Tetrasomic inheritance and isozyme variation in Turnera ulmifolia vars. elegans Urb. and intermedia Urb. (Turneraceae)

Shore, Joel S.

doi:10.1038/hdy.1991.39

Cited by 40 publications

(22 citation statements)

References 26 publications

(12 reference statements)

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“…Multiple origin of polyploid species is now considered the rule rather than the exception [Soltis and Sol tis, 1999]. It has been demonstrated for several allopolyploids Abbott and Lowe, 2004;Soltis et al, 2004;Arrigo et al, 2010] and autopolyploids [Shore, 1991;Segraves et al, 1999;Soltis and Soltis, 1999;Parisod and Besnard, 2007], despite notable exceptions such as Arabidopsis suecica [Jakobsson et al, 2006] or Draba ladina [Widmer and Baltisberger, 1999]. Noticeably, multiple origins may occur over restricted geographical distributions and/or short evolutionary timescales as illustrated by the allopolyploid Tragopogon miscellus that formed at least 21 times independently during the last 50-60 years .…”

Section: Multiple Origins and Multiple Pathways Produce Variable Polymentioning

confidence: 99%

Natural Pathways to Polyploidy in Plants and Consequences for Genome Reorganization

Tayalé

Parisod²

2013

Cytogenet Genome Res

129

117

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The last decade highlighted polyploidy as a rampant evolutionary process that triggers drastic genome reorganization, but much remains to be understood about their causes and consequences in both autopolyploids and allopolyploids. Here, we provide an overview of the current knowledge on the pathways leading to different types of polyploids and patterns of polyploidy-induced genome restructuring and functional changes in plants. Available evidence leads to a tentative ‘diverge, merge and diverge' model supporting polyploid speciation and stressing patterns of divergence between diploid progenitors as a suitable predictor of polyploid genome reorganization. The merging of genomes at the origin of a polyploid lineage may indeed reveal different kinds of incompatibilities (chromosomal, genic and transposable elements) that have accumulated in diverging progenitors and reduce the fitness of nascent polyploids. Accordingly, successful polyploids have to overcome these incompatibilities through non-Mendelian mechanisms, fostering polyploid genome reorganization in association with the establishment of new lineages. See also sister article focusing on animals by Collares-Pereira et al., in this themed issue.

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Section: Multiple Origins and Multiple Pathways Produce Variable Polymentioning

confidence: 99%

Natural Pathways to Polyploidy in Plants and Consequences for Genome Reorganization

Tayalé

Parisod²

2013

Cytogenet Genome Res

129

117

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“…There have been many recent studies of natural polyploid complexes, where either unilateral or bilateral sexual polyploidization has been proposed, as the mechanism of origin (Gadella, 1988;Shoemaker-Megalos & Ballington, 1988;Negri & Veronesi, 1989;Ness, Soltis & Soltis, 1989;Bringhurst, 1990;Lumaret & Barrientos, 1990;Orjeda et al, 1990;Van Dijk & Van Delden, 1990;Jay et al, 1991;Shore, 1991;Rabe & Haufier, 1992). The analysis of allopolyploidization, including all the intermediates between the extreme categories of auto-and allopolyploidization (see Stebbins, 1947;Lewis, 1980) suggest that the production of 2n gametes may have played a role in the creation of new polyploids by hybridization (see Dodson & Dodson, 1976;Briggs & Walters, 1984;Eckenwalder & Brown, 1986).…”

Section: Role Of Polyploidymentioning

confidence: 99%

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

1995

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summary The production of 2n gametes in plants, i.e. gametes with a somatic chromosome number, is considered to be the dominant process involved in the origin of polyploid plants. In this review, we provide a synthesis of current knowledge concerning the production of 2n gametes. Firstly, we describe the different methods used to detect and quantify the production of 2n gametes in plants, which include morphological and flow cytometry screening of the occurrence of 2n pollen, the analysis of crosses among diploid and tetraploid parents and the instigation of micro‐and mega‐sporogenesis. Secondly, the high level of inter‐ and infra‐specific variation in 2n gametes production is described. Thirdly, the various cytological anomalies responsible for the production of 2n gametes are reviewed, with particular reference to the relative genetic consequences of the first and second restitution divisions that give rise to 2n gametes. Fourthly, the significance of 2n gametes in crop plant improvement is discussed, in relation to somatic chromosome doubling to obtain new polyploid varieties. In particular, we compare the genetic and yield consequences of methods based on unilateral and bilateral sexual polyploidization. Finally, we outline how knowledge of the variety of mechanisms involved in 2n gamete production have increased our understanding of the evolutionary significance of polyploidy and the population biology of polyploid plants.

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“…The levels of genetic diversity in P. chinense was higher than that of other endangered species, for example, Aster kantoensis growing in the river bed were 1.53 (A), 0.36(P) and 0.142 (h) [14]. And other endangered species showed A (1.44 to 2.01), P (0.199 to 0.65) and h (0.037 to 0.43) [15]- [18]. …”

Section: Genetic Diversitymentioning

confidence: 99%

Genetic Diversity of Restored Endangered Species, Penthorum Chinense in the Riverbed

Masuda¹

2016

Geomate

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ABSTRACT:The Ministry of Land, Infrastructure and Transport has done the business of digging on the river road to increase the flowing quantity of Ibi River every year since 2000. It is reported to the dug region the Penthorum chinense populations which is the threatened species the restored in 2001. Digging is done from 2000 to 2010 every year. Therefore, we investigated P. chinesne population of which extent to which region grew. As a result, it was shown some the growth of the plant of 200 individuals in the 2002 digging region, 4000 individuals in the 2001 digging region and 1000 individuals in the 2000 digging region, and so on. Though it is thought that the population formed in 2000 is seed bank origin, whether the populations formed in 2001 and later the burial seed origin or formed with the seed of an existing population, it is uncertain. Then we sampled 8 populations of the species form these areas, and studied them for allelic variation at 16 enzyme loci. There was no significant correlation between the actual population size and genetic diversity parameters, suggesting that the effective population size was very small even for the large populations. However, population that restored at the riverbed and population that approved on the embankment were able to distinguish obviously in the populations that had been approved in 2002. As for the population approved to the embankment, it was shown that genetic variation was very high in the population approved to the riverbed thought it was hardly admitted.

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Tetrasomic inheritance and isozyme variation in Turnera ulmifolia vars. elegans Urb. and intermedia Urb. (Turneraceae)

Cited by 40 publications

References 26 publications

Natural Pathways to Polyploidy in Plants and Consequences for Genome Reorganization

Natural Pathways to Polyploidy in Plants and Consequences for Genome Reorganization

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

Genetic Diversity of Restored Endangered Species, Penthorum Chinense in the Riverbed

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