10.5061/DRYAD.38J37
Kuester, Adam
University of Michigan-Ann Arbor
Wilson, Ariana
University of Michigan-Ann Arbor
Chang, Shu-mei
University of Georgia
Baucom, Regina S.
University of Michigan-Ann Arbor
Data from: A resurrection experiment finds evidence of both reduced
genetic diversity and potential adaptive evolution in the agricultural
weed Ipomoea purpurea
Dryad
dataset
2016
temporal evolution
allelic diversity
drift
2016-06-28T14:24:41Z
2016-06-28T14:24:41Z
en
https://doi.org/10.1111/mec.13737
275982 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Despite the negative economic and ecological impact of weeds, relatively
little is known about the evolutionary mechanisms that influence their
persistence in agricultural fields. Here, we use a resurrection approach
to examine the potential for genotypic and phenotypic evolution in Ipomoea
purpurea, an agricultural weed that is resistant to glyphosate, the most
widely used herbicide in current-day agriculture. We found striking
reductions in allelic diversity between cohorts sampled nine years apart
(2003 vs. 2012), suggesting that populations of this species sampled from
agricultural fields have experienced genetic bottleneck events that have
led to lower neutral genetic diversity. Heterozygosity excess tests
indicate that these bottlenecks may have occurred prior to 2003. A
greenhouse assay of individuals sampled from the field as seed found that
populations of this species, on average, exhibited modest increases in
herbicide resistance over time. However, populations differed
significantly between sampling years for resistance: some populations
maintained high resistance between the sampling years whereas others
exhibited increased or decreased resistance. Our results show that
populations of this noxious weed, capable of adapting to strong selection
imparted by herbicide application, may lose genetic variation as a result
of this or other environmental factors. We probably uncovered only modest
increases in resistance on average between sampling cohorts due to a
strong and previously identified fitness cost of resistance in this
species, along with the potential that nonresistant migrants germinate
from the seed bank.
SSRResistanceTraits