The biology of Canadian weeds. 133. Cuscuta campestris Yuncker, C. gronovii Willd. ex Schult., C. umbrosa Beyr. ex Hook., C. epithymum (L.) L. and C. epilinum Weihe.

Costea, Mihai; Tardif, François J.

doi:10.4141/p04-077

Cited by 83 publications

(53 citation statements)

References 149 publications

(250 reference statements)

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“…Within a locality, multiple specimens were collected growing on separate host plants (> 1 m apart from each other). Despite the host separation, some of the specimens still could be a product of multiple individual seedlings infecting a plant (Costea and Tardif 2006), and we considered these to be “bulked” individuals. Therefore, when available, for a number of samples, we collected seed as well.…”

Section: Methodsmentioning

confidence: 99%

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Cladogenesis and reticulation in Cuscuta sect. Denticulatae (Convolvulaceae)

et al. 2018

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As traditionally circumscribed, Cuscuta sect. Denticulatae is a group of three parasitic plant species native to the deserts of Western USA ( Cuscuta denticulata , Cuscuta nevadensis ) and the central region of Baja California, Mexico ( Cuscuta veatchii ). Molecular phylogenetic studies confirmed the monophyly of this group and suggested that the disjunct C. veatchii is a hybrid between the other two species. However, the limited sampling left the possibility of alternative biological and methodological explanations. We expanded our sampling to multiple individuals of all the species collected from across their entire geographical ranges. Sequence data from the nuclear and plastid regions were used to reconstruct the phylogeny and find out if the topological conflict was maintained. We obtained karyotype information from multiple individuals, investigated the morphological variation of the group thorough morphometric analyses, and compiled data on ecology, host range, and geographical distribution. Our results confirmed that C. veatchii is an allotetraploid. Furthermore, we found previously unknown autotetraploid population of C. denticulata , and we describe a new hybrid species, Cuscuta psorothamnensis . We suggest that this newly discovered natural hybrid is resulting from an independent (and probably more recent) hybridization event between the same diploid parental species as those of C. veatchii . All the polyploids showed host shift associated with hybridization and/or polyploidy and are found growing on hosts that are rarely or never frequented by their diploid progenitors. The great potential of this group as a model to study host shift in parasitic plants associated with recurrent allopolyploidy is discussed. Electronic supplementary material The online version of this article (10.1007/s13127-018-0383-5) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

“…Approximately 15–20 Cuscuta spp. worldwide are agricultural and horticultural pests (Dawson et al 1994; Costea and Tardif 2006), and in most countries, control and quarantine measures target the genus as a whole, ignoring the fact that some species may be endangered or even threatened with extinction (Costea and Stefanović 2009). …”

Section: Introductionmentioning

confidence: 99%

Cladogenesis and reticulation in Cuscuta sect. Denticulatae (Convolvulaceae)

et al. 2018

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“…Dodders are important both economically and ecologically. A few species can produce considerable losses to agricultural crops (Parker and Riches 1993;Costea and Tardif 2006). The majority of Cuscuta species, however, act as keystone species in their natural ecosystems (reviewed by Press and Phoenix 2005).…”

Section: Introductionmentioning

confidence: 99%

Systematics of “horned” dodders: phylogenetic relationships, taxonomy, and two new species within the Cuscuta chapalana complex (Convolvulaceae)

CosteaMihai

García

StefanovićSaša

2011

Botany

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The Cuscuta chapalana complex (Convolvulaceae) is a recently circumscribed clade within the subgenus Grammica that includes several little-known species from Mexico and Central and northern South America characterized by the presence of peculiar subapical multicelullar appendages on the corolla and often on the calyx lobes. Basic morphology, scanning electron microscopy, and DNA sequence data from the plastid trnL-F region and the 26S rDNA and internal transcribed spacer nuclear regions were used to investigate the phylogenetic relationships within the group and to test the species limits. Multicellular appendages are horn-like or tubular in shape and bear one or more stomata at their tips; hence the vernacular name "horned" dodders. Eight lineages were reconstructed; two of them, both from Mexico, were described as new species: Cuscuta bonafortunae Costea & I. García, sp. nov., and Cuscuta carnosa Costea & Stefanović, sp. nov. Cuscuta pringlei is redefined as a variety of Cuscuta strobilacea. A taxonomic treatment with an identification key, descriptions, and illustrations is provided. Résumé : Le complexe Cuscuta chapalana (Convolvulaceae) constitue un clade récemment circonscrit récement circonscrit dedans le sous-genre Grammica incluant plusieurs espèces peu connues du Mexique, du centre et du nord de l'Amérique du Sud, caractérisées par la présence d'appendices subapicales multicellulaires particulières sur la corolle, et souvent sur les lobes du calice. A fin d'examiner les relations phylogénétiques dans ce groupe et vérifier les limites des espèces, les auteurs ont utilisé les données morphologiques générales, la microscopie électronique à balayage et les séquences de l'ADN provenant de la région plastidique trnL-F et des régions nucléaires de 26S rADN et de l'espaceur interne transcrit (ITS). Les appendices multicellulaires prennent la forme d'une corne ou d'un tube, et portent un ou plusieurs stomates à leur apex, d'où le nom vernaculaire de cuscute cornue. Ils ont reconstruit huit lignées; ils décrivent deux d'entre elles, toutes deux du Mexique, comme espèces nouvelles : Cuscuta bonafortunae Costea & I. García, sp. nov. et Cuscuta carnosa Costea & Stefanović, sp. nov. On redéfinit le Cuscuta pringlei comme une variété du Cuscuta strobilacea. Les auteurs fournissent un traitement taxonomique avec une clé d'identification, des descriptions et des illustrations.

