Patterns of weed invasion: evidence from the spatial genetic structure of Raphanus raphanistrum

Barnaud, Adéline; Kalwij, Jesse M.; McGeoch, Mélodie A.; Vuuren, Bettine Jansen van

doi:10.1007/s10530-013-0465-4

Cited by 15 publications

(12 citation statements)

References 59 publications

(73 reference statements)

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“…we differ in this conclusion (Cousens et al, 2013) from Cody & Cody (2004)) and there is no longer any evidence of genome mixing detectable in the nuclear microsatellite data. Foreign chloroplast frequencies can be close to 50% or higher, as has been found with Raphanus sativus introgression into R. raphanistrum (Barnaud et al, 2013). Most neutral C. edentula traits determined by nuclear genes will disappear after only a few generations of back-crossing to C. maritima (pollinators are attracted more to C. maritima than to C. edentula: Rodman, 1974).…”

Section: Discussionmentioning

confidence: 74%

Genetic structure along the strandline: Unravelling invasion history in a one‐dimensional system

Ohadi

Ades

Ford

et al. 2015

Journal of Biogeography

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Aim To unravel the genetic processes involved in a case of invasion by one species, the self-incompatible Cakile maritima Scop. (Brassicaceae) in Australia, as it has replaced a related prior invader, Cakile edentula (Bigelow) Hook.Location Southern and eastern coastlines of Australia.Methods Genetic diversity within and between populations was characterized at a continental scale using microsatellite (SSR) markers to examine nuclear diversity and cleaved amplified polymorphic sequence (CAPS) markers to examine chloroplasts. DNA was sourced from 24 populations of C. maritima along its putative invasion trajectory and, for comparison, from four populations of C. edentula that are currently being invaded by C. maritima. Analysis of Molecular Variance and a Bayesian assignment method were used to explore the data.Results No evidence was found for progressive loss of diversity in C. maritima in the putative direction of range expansion. Western and south-eastern populations of C. maritima have almost certainly resulted from independent introductions, although there is evidence of very limited gene flow from west to east. There was considerably greater, spatially structured variation in the southeast, suggesting multiple introductions of C. maritima to that region. We found evidence of hybridization and introgression from C. edentula into C. maritima, both in the two regions where they are currently sympatric and elsewhere. Main conclusionsThe invasion history of a species spreading in a largely one-dimensional habitat can still be highly complex and difficult to interpret. Regional patterns of variation in C. maritima indicate several introductions from different parts of the native range, limited gene flow from the first introduction eastwards and genetic drift within Western Australia. There has also been bi-directional gene flow between this species and C. edentula. The significance of the introgression from C. edentula into C. maritima with respect to natural selection, however, remains to be determined.

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Section: Discussionmentioning

confidence: 74%

Genetic structure along the strandline: Unravelling invasion history in a one‐dimensional system

Ohadi

Ades

Ford

et al. 2015

Journal of Biogeography

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“…On the other hand, chloroplast DNA (cpDNA) is inherited maternally in angiosperms. It is used to detect the maternal parents of hybrids (Bleeker, 2003;Muranishi et al, 2013) and also in studies of invasions (Bleeker, 2003;Gaskin et al, 2005;Barnaud et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Development of chloroplast DNA markers in Japanese Imperata cylindrica

2015

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Imperata cylindrica (cogongrass) is one of the most invasive grass weeds found worldwide. In Japan, this grass grows as three climate types: cool temperate (CT), common (CM) and subtropical (ST). An early flowering (E) type has been also reported. Among them, the CM type is large and most invasive. Recent global warming may cause the extension of distribution of the CM type to northern parts of Japan and may allow hybrids to form between the CM and CT or E types. The hybrids sometimes show heterosis and this leads to new weed problems. Distinguishing between the hybrids and parents on a morphological basis is difficult. We investigated polymorphisms of eight cpDNAs to enable distinction between the ecotypes and the hybrids. Fourteen haplotypes were detected in 33 Japanese clones, based on variations in eight cpDNA regions. Based on three substitutions in the psbA-matK spacer, the ORF170 intron1, the trnL (UAA) intron-trnF(GAA) spacer and indels in the trnL(UAA) intron-trnF(GAA) spacer, the haplotypes were clustered into three phylogenetic groups: I, IIa and IIb, which corresponded with the CM and ST, E and CT types, respectively. The polymorphism in the cpDNA therefore enables us to distinguish among the ecotypes and is useful for prediction of the range expansion of the CM type.

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“…Wild radish has successfully colonized a variety of locations, leading to its naturalization on all continents except Antarctica (Holm, Doll, Holm, Pancho, & Herberger, ), and it is often a major agricultural weed (Sahli, Conner, Shaw, Howe, & Lale, ; Warwick & Francis, ). Studies on the geographic distribution of the genetic variability and morphological traits of wild radish have shown that divergence between populations does not correspond to a geographic pattern that can be attributed to isolation distance (Barnaud, Kalwij, McGeoch, & van Vuuren, ; Kercher & Conner, ; Sahli et al, ; Tokunaga & Ohnishi, ). Kercher and Conner () have suggested three possible explanations for this observation: (a) wild radish self‐incompatibility promotes gene flow, (b) radish seeds can disperse over long distances, and (c) introgression occurs from the cultivated radish ( R. sativus ).…”

Section: Introductionmentioning

confidence: 99%

Morphological differences among Raphanus raphanistrum populations and their relationship to related crops

Liu

Darmency

2019

Plant Breeding

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Wild radish (Raphanus raphanistrum) has developed introgressed populations after hybridization with its cultivated counterpart (R. sativus) in California. Hybridization with various Brassica and Sinapis species is also possible. To determine if hybridization is responsible of the genetic diversity of European populations, six wild radish populations with distinct morphological traits were sampled from geographically distant regions in Europe. Plants were cultivated in an oilseed rape field and in insect‐proof cages. Silique and flower morphology, growth, and reproductive traits were measured. The wild radish populations could be discriminated by the morphological traits, but not related to geographic regions. In particular, populations of one region showed wide variability in terms of silique shape and growth behaviour, and small‐sized flowers. Although the origin of morphological diversity in wild radish is unclear, i.e. native or due to gene flow from the cultivated radish or other Brassicaceae, significant morphological divergence was found that could have relevant effects on plant ecology and adaptation.

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Patterns of weed invasion: evidence from the spatial genetic structure of Raphanus raphanistrum

Cited by 15 publications

References 59 publications

Genetic structure along the strandline: Unravelling invasion history in a one‐dimensional system

Genetic structure along the strandline: Unravelling invasion history in a one‐dimensional system

Development of chloroplast DNA markers in Japanese Imperata cylindrica

Morphological differences among Raphanus raphanistrum populations and their relationship to related crops

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