacific
Northwest (PNW). The bad news is
that, just like COVID-19 or any virus,
PVY continues to mutate creating
recombinant strains.
In
June,
at Washington
State
University's 58th annual commercial
seed lot trial in Othello, Alex Karasev
was emphatically positive about the
lack of PVY-O at the trial.
" What we see, as the good news, we
see degrees in genetic diversity so we see
certain strains of the virus disappearing, "
said Karsev, a professor of plant virology
12
Spudman.com
at the University of Idaho. " So, the latest
victim of this disappearance is PVY-O,
it's the first year I do not see a single
sample of it in the field. "
Karasev said that PVYN-Wilga
and PVY-NTN currently are the two
prevalent
strains dominating potato
fields in the PNW. He said that Wilga
comprised an estimated 76%, NTN
comprised an estimated 21% and about
2% of an additional recombinant strain
called PVY-NO were the PVY strains
found in the PNW. He said that the
recombinant strain NO is the toughest
one to develop resistance to.
Karasev hypothesizes that recently
released new potato varieties are part of
the explanation for the lack of PVY-O.
" Why you see such low diversity of
this PVY-O, it's probably because these
cultivars that are released recently, they
have certain level of resistance, especially
to PVY-O, " Karasev said. " That may be
why it is gone because it just cannot
penetrate these new cultivars. "
Karasev said that a lot of varieties have
strain specific resistance against PVY-O.
" Actually
the
majority
of modern
cultivars they have good resistance
against this specific strain, " he said, " so
breeders certainly did a very good job
selecting resistant cultivars, they just
didn't know that it was a single strain that
was circulating in the fields they actually
selected strain-specific resistance. "
Karasev said that he is participating
develop
in
a
research
grant
to
management tools to reduce PVY and
another emerging virus - potato moptop.
Both diseases induce necrotic tuber
symptoms.
" We have multiple research
projections, " he said. " So, trying to create
management tools, a better certification
system and to go after resistance, broadtype
resistance to this virus. Also, we

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November/December 2021

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