A resurrection experiment finds evidence of both reduced genetic diversity and potential adaptive evolution in the agricultural weed<i>Ipomoea purpurea</i>

Kuester, Adam; Wilson, Annie M.; Chang, Shu‐Mei; Baucom, Regina S.

doi:10.1101/024950

Cited by 13 publications

(30 citation statements)

References 52 publications

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“…These results demonstrate that populations of a native plant with a restricted range are capable of responding to severe drought within a few years. Previous studies have demonstrated rapid evolution in plant populations in response to environmental changes, and many of these studies included weedy or introduced species with broad geographic ranges (e.g., Franks, ; Franks et al, ; Kuester et al, ; Parmesan, ; Sultan et al, ; Thomann et al, ), which can benefit from increased genetic variation from population mixing or hybridization during the invasion process (e.g., Gaskin & Schaal, ; Lavergne & Molofsky, ). In contrast, peripheral populations and species with restricted ranges have been viewed as potentially unable to respond quickly or effectively to a strong selective pressure due to lack of genetic variation (Dawson et al, ; Holt et al, ; Kirkpatrick & Barton, ; Pujol & Pannell, ; but see Sheth & Angert, ).…”

Section: Discussionmentioning

confidence: 99%

“…The “resurrection” approach has recently emerged to document trait shifts (e.g., phenology) due to contemporary evolution (Dijk & Hautekèete, ; Franks et al, , ; Franks, Hamann, & Weis, ; Hairston et al, ; Kuester, Wilson, Chang, & Baucom, ; Sultan et al, ). This approach takes ancestral and descendent seeds collected from a population and raises them in a common environment.…”

Section: Introductionmentioning

confidence: 99%

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Evidence for adaptive responses to historic drought across a native plant species range

Dickman

Pennington

Franks

et al. 2019

Evolutionary Applications

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As climatic conditions change, species will be forced to move or adapt to avoid extinction. Exacerbated by ongoing climate change, California recently experienced a severe and exceptional drought from 2011 to 2017. To investigate whether an adaptive response occurred during this event, we conducted a “resurrection” study of the cutleaf monkeyflower ( Mimulus laciniatus ), an annual plant, by comparing trait means and variances of ancestral seed collections (“pre‐drought”) with contemporary descendant collections (“drought”). Plants were grown under common conditions to test whether this geographically restricted species has the capacity to respond evolutionarily to climate stress across its range. We examined if traits shifted in response to the recent, severe drought and included populations across an elevation gradient, including populations at the low‐ and high‐elevation edges of the species range. We found that time to seedling emergence in the drought generation was significantly earlier than in the pre‐drought generation, a response consistent with drought adaptation. Additionally, trait variation in days to emergence was reduced in the drought generation, which suggests selection or bottleneck events. Days to first flower increased significantly by elevation, consistent with climate adaptation across the species range. Drought generation plants were larger and had greater reproduction, which was likely a carryover effect of earlier germination. These results demonstrate that rapid shifts in trait means and variances consistent with climate adaptation are occurring within populations, including peripheral populations at warm and cold climate limits, of a plant species with a relatively restricted range that has so far not shifted its elevation distribution during contemporary climate change. Thus, rapid evolution may mitigate, at least temporarily, range shifts under global climate change. This study highlights the need for better understanding rapid adaptation as a means for plant communities to cope with extraordinary climate events.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evidence for adaptive responses to historic drought across a native plant species range

Dickman

Pennington

Franks

et al. 2019

Evolutionary Applications

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“…While the majority of the populations sampled in 2003 had experienced glyphosate application (Kuester et al . ), they further experienced consistent glyphosate application between sampling periods, and on average, populations in 2012 exhibit slightly higher levels of resistance compared to the same populations from 2003 (Kuester et al . ).…”

Section: Discussionmentioning

confidence: 97%

“…), they further experienced consistent glyphosate application between sampling periods, and on average, populations in 2012 exhibit slightly higher levels of resistance compared to the same populations from 2003 (Kuester et al . ). Interestingly, we uncovered a significant interaction between sampling year and resistance for pistil height: the relationship between pistil height and resistance was negative in 2012 but positive in 2003.…”

Section: Discussionmentioning

confidence: 97%

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Shifts in outcrossing rates and changes to floral traits are associated with the evolution of herbicide resistance in the common morning glory

et al. 2016

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Human-mediated selection can strongly influence the evolutionary response of natural organisms within ecological timescales. But what traits allow for, or even facilitate, adaptation to the strong selection humans impose on natural systems? Using a combination of laboratory and greenhouse studies of 32 natural populations of the common agricultural weed, Ipomoea purpurea, we show that herbicide-resistant populations self-fertilise more than susceptible populations. We likewise show that anther-stigma distance, a floral trait associated with self-fertilisation in this species, exhibits a nonlinear relationship with resistance such that the most and least resistant populations exhibit lower anther-stigma separation compared to populations with moderate levels of resistance. Overall, our results extend the general finding that plant mating can be impacted by human-mediated agents of selection to that of the extreme selection of the agricultural system. This work highlights the influence of human-mediated selection on rapid responses of natural populations that can lead to unexpected long-term evolutionary consequences.

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Population responses to a historic drought across the range of the common monkeyflower (Mimulus guttatus)

Kooyers

Morioka

Colicchio

et al. 2021

American J of Botany

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PREMISE Due to climate change, more frequent and intense periodic droughts are predicted to increasingly pose major challenges to the persistence of plant populations. When a severe drought occurs over a broad geographical region, independent responses by individual populations provide replicated natural experiments for examining the evolution of drought resistance and the potential for evolutionary rescue. METHODS We used a resurrection approach to examine trait evolution in populations of the common monkeyflower, Mimulus guttatus, exposed to a record drought in California from 2011 to 2017. Specifically, we compared variation in traits related to drought escape and avoidance from seeds collected from 37 populations pre‐ and post‐drought in a common garden. In a parallel experiment, we evaluated fitness in two populations, one which thrived and one which was nearly extirpated during the drought, under well‐watered and dry‐down conditions. RESULTS We observed substantial variation among populations in trait evolution. In the subset of populations where phenotypes changed significantly, divergence proceeded along trait correlations with some populations flowering rapidly with less vegetative tissue accumulation and others delaying flowering with greater vegetative tissue accumulation. The degree of trait evolution was only weakly correlated with drought intensity but strongly correlated with initial levels of standing variation. Fitness was higher in the post‐drought than pre‐drought accessions in both treatments for the thriving population, but lower in both treatments for the nearly extirpated population. CONCLUSIONS Together, our results indicate that evolutionary responses to drought are context dependent and reflect the standing genetic variation and genetic correlations present within populations.

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A resurrection experiment finds evidence of both reduced genetic diversity and potential adaptive evolution in the agricultural weedIpomoea purpurea

Abstract: This article contains supporting information online at: xxx.

Cited by 13 publications

References 52 publications

Evidence for adaptive responses to historic drought across a native plant species range

Evidence for adaptive responses to historic drought across a native plant species range

Shifts in outcrossing rates and changes to floral traits are associated with the evolution of herbicide resistance in the common morning glory

Population responses to a historic drought across the range of the common monkeyflower (Mimulus guttatus)

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