November/December 2020 - 44
like potatoes, which apparently either
do not recognize the invader or lack a
means of responding to it.
There are many reasons why a plant
gene would change expression during
nematode infection. While some might
be part of the plant's defense, others
might become activated as the parasite
tries (unsuccessfully) to reshape litchi
tomato root cells into structures
that would provide nutrients for the
nematode. Other genes may be turned
on or off as the plant attempts to
preserve the structure of its root cells,
but these are not the kind of genes
likely to be directly responsible for
killing the pathogen.
To be clear, just looking at DNA
sequences cannot tell us which of
these genes is changing its operation
for the benefit of the cyst nematode,
and which is changing for the benefit
of the plant. To make those kinds
of distinctions so that the defensive
genes could be used to engineer truly
resistant potatoes, researchers will
have to study each candidate gene in
isolation from the rest.
This will require putting each gene
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into potatoes, testing whether the
resulting transgenic plants are more
resistant to Globodera, and finally
combining multiple genes in a single
cultivar to re-create the litchi tomato
defense system. This kind of analysis
is already underway in laboratories
in Idaho, New York and elsewhere, to
generate crops that are as resistant to
PCN as LT.
Work will also continue in order
to identify potato cultivars with
effective nematode resistance that
could be bred into premier genetic
backgrounds like Russet Burbank.
But if these donors are not found, or
if Globodera acquires mutations that
break that resistance, growers need a
" Plan C, " like genetic engineering to
fall back on.
Traditional breeding, the development
of new nematicides, and genetic
engineering each have their own
limitations. Just as health care services
need to anticipate and prepare
flu
2021 BUYERS' GUIDE
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42
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vaccines before epidemics begin,
nematode resistant potatoes need to
be developed either through classical
breeding or genetic engineering before
crop failure.
http://www.albertapotatoes.ca
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November/December 2020
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