Are road verges corridors for weed invasion? Insights from the fine‐scale spatial genetic structure of <i><scp>R</scp>aphanus raphanistrum</i>

Barnaud, Adéline; Kalwij, Jesse M.; Berthouly‐Salazar, Cécile; McGeoch, Mélodie A.; Vuuren, Bettine Jansen van

doi:10.1111/wre.12033

Cited by 13 publications

(13 citation statements)

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“…Information on the amount and structure of neutral genetic variation between native and invasive populations is important for understanding the dynamics of introduction and spread of invasive species (Marrs et al ., ). Genetic variation is critical in the development of control strategies for invasive species, because it helps to predict invasiveness in a new habitat and evolutionary potential in response to management practices (Wilson et al ., ; Barnaud et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Genetic variation and structure in native and invasive Solidago canadensis populations

et al. 2014

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Solidago canadensis is native to North America, but has become a noxious invasive plant in China. We know only a little about its invasion history and the effects of introductions on its genetic composition. Here, we investigated genetic variation and structure between 15 North American and 13 Chinese populations of S. canadensis using AFLP makers. Four AFLP loci suggested relatively high genetic diversity of this weed and similar genetic variation between the invasive range and the native range. Most genetic variation was within populations across two ranges, but the Chinese range had a higher degree of among-population variation than the North American range. Multiple tests, including Bayesian assignment, UPGMA analysis, PCoA and analysis of 'isolation by distance', showed that the Chinese populations originated from at least two distinct native sources and that secondary introduction or dispersal should be common in China. Also, North American populations were possibly a single genetic group. Overall, S. canadensis in China was probably founded from multiple introductions and then spread through long-distance dispersal associated with human activities. Genetic variability in the species in the invaded range appears to have favoured establishment and spread and may well provide a challenge to successful control.

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Section: Introductionmentioning

confidence: 97%

Genetic variation and structure in native and invasive Solidago canadensis populations

et al. 2014

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“…Studies have shown that weedy radish lacks a signal of isolation by distance (Barnaud, Kalwij, Berthouly-Salazar, McGeoch, & Jansen van Vuuren, 2013;Kercher & Conner, 1996), likely due to human-mediated movement of large numbers of seeds long distances as a contaminant of grain and other agricultural products (Cheam, 2006;Holm, 1997;Snow & Campbell, 2005).…”

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confidence: 99%

Weed evolution: Genetic differentiation among wild, weedy, and crop radish

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Lale

et al. 2018

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Approximately 200 weed species are responsible for more than 90% of crop losses and these comprise less than one percent of all named plant species, suggesting that there are only a few evolutionary routes that lead to weediness. Agricultural weeds can evolve along three main paths: they can be escaped crops, wild species, or crop‐wild hybrids. We tested these three hypotheses in weedy radish, a weed of small grains and an emerging model for investigating the evolution of agricultural weeds, using 21 CAPS and SSR markers scored on 338 individuals from 34 populations representing all major species and sub‐species in the radish genus Raphanus. To test for adaptation of the weeds to the agricultural environment, we estimated genetic differentiation in flowering time in a series of common garden experiments with over 2,400 individuals from 43 populations (all but one of the genotyped populations plus 10 additional populations). Our findings suggest that the agricultural weed radish R. r. raphanistrum is most genetically similar to native populations of R. r. raphanistrum and is likely not a feral crop or crop hybrid. We also show that weedy radish flowers more rapidly than any other Raphanus population or cultivar, which is consistent with rapid adaptation to the frequent and severe disturbance that characterizes agricultural fields.

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“…These findings are consistent with previous results for other self‐incompatible, insect‐pollinated weed species. In Raphanus raphanistrum L. (wild radish), no genetic structure and low genetic differentiation ( F ST = 0.02) were observed within regional landscapes where the species was thought to disperse along roads (Barnaud et al ., ). In P. rhoeas , a low level of genetic differentiation ( F ST = 0.04) was observed between populations sampled within cereal fields separated by distances of the order of a few tens of kilometres (Kati et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Genetic diversity of the declining arable plant Centaurea cyanus: population fragmentation within an agricultural landscape is not associated with enhanced spatial genetic structure

et al. 2014

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Summary Agricultural intensification has recently resulted in the decrease in frequency and abundance of arable weed species. This includes the previously widespread Centaurea cyanus, whose populations are now fragmented and infrequent in western Europe. The consequences of habitat modification and fragmentation in terms of genetic diversity of the remaining populations have not yet been addressed. We used ten microsatellite markers to assess the genetic diversity and genetic structure of populations contained in an agricultural landscape in north‐eastern France. The ten microsatellites were all highly polymorphic. Centaurea cyanus appears to be a genetically variable species, with high levels of genetic diversity within each cultivated field. Genetic structure was investigated using a Bayesian method. The partitioning of the genetic variation into three clusters was not associated with sampling locations, and most individuals were admixed. These results suggest that the cornflower populations investigated may have multiple origins in the past and that genetic variation has been reshuffled by human transportation of seeds. Thus, anthropogenic dispersal associated with farming activities is probably a major factor driving the structure of genetic diversity in arable land plants. Despite low levels of genetic differentiation between populations, fine‐scale spatial genetic structure was observed within populations, suggesting limited local dispersal. We conclude that in areas where C. cyanus has become rare, the recent fragmentation of populations may in the future cause a loss of genetic diversity and even extinction.

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Are road verges corridors for weed invasion? Insights from the fine‐scale spatial genetic structure of Raphanus raphanistrum

Cited by 13 publications

References 51 publications

Genetic variation and structure in native and invasive Solidago canadensis populations

Genetic variation and structure in native and invasive Solidago canadensis populations

Weed evolution: Genetic differentiation among wild, weedy, and crop radish

Genetic diversity of the declining arable plant Centaurea cyanus: population fragmentation within an agricultural landscape is not associated with enhanced spatial genetic structure

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