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Nickrent, Daniel L.; Blarer, Albert; Qiu, Yin Long; Vidal‐Russell, Romina; Anderson, Frank E.

doi:10.1186/1471-2148-4-40

Cited by 111 publications

(49 citation statements)

References 50 publications

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“…Moreover, a disproportionately large number of the reported HGT events involve parasitic plants (Mower et al 2004, Davis andWurdack 2004;Nickrent et al 2004;Davis et al 2005), providing evidence for direct plant-to-plant transmission of DNA from parasite to host as one potential mechanism of HGT in plants. While some Cuscuta species were explicitly involved in one of those events of HGT (Mower et al 2004), it is highly unlikely that any of the five instances of incongruence encountered in the present study could be explained by these means.…”

Section: Alternative Explanations For the Observed Plastid-nuclear DImentioning

confidence: 96%

Reticulate evolution in the parasitic genusCuscuta(Convolvulaceae): over and over againThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

Stefanović

Costea

2008

Botany

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The frequency and relative importance of hybridization in plants has been an area of intense debate. Although this evolutionary phenomenon has received considerable attention from plant biologists, there are no well-supported cases of reticulate evolution involving parasitic plants, to date. Recent molecular phylogenetic analyses revealed that the subgenus Grammica, the largest and most diverse group of the stem-parasitic genus Cuscuta (dodder), consists of 15 major clades. We describe here five cases of strongly supported discordance between phylogenies derived from plastid and nuclear data, and interpret them as results of five independent hybridization events. Three of these cases could represent relatively recent reticulations, as each of them involves more closely related species, always confined within the same major clade as their putative parental species, and are currently sympatric or parapatric with them. The two remaining cases involve species whose potential progenitors are derived from different major groups of Grammica, and which are allopatric in their present distribution. A series of statistical tests was conducted to assess and further explore the significance of this phylogenetic incongruence. Alternative explanations for discordant gene topologies are explored. Cuscuta liliputana sp. nov., a new Mexican species of hybrid origin is described.Résumé : La fréquence et l'importance relative de l'hybridation chez les plantes soulèvent d'intenses débats. Bien que ce phénomène évolutif ait reçu beaucoup d'attention de la part des phytobiologistes, à ce jour, on ne connaît pas de cas bien établi d'évolution réticulée impliquant des plantes parasites. Des analyses phylogénétiques récentes révèlent que le sousgenre Grammica, le groupe le plus important et le plus diversifié du parasite caulinaire Cuscuta (cuscute), comporte 15 clades principaux. Les auteurs décrivent cinq cas de discordance bien établis entre les phylogénies dérivées de données plastidiques et nucléiques; ils les interprètent comme les résultats de cinq évènements d'hybridation indépendants. Trois de ces cas pourraient représenter des réticulations relativement récentes, puisque chacun d'eux implique des espèces plus étroitement apparentées, toujours confinées au même clade principal que leurs parents, et présentement sympatriques ou parapatriques avec eux. Les deux autres cas impliquent des espèces dont les progéniteurs potentiels dérivent de groupes majeurs distincts du Grammica, et qui sont actuellement allopatriques. Les auteurs ont conduit une série de tests statistiques pour évaluer et explorer la signification de cette inadéquation phylogénétique. Ils explorent des explications alternatives à ces discordances dans la distribution topologique des gènes. Ils décrivent le Cuscuta liliputana sp. nov., une nouvelle espèce mexicaine d'origine hybride.

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Section: Alternative Explanations For the Observed Plastid-nuclear DImentioning

confidence: 96%

Reticulate evolution in the parasitic genusCuscuta(Convolvulaceae): over and over againThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

Stefanović

Costea

2008

Botany

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“…This is a plausible explanation because plant mitochondrial genes are sometimes exchanged between species [17-20], and most known cases of HGT come from parasitic plants, which have permanent tissue contact with their hosts [8,16,21-24]. Even nuclear DNA can be transferred between parasites and their hosts [25].…”

Section: Introductionmentioning

confidence: 99%

The worldwide holoparasitic Apodanthaceae confidently placed in the Cucurbitales by nuclear and mitochondrial gene trees

Filipowicz¹,

Renner²

2010

BMC Evol Biol

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Background: Of the c. 450 families of flowering plants, only two are left "unplaced" in the most recent APG classification of angiosperms. One of these is the Apodanthaceae, a clade of c. 19 holoparasitic species in two or three genera occurring in North and South America, Africa, the Near East, and Australia. Because of lateral gene transfer between Apodanthaceae and their hosts it has been difficult to infer the family's true closest relatives. Results: Here we report a phylogenetic analysis of 16 accessions representing six species of Apodanthaceae from the United States, Chile, Iran, and Australia, using the mitochondrial matR gene and the nuclear 18S gene. Data matrices include 190 matR sequences from up to 95 families in 39 orders of flowering plants and 197 18S sequences from 101 families representing the 16 orders of rosids. Analyses were performed at the nucleotide and at the amino acid level. Both gene trees agree with angiosperm phylogenies found in other studies using more genes. Apodanthaceae and the seven families of the order Cucurbitales form a clade with 100% bootstrap support from matR and 56% from 18 S. In addition, the Apodanthaceae and Cucurbitales matR gene sequences uniquely share two non-synonymous codon changes and one synonymous change, as well as a codon insertion, already found by Barkman et al. (2007).

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“…The acquired genes may also be derived from different donor groups including viruses, bacteria, fungi, and other plants [6,33,57,58]. Many other cases of HGT have been reported in land plants, but cannot be detailed here [37,52,[59][60][61][62][63][64]. To sum up, while HGT in plants may not be as frequent as in prokaryotes or unicellular eukaryotes, it still plays an important role in some essential or plant-specific activities and has had a significant impact on the evolution of land plants.…”

Section: Discussionmentioning

confidence: 98%