Segmental allopolyploidy and paleopolyploidy in species of Leucaena Benth: evidence from meiotic behaviour analysis

Boff, Tatiana; Schifino-Wittmann, María Teresa

doi:10.1034/j.1601-5223.2003.01646.x

Cited by 15 publications

(11 citation statements)

References 19 publications

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“…These authors observed that 26% of the species analyzed were polyploids and that at least 3 of them exhibited intraspecific polyploidy. A similar evolutionary pattern of polyploidy was also observed in other South America species of Mimosa (Seijo and Fernández, 2001) and Leucaena (Boff and Schifino-Wittmann, 2003). A total of 13 species of the genus Inga from northeastern Brazil were analyzed, and 4 were found to be polyploids (2 of them showing intraspecific polyploidy; Mata, 2009, unpublished data).…”

Section: Discussionmentioning

confidence: 86%

“…In Leucaena, for example, there are paleopolyploid species with 2n = 52 and 58, suggesting that there may have been 2 basic numbers-1 originating through disploidy from an ancestral stock with x 2 = 26 (Boff and Schifino-Wittmann, 2003). Genera, such as Desmanthus, Entada, and Prosopis (Table 2), have the basic number x = 14, which apparently resulted from ascending disploidy from a principal lineage with x = 13.…”

Section: Discussionmentioning

confidence: 99%

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Chromosome number variation and evolution in Neotropical Leguminoseae (Mimosoideae) from northeastern Brazil

Santos¹,

Carvalho²,

Almeida³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Most members of the subfamily Mimosoideae have pantropical distributions, variable habits, and a basic chromosome number x = 13. We examined karyotypic evolution of 27 species of this subfamily occurring principally in northeastern Brazil by examining chromosomes stained with Giemsa. All of the species had semireticulated interphase nuclei and early condensing segments in the proximal region of both chromosome arms. The basic number x = 13 was the most frequent, with 2n = 2x = 26 in 19 of the species, followed by 2n = 4x = 52 and 2n = 6x = 78. However, the three species of the genus Calliandra had the basic number x = 8, with 2n = 2x = 16, while Mimosa cordistipula had 2n = 4x = 32. The karyotypes were relatively symmetrical, although bimodality was accentuated in some species, some with one or two acrocentric pairs. As a whole, our data support earlier hypotheses that the Mimosoideae subfamily has a basic number of x = 13 and underwent karyotypic evolution by polyploidy. However, x = 13 seems to be a secondary basic number that originated from an ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 11 (3): 2451-2475 (2012 E.C.X.R. Santos et al. 2452 ancestral stock with x 1 = 7, in which polyploidy followed by descending disploidy gave rise to the current lineages with x = 13. Another lineage, including current representatives of Calliandra with x = 8, may have arisen by ascending disploidy directly from an ancestral monoploid stock with x 1 = 7.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Chromosome number variation and evolution in Neotropical Leguminoseae (Mimosoideae) from northeastern Brazil

Santos¹,

Carvalho²,

Almeida³

et al. 2012

Genet. Mol. Res.

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“…coccineus, 2n=22 (Castagnaro et al 1990); c. células somáticas en metafase de Astragalus pehuenches, 2n=22 (Dopchiz et al 1995); d. metafase de Senna chloroclada 2n=28; e. cromosomas somáticos de Vicia pampicola, 2n=14 (Naranjo et al 1998); f. metafase de Bauhinia uruguayensis, 2n=26; g. hibridación in situ de Galactia fiebrigiana, 2n=20 (Sede et al 2006); h. hibridación in situ de Collaea stenophylla, 2n=20, usando como sonda la región rDNA pTa71 (Sede et al 2006). La barra en las figuras a-f representa 10 µm y g-h 5 µm a b c d e f g h sugieren que la hibridación interespecífica y poliploidía han sido relevantes en su evolución (n=13, 26, 52,104/14, 28, 56, 112); como antecedente se indica que Leucaena presenta especies de origen híbrido homoploide y poliploide, y polimorfismo numérico para cromosomas accesorios (cromosomas B), lo cual complica los análisis convencionales de relaciones especificas tanto a nivel taxonómico como evolutivo (Hughes et al 2002;Boff & Schifino Wittman 2003). Calliandra es atípico en la tribu Ingeae, por ser el único representante genérico con 2n=16 cromosomas.…”

Section: Análisis Filogenético De La Variación Cromosómicaunclassified

Citogenética evolutiva en Leguminosas americanas

2008

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RESUMEN(Citogenética evolutiva en Leguminosas americanas) Se presentan las características cromosómicas descriptas hasta el momento en Leguminosas americanas. A través del análisis de estos datos en conjunto con los morfológicos y las filogenias moleculares se proponen hipótesis acerca de los cambios cromosómicos ocurridos durante el proceso de divergencia y especiación de la familia. Los estudios cromosómicos indican una gran variación intergenérica, inter e intraespecífica, además de una amplia diversificación en el tamaño del genoma entre géneros, especies y poblaciones. A partir del número básico ancestral x=7 se deduce que la especiación híbrida poliploide ha sido muy importante en la diversificación de la familia. Por procesos de disploidía creciente y decreciente, tanto a nivel diploide como poliploide se originarían números básicos secundarios y series poliploides modificadas. En la parafilética subfamilia Caesalpinioideae habría predominado el proceso de disploidia decreciente de n=14 a n=11. En la monofilética subfamilia Mimosoideae, ocurrió un evento principal de evolución del número cromosómico de 14 a 13. Por último en Papilionoideae, la subfamilia más derivada de Leguminosae, se observó reducción del número básico de 14 a 7, pasando por números gaméticos de 11 y 8. Por otro lado, el origen recurrente de los poliploides y la ocurrencia de rearreglos intergenómicos, hibridación y poliploidía secundaria, son procesos que dificultan la agrupación natural de los taxones en algunos grupos de la familia Leguminosae. Palabras clave: Leguminosae, citogenética, poliploidía, evolución cromosómica, hibridación, América. ABSTRACT(Evolutionary cytogenetics in Americans Legumes) Chromosomic features described so far for Americans legumes are reviewed and analyzed, simultaneously with morphological and molecular characters. This is an invaluable opportunity to propose hypotheses about chromosome changes during the family divergence and speciation processes. The chromosome studies showed wide inter-generic, inter and intra-specific variability, as well as marked differences in genome sizes between genera, species and populations. By postulating an ancestral basic number of seven (x=7) it is possible to deduce that polyploid hybrid speciation was very important in the diversification of the family as a whole. Due to increasing and decreasing diploidy processes, secondary basic numbers and modified polyploids series could have arised both at diploid and polyploid levels. On the other hand, recurrent origin of polyploids, occurrence of inter-genomic rearrangements, hybridization and secondary polyploidy are all processes that make it difficult to group the taxa within the Leguminosae family in a natural sequence.

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“…Os dados de comportamento meiótico sugerem uma origem alopoliplóide segmentar sensu STEBBINS (1971), apesar de a autopoliploidia não poder ser descartada. Até 7% (BOFF & SCHIFINO-WITTMANN, 2003) ou mesmo 12% de gametas não reduzidos podem ocorrer em L. trichandra. A identificação de um poliplóide natural em L. trichandra sugere que a autopoliploidia pode ocorrer em Leucaena.…”

Section: Comportamento Meióticounclassified