Allopolyploid vs. autopolyploid origins in the genus Lathyrus (Leguminosae)

Gutiérrez, Jorge; Vaquero, F.; Vences, F. J.

doi:10.1038/hdy.1994.95

Cited by 14 publications

(11 citation statements)

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“…Although polyploidy is considered as one of the main mechanisms of evolution and diversification in plants (Soltis and Soltis 1999), it is a rare phenomenon in the genus Lathyrus (Senn 1938;Yamamoto et al 1984;Gutiérrez et al 1994). The finding of triploid and tetraploid individuals in L. nervosus constitutes the first report of polyploidy for the section Notolathyrus, whereas the existence of uneven polyploidy and a mixed population with three different cytotypes are novelties for the genus.…”

Section: Autopolyploidy In the Section Notolathyrusmentioning

confidence: 96%

“…The extensive similarity observed in the chromosome morphology, the banding pattern and the mapping of rDNA loci between the additional complements of the polyploid individuals and those of the diploid ones belonging to the same population strongly suggests that 3x and 4x cytotypes may have originated by autopolyploidy. Although interpopulation cytotype polymorphisms in L. palustris and L. pratensis were considered as cases of autopolyploidy (Gutiérrez et al 1994), and allopolyploidy has been suggested for L. venosus (Khawaja et al 1997(Khawaja et al , 1998, the mechanism by which polyploidization occurred in the genus has not been considered yet. In general, it is proposed that polyploids may be formed by somatic chromosome doubling or by sexual polyploidization (Darlington 1965;Harlan and De Wet 1975).…”

Section: Autopolyploidy In the Section Notolathyrusmentioning

confidence: 98%

“…Two other species have polyploidy but as interpopulation polymorphism. Lathyrus palustris has diploid (2n = 2x = 14) and hexaploid (2n = 6x = 42) cytotypes, whereas L. pratensis has diploid (2n = 2x = 14) and tetraploid (2n = 4x = 28) ones (Gutiérrez et al 1994). Both species grow in Eurasia and are included in sections Orobus and Pratensis, respectively.…”

Section: Introductionmentioning

confidence: 98%

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Structural karyotypic variability and polyploidy in natural populations of the South American Lathyrus nervosus Lam. (Fabaceae)

et al. 2012

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Knowledge of the chromosome variation in wild populations is essential to understand the pathways and restrictions of karyotype evolution in plants. The aim of this study is to conduct an intraspecific analysis of the karyotypes by fluorochrome banding and ribosomal DNA (rDNA) loci detection by fluorescent in situ hybridization (FISH) and of the meiotic behaviour in natural populations of Lathyrus nervosus, sect. Notolathyrus. Chromosome banding showed that, despite the high constancy in the karyotype formula and in the rDNA loci among populations, there is intraspecific variation in the amount and distribution pattern of 4',6-diamidino-2-phenylindole (DAPI ? ) heterochromatin. However, those changes were not related to the total chromosome length of the haploid complements. This fact demonstrates that structural chromosome changes may be one of the most important mechanisms for karyotype variation among natural populations of L. nervosus. The chromosome number surveyed at the population level revealed the first case of polyploidy in South American species and the first case of uneven polyploidy of the genus. All the chromosome markers analysed indicated that the polyploids found originated by autopolyploidy. The meiotic analysis showed different chromosome abnormalities that may be generating numerical and structural changes in the sporads. The finding of unreduced gametes that are alive at anthesis suggests sexual polyploidization as the most probable mechanism involved in the origin of these 3x and 4x autopolyploid cytotypes in L. nervosus.

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Section: Autopolyploidy In the Section Notolathyrusmentioning

confidence: 96%

Section: Autopolyploidy In the Section Notolathyrusmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Structural karyotypic variability and polyploidy in natural populations of the South American Lathyrus nervosus Lam. (Fabaceae)

et al. 2012

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“…Using different cytogenetics data and isozymatic analysis, GUTIERREZ et al (1994) differentiated allopolyploid and autopolyploid origin of different Lathyrus species. Different morphological and cytological parameters indicated autopolyploid origin of present tetraploid plants which can be further confi rmed by studying tetrasomic inheritance pattern of different isozyme markers in the present material as suggested by SOLTIS et al, (2007).…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic characterization of induced autotetraploids in grass pea (Lathyrus sativusL.)