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“…This genus is cosmopolitan in its distribution, but the majority of the species diversity (~140 out of 200 species) is encountered in the Americas (Yuncker, 1932; Stefanović et al, 2007). Cuscuta is considered economically important because several species can cause significant losses to agricultural crops (Parker and Riches, 1993; Costea and Tardiff, 2006). However, many Cuscuta species are also ecologically important, acting as keystone species in their natural ecosystems (Press and Phoenix, 2005), and some dodders are in need of conservation (Costea and Stefanović, 2009).…”

Section: Introductionmentioning

confidence: 99%

Plastid genome evolution across the genus Cuscuta (Convolvulaceae): two clades within subgenus Grammica exhibit extensive gene loss

Braukmann¹,

Kuzmina²,

Stefanović³

2013

Journal of Experimental Botany

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The genus Cuscuta (Convolvulaceae, the morning glory family) is one of the most intensely studied lineages of parasitic plants. Whole plastome sequencing of four Cuscuta species has demonstrated changes to both plastid gene content and structure. The presence of photosynthetic genes under purifying selection indicates that Cuscuta is cryptically photosynthetic. However, the tempo and mode of plastid genome evolution across the diversity of this group (~200 species) remain largely unknown. A comparative investigation of plastid genome content, grounded within a phylogenetic framework, was conducted using a slot-blot Southern hybridization approach. Cuscuta was extensively sampled (~56% of species), including groups previously suggested to possess more altered plastomes compared with other members of this genus. A total of 56 probes derived from all categories of protein-coding genes, typically found within the plastomes of flowering plants, were used. The results indicate that two clades within subgenus Grammica (clades ‘O’ and ‘K’) exhibit substantially more plastid gene loss relative to other members of Cuscuta. All surveyed members of the ‘O’ clade show extensive losses of plastid genes from every category of genes typically found in the plastome, including otherwise highly conserved small and large ribosomal subunits. The extent of plastid gene losses within this clade is similar in magnitude to that observed previously in some non-asterid holoparasites, in which the very presence of a plastome has been questioned. The ‘K’ clade also exhibits considerable loss of plastid genes. Unlike in the ‘O’ clade, in which all species seem to be affected, the losses in clade ‘K’ progress phylogenetically, following a pattern consistent with the Evolutionary Transition Series hypothesis. This clade presents an ideal opportunity to study the reduction of the plastome of parasites ‘in action’. The widespread plastid gene loss in these two clades is hypothesized to be a consequence of the complete loss of photosynthesis. Additionally, taxa that would be the best candidates for entire plastome sequencing are identified in order to investigate further the loss of photosynthesis and reduction of the plastome within Cuscuta.

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The biology of Canadian weeds. 133. Cuscuta campestris Yuncker, C. gronovii Willd. ex Schult., C. umbrosa Beyr. ex Hook., C. epithymum (L.) L. and C. epilinum Weihe.

Cited by 83 publications

References 149 publications

Cladogenesis and reticulation in Cuscuta sect. Denticulatae (Convolvulaceae)

Cladogenesis and reticulation in Cuscuta sect. Denticulatae (Convolvulaceae)

Systematics of “horned” dodders: phylogenetic relationships, taxonomy, and two new species within the Cuscuta chapalana complex (Convolvulaceae)

Plastid genome evolution across the genus Cuscuta (Convolvulaceae): two clades within subgenus Grammica exhibit extensive gene loss

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