The frequency of polyploid speciation in vascular plants

Wood, Troy E.; Takebayashi, Naoki; Barker, Michael S.; Mayrose, Itay; Greenspoon, Philip B.; Rieseberg, Loren H.

doi:10.1073/pnas.0811575106

Cited by 1,145 publications

(997 citation statements)

References 28 publications

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“…Closely related taxa often differ by a least a few structural rearrangements, and more distantly related taxa within genera often differ in chromosome number as well. In plants, polyploidy is an important source of chromosomal change, and doublings or near-doublings in chromosome number within families are often assumed to result from tetraploidy events (Jones, 1998;Wood et al, 2009). Nonetheless, changes in chromosome number between sister lineages may also occur by chromosome fission and fusion (Schubert and Lysak, 2011).…”

Section: Introductionmentioning

confidence: 99%

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Fishman

et al. 2014

Heredity

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Changes in chromosome number and structure are important contributors to adaptation, speciation and macroevolution. In flowering plants, polyploidy and subsequent reductions in chromosome number by fusion are major sources of chromosomal evolution, but chromosome number increase by fission has been relatively unexplored. Here, we use comparative linkage mapping with gene-based markers to reconstruct chromosomal synteny within the model flowering plant genus Mimulus (monkeyflowers). Two sections of the genus with haploid numbers X14 have been inferred to be relatively recent polyploids because they are phylogenetically nested within numerous taxa with low base numbers (n ¼ 8-10). We combined multiple data sets to build integrated genetic maps of the M. guttatus species complex (section Simiolus, n ¼ 14) and the M. lewisii group (section Erythranthe; n ¼ 8), and then aligned the two integrated maps using 4100 shared markers. We observed strong segmental synteny between M. lewisii and M. guttatus maps, with essentially 1-to-1 correspondence across each of 16 chromosomal blocks. Assuming that the M. lewisii (and widespread) base number of 8 is ancestral, reconstruction of 14 M. guttatus chromosomes requires at least eight fission events (likely shared by Simiolus and sister section Paradanthus (n ¼ 16)), plus two fusion events. This apparent burst of fission in the yellow monkeyflower lineages raises new questions about mechanisms and consequences of chromosomal fission in plants. Our comparative maps also provide insight into the origins of a chromosome exhibiting centromere-associated female meiotic drive and create a framework for transferring M. guttatus genome resources across the entire genus.

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Section: Introductionmentioning

confidence: 99%

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Fishman

et al. 2014

Heredity

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“…Polyploidy (or whole-genome doubling (WGD)) is a key mechanism for plant speciation leading to new evolutionary lineages [1,2]. Several lines of evidence show that most species among flowering plants had polyploidy ancestry [3,4].…”

Section: Introductionmentioning

confidence: 99%

Aberrant Classopollis pollen reveals evidence for unreduced (2 n ) pollen in the conifer family Cheirolepidiaceae during the Triassic–Jurassic transition

2013

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Polyploidy (or whole-genome doubling) is a key mechanism for plant speciation leading to new evolutionary lineages. Several lines of evidence show that most species among flowering plants had polyploidy ancestry, but it is virtually unknown for conifers. Here, we study variability in pollen tetrad morphology and the size of the conifer pollen type Classopollis extracted from sediments of the Triassic-Jurassic transition, 200 Ma. Classopollis producing Cheirolepidiaceae were one of the most dominant and diverse groups of conifers during the Mesozoic. We show that aberrant pollen Classopollis tetrads, triads and dyads, and the large variation in pollen size indicates the presence of unreduced (2n) pollen, which is one of the main mechanisms in modern polyploid formation. Polyploid speciation may explain the high variability of growth forms and adaptation of these conifers to different environments and their resistance to extreme growth conditions. We suggest that polyploidy may have also reduced the extinction risk of these conifers during the End-Triassic biotic crisis.

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“…Recent studies show that all of flowering plants undertake one or more ancient genome doubling events (Wood et al 2009;Conant et al 2014;Woodhousea et al 2014;Moghe and Shiu 2014). Additional, there are also high frequency of polyploid events among most important crops such as maize, rape, coffee, cotton, wheat and so on (Hilu 1993;Chen 2007;Matsushita et al 2012).…”

Section: Introductionmentioning

confidence: 99%

The effect of different genome and cytoplasm on meiotic pairing in maize newly synthetic polyploids

et al. 2015

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Allopolyploidization plays the special role in the evolution of many crops. Moreover, the evolution in early stage of some allopolyploidization events is predicted to be effected by nuclear-cytoplasmic interactions. Maize and teosintes are well model system for study of genetic recombination in allopolyploidization. In order to investigate the effects of genome organization and cytoplasm on genome evolution in newly synthesized allopolyploids (neoallopolyploids), a series of neoallopolyploids were produced by reciprocal crosses of maize and Zea perennis. By using dual-color genomic in situ hybridization, intra-and intergenomic meiosis pairing of these polyploids were quantified and compared with regard to its genome organization and cytoplasm background. In the four neoallopolyploids, the stability of maize genome is consistently lower than that of Z. perennis genome. Additional, the stability of maize genome is affected by genome ploidy. The cytoplasm, genome composition and their interaction do have the special role in chromosome paring and the meiosis behaviors in Zea allopolyploids vary significantly and showed non-diploidization. Z. perennis cytoplasm may give a relatively relaxed environment for maize genome.

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The frequency of polyploid speciation in vascular plants

Cited by 1,145 publications

References 28 publications

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Aberrant Classopollis pollen reveals evidence for unreduced (2 n ) pollen in the conifer family Cheirolepidiaceae during the Triassic–Jurassic transition

The effect of different genome and cytoplasm on meiotic pairing in maize newly synthetic polyploids

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