Talukdar

2010

Caryologia

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-Induction of polyploidy was successfully achieved in grass pea (Lathyrus sativus L.) variety BioR-231 using 0.10% (eight hours three days), 0.20% (six hours two days and eight hours two days), 0.30% (eight hours one day) and 0.40% (six hours one day) colchicine solution by apical shoot tip treatment of young seedlings. Compared to diploid variety the tetraploid plants were morphologically distinguished by luxuriant vegetative growth showing broader and thicker leafl ets and stipules, fl attened stems, increased number of branches, enhanced length of tendril as well as peduncle, delayed fl owering and reduced pollen fertility. Number of stomata decreased but its size increased signifi cantly in tetraploids. Presence of 7II and 7-7 separation at meiosis-I were the usual feature in diploids (2n=2x=14) while occurrences of 28 chromosomes in different combinations of multivalents, bivalents and univalents at metaphase-I and unequal separation of chromosomes toward the spindle poles, bridge formation, laggard at anaphase-I distinguished tetraploid (2n=4x=28) from diploid plants, cytogenetically. All these meiotic irregularities through the formation of unbalanced gametes have been ascribed for pollen sterility and reduced seed yield in tetraploid plants. Nature of origin, morphology and formation of trivalent as well as quadrivalent indicated autopolyploid nature of present tetraploids in grass pea. Occurrence of majority pairing as bivalents has also been discussed.

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“…Distinguishing between an auto-and allopolyploid origin of a polyploid lineage has hitherto required detailed cytogenetic analysis. Such work included the extraction and staining of metaphasic chromosomes in order to characterize chromosomal configurations, such as the telomeric heterochromatin in the long arm (Tymowska and Fischberg 1982;Chalup et al 2012), and cluster analysis to test whether each of the homeologous chromosomes group together as expected under autopolyploidy (Gutiérrez et al 1994). Despite improvements in the acquisition of molecular markers, the rational beyond this test has more or less remained unchanged, with auto-versus allopolyploid origins still distinguished by testing for the occurrence of divergent chromosomes within the same tetraploid cytotype, even where data from parental species are not available (Mráz et al 2012).…”

Section: Distinguishing Between Allo-and Autopolyploidisationmentioning

confidence: 99%

Investigating speciation in face of polyploidization: what can we learn from approximate Bayesian computation approach?

Roux

Pannell

2014

Preprint

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Despite its importance in the diversification of many eucaryote clades, particularly plants, detailed genomic analysis of polyploid species is still in its infancy, with published analysis of only a handful of model species to date. Fundamental questions concerning the origin of polyploid lineages (e.g., auto-vs. allopolyploidy) and the extent to which polyploid genomes display disomic vs. polysomic vs. heterosomic inheritance are poorly resolved for most polyploids, not least because they have hitherto required detailed karyotypic analysis or the analysis of allele segregation at multiple loci in pedigrees or artificial crosses, which are often not practical for non-model species. However, the increasing availability of sequence data for non-model species now presents an opportunity to apply established approaches for the evolutionary analysis of genomic data to polyploid species complexes. Here, we ask whether approximate Bayesian computation (ABC), applied to sequence data produced by next-generation sequencing technologies from polyploid taxa, allows correct inference of the evolutionary and demographic history of polyploid lineages and their close relatives. We use simulations to investigate how the number of sampled individuals, the number of surveyed loci and their length affect the accuracy and precision of evolutionary and demographic inferences by ABC, including the mode of polyploidisation, mode of inheritance of polyploid taxa, the relative timing of genome duplication and speciation, and effective populations sizes of contributing lineages. We also apply the ABC framework we develop to sequence data from diploid and polyploidy species of the plant genus Capsella, for which we infer an allopolyploid origin for tetra C. bursa-pastoris ≈ 90,000 years ago. In general, our results indicate that ABC is a promising and powerful method for uncovering the origin and subsequent evolution of polyploid species.

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Allopolyploid vs. autopolyploid origins in the genus Lathyrus (Leguminosae)

Cited by 14 publications

References 10 publications

Structural karyotypic variability and polyploidy in natural populations of the South American Lathyrus nervosus Lam. (Fabaceae)

Structural karyotypic variability and polyploidy in natural populations of the South American Lathyrus nervosus Lam. (Fabaceae)

Cytogenetic characterization of induced autotetraploids in grass pea (Lathyrus sativusL.)

Investigating speciation in face of polyploidization: what can we learn from approximate Bayesian computation approach?

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