Taxonomic and evolutionary implications of intraspecific variability in chromosome numbers of species of Leucaena Benth. (Leguminosae)

Cardoso, Milena Barcelos; Schifino-Wittmann, María Teresa; Bodanese‐Zanettini, Maria Helena

doi:10.1111/j.1095-8339.2000.tb00550.x

Cited by 14 publications

(17 citation statements)

References 13 publications

(11 reference statements)

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“…There is clear evidence to suggest that interspecific hybridization has been important in Leucaena. Five tetraploid species have been documented (25), and there is preliminary evidence that two of these, L. leucocephala and L. confertiflora, are allopolyploids (26). Artificial crossing experiments have shown that crossability among species is high (27).…”

mentioning

confidence: 99%

Serendipitous backyard hybridization and the origin of crops

Hughes

Govindarajulu

Robertson

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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Backyard gardens, dump heaps, and kitchen middens are thought to have provided important venues for early crop domestication via generation of hybrids between otherwise isolated plant species. However, this process has rarely been demonstrated empirically. For the majority of polyploid crops, it remains uncertain to what extent hybridization and polyploidization preceded domestication or were precipitated by human activities. Using archaeological, ethnobotanical, geographical, and genetic data, we investigate the extent and significance of predomestication cultivation, backyard sympatry, and spontaneous hybridization for the Mimosoid legume tree Leucaena, which is used as a food crop throughout south-central Mexico. We show that predomestication cultivation was widespread, involved numerous independent transitions from the wild to cultivation, and resulted in extensive artificial sympatry of 2-6 species locally and 13 species in total. Using chloroplast and rapidly evolving nuclear-encoded DNA sequences, we demonstrate that hybridization in Leucaena has been extensive and complex, spawning a diverse set of novel hybrids as a result of juxtaposition of species in cultivation. The scale and complexity of hybridization in Leucaena is significantly greater than that documented for any other Mexican plant domesticates so far. However, there are striking parallels between Leucaena and the other major Mexican perennial domesticates Agave and Opuntia, which show very similar domestication via backyard hybridization pathways. Our results suggest that backyard hybridization has played a central role in Mesoamerican crop domestication and demonstrate that the simple step of bringing species together in cultivation can provide a potent trigger for domestication.domestication ͉ Leguminosae ͉ Leucaena ͉ Mesoamerica

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mentioning

confidence: 99%

Serendipitous backyard hybridization and the origin of crops

Hughes

Govindarajulu

Robertson

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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“…(2n = 26, 52) and in I. cayennensis (2n = 26, 104) (from neighboring forest fragments) suggest that polyploidy is the main mechanism of karyotypic evolution in the genus Inga. In this genus, as well as in several others from the tribes Ingeae (Atchison, 1951;Turner and Fearing, 1960), Acacieae (Oballa and Olng'Otie, 1993), and Mimoseae (Cardoso et al, 2000;Schiffino-Withman, 2004), chromosome numbers that are multiples of 13 are more frequent -with the notable exception of the genus Calliandra, which has x = 8 (Atchison, 1948;Arce, 1992). Interestingly, in I. cayenensis, the diploid cytotype showed interphase nuclei distinct from octaploid, suggesting that structural changes occurred in the latter.…”

Section: Discussionmentioning

confidence: 63%

“…Intraspecific polyploidy is a relatively rare phenomenon in Leguminosae-Mimosoideae, having been reported for some populations of Leucaena palida and L. tricandra of the tribe Mimoseae (Cardoso et al, 2000;Schifino-Wittmann, 2004), for Vachelia farnesiana of the tribe Acacieae, and for Mimosa setosa var. paludosa (Dahmer et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Intraspecific and interspecific polyploidy of Brazilian species of the genus Inga (Leguminosae: Mimosoideae)

Figueiredo¹,

Bruno²,

Silva³

et al. 2014

Genet. Mol. Res.

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ABSTRACT. We investigated the karyotypes of 13 species of six sections of the genus Inga (Leguminosae-Mimosoideae) from Brazil. We used conventional Giemsa staining to identify numerical chromosomal variations and looked for karyotypic evolutionary patterns. The karyotypes generally had small chromosomes, varying from metacentric to submetacentric, with a basic number x = 13. Nine of the species showed 2n = 2x = 26 (I. thibaudiana, I. cayennensis, I. ingoides, I. edulis, I. vera, I. subnuda, I. striata, I. bollandii, and Inga sp), while 2n = 4x = 52 was seen in a population of Inga cylindrical and of I. capitata, and in five populations of I. laurina. Additionally, 2n = 8x = 104 was observed in a population of I. cayennensis. Eight of these counts were new, while the counts of 2n = 52 for I. laurina and 2n = 26 for I. marginata, I. vera, I. subnuda, and I. edulis confirmed previous studies. We did not find cytological stability among the sections studied, with occurrence of significