A Pleistocene inter-tribal allopolyploidization event precedes the species radiation of Pachycladon (Brassicaceae) in New Zealand

Joly, Simon; Heenan, P. B.; Lockhart, Peter J.

doi:10.1016/j.ympev.2009.02.015

Cited by 61 publications

(89 citation statements)

References 56 publications

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“…Our data strongly advocate Pachycladon as a member of the paraphyletic tribe Camelineae as proposed by Al-Shehbaz et al (2006) and do not support the position of the maternal parent (the Brassica gene copy) close to the split of Lineage I and II (Joly et al, 2009). Although it is not possible to reject the null hypothesis of a single allopolyploid origin for Pachycladon and the Australian endemics, less diploidized (n = 10) Pachycladon species appear to originate and radiate on the South Island of New Zealand more recently (1.6 to 0.8 mya; Joly et al, 2009). Further studies of genome evolution within the genus Pachyladon are needed to elucidate its origin and relationship to endemic Australian crucifer species.…”

Section: Evolutionary Scenario Of the Mesopolyploid Wgd Eventcontrasting

confidence: 85%

“…The number of synonymous mutations in the nuclear genes suggests that the WGD at the origin of the Australian polyploids occurred ;5.9 mya (median range 3.7 to 8.7; see Supplemental Joly et al, 2009). CCP analysis showed that chromosome complements of both species are almost completely collinear with the ACK ( Figure 1D).…”

Section: Hypothesis Testing and Divergence Time Estimatesmentioning

confidence: 98%

“…The analyses were performed with a particular emphasis on Pachycladon species (Camelineae; Al-Shehbaz et al, 2006), which were also shown to have an allopolyploid origin (Joly et al, 2009).…”

Section: Hypothesis Testing and Divergence Time Estimatesmentioning

confidence: 99%

“…Because of the limited supply of material, we were unable to include three species (partly) analyzed by CCP (Blennodia canescens, Stenopetalum anfractum, and S. lineare). DNA extractions, PCR amplifications, cloning, and sequencing followed standard procedures (Franzke et al, 2009;Joly et al, 2009). Clone sequences that had >99% similarity with each others were assumed to come from a single gene copy, and only one representative clone was retained for the analyses (the sequence showing the fewer autapomorphies).…”

Section: Phylogeny Reconstructionmentioning

confidence: 99%

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Fast Diploidization in Close Mesopolyploid Relatives ofArabidopsis

et al. 2010

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Mesopolyploid whole-genome duplication (WGD) was revealed in the ancestry of Australian Brassicaceae species with diploid-like chromosome numbers (n = 4 to 6). Multicolor comparative chromosome painting was used to reconstruct complete cytogenetic maps of the cryptic ancient polyploids. Cytogenetic analysis showed that the karyotype of the Australian Camelineae species descended from the eight ancestral chromosomes (n = 8) through allopolyploid WGD followed by the extensive reduction of chromosome number. Nuclear and maternal gene phylogenies corroborated the hybrid origin of the mesotetraploid ancestor and suggest that the hybridization event occurred ;6 to 9 million years ago.The four, five, and six fusion chromosome pairs of the analyzed close relatives of Arabidopsis thaliana represent complex mosaics of duplicated ancestral genomic blocks reshuffled by numerous chromosome rearrangements. Unequal reciprocal translocations with or without preceeding pericentric inversions and purported end-to-end chromosome fusions accompanied by inactivation and/or loss of centromeres are hypothesized to be the main pathways for the observed chromosome number reduction. Our results underline the significance of multiple rounds of WGD in the angiosperm genome evolution and demonstrate that chromosome number per se is not a reliable indicator of ploidy level.

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Section: Evolutionary Scenario Of the Mesopolyploid Wgd Eventcontrasting

confidence: 85%

Section: Hypothesis Testing and Divergence Time Estimatesmentioning

confidence: 98%

Section: Hypothesis Testing and Divergence Time Estimatesmentioning

confidence: 99%

Section: Phylogeny Reconstructionmentioning

confidence: 99%

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Fast Diploidization in Close Mesopolyploid Relatives ofArabidopsis

et al. 2010

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“…Similarly, recent genome sequencing of Leavenworthia alabamica (Haudry et al, 2013), Camelina sativa (Kagale et al, 2014), and Brassica oleracea (Liu et al, 2014;Parkin et al, 2014) have uncovered more recent neo/mesopolyploidy events that formed the basis for the evolution of their hexaploid genomes. Comparative cytogenetic and molecular phylogenetic analyses have unveiled additional mesopolyploidy events in a few Australian and New Zealand crucifer genera belonging to the Microlepidieae and Heliophileae tribes that are endemic to Namibia and South Africa (Joly et al, 2009;Mandáková et al, 2010aMandáková et al, , 2010bMandáková et al, , 2012, implying a key role for recurring mesopolyploidy events in the diversification of the Brassicaceae. These data and the substantial numerical expansion of the chromosome complement from the base ancestral karyotype across the Brassicaceae suggest that the neo/mesopolyploidy events revealed so far could represent a fraction of the total.…”

Section: Introductionmentioning

confidence: 99%

Polyploid Evolution of the Brassicaceae during the Cenozoic Era

et al. 2014

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The Brassicaceae (Cruciferae) family, owing to its remarkable species, genetic, and physiological diversity as well as its significant economic potential, has become a model for polyploidy and evolutionary studies. Utilizing extensive transcriptome pyrosequencing of diverse taxa, we established a resolved phylogeny of a subset of crucifer species. We elucidated the frequency, age, and phylogenetic position of polyploidy and lineage separation events that have marked the evolutionary history of the Brassicaceae. Besides the well-known ancient a (47 million years ago [Mya]) and b (124 Mya) paleopolyploidy events, several species were shown to have undergone a further more recent (;7 to 12 Mya) round of genome multiplication. We identified eight whole-genome duplications corresponding to at least five independent neo/mesopolyploidy events. Although the Brassicaceae family evolved from other eudicots at the beginning of the Cenozoic era of the Earth (60 Mya), major diversification occurred only during the Neogene period (0 to 23 Mya). Remarkably, the widespread species divergence, major polyploidy, and lineage separation events during Brassicaceae evolution are clustered in time around epoch transitions characterized by prolonged unstable climatic conditions. The synchronized diversification of Brassicaceae species suggests that polyploid events may have conferred higher adaptability and increased tolerance toward the drastically changing global environment, thus facilitating species radiation.

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Ancient allopolyploidy in the everlasting daisies (Asteraceae: Gnaphalieae): Complex relationships among extant clades

Smissen

Galbany‐Casals

Breitwieser

2011

TAXON

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Phylogenetic analyses have suggested that the everlasting daisy tribe Gnaphalieae colonized the globe repeatedly and rapidly from southern Africa. However, both the circumscription of monophyletic groups of "out of Africa" Gnaphalieae genera and the identification of their sister groups in southern Africa has proved difficult. We have analysed sequences of nrDNA spacers (ITS, ETS), cpDNA (ndhF, trnL intron, trnL-trnF intergenic spacer, trnK intron), and low-copy nuclear markers to examine selected relationships within the crown radiation of the tribe. We focused on relationships among two putative clades suggested by previous studies and a representative sampling of genera endemic to Australasia. Incongruities between nrDNA and cpDNA trees are frequent and some involve robustly supported clades. However, trees generated for two lowcopy nuclear markers are largely congruent with each other but imply that allopolyploidy preceded the radiations of at least four separate extant lineages within the tribe, one largely or entirely restricted to Australasia, one almost global, and two still poorly sampled. Collectively, these four putative allopolyploid lineages may account for more than half of the described species diversity of the tribe.

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A Pleistocene inter-tribal allopolyploidization event precedes the species radiation of Pachycladon (Brassicaceae) in New Zealand

Cited by 61 publications

References 56 publications

Fast Diploidization in Close Mesopolyploid Relatives ofArabidopsis

Fast Diploidization in Close Mesopolyploid Relatives ofArabidopsis

Polyploid Evolution of the Brassicaceae during the Cenozoic Era

Ancient allopolyploidy in the everlasting daisies (Asteraceae: Gnaphalieae): Complex relationships among extant clades

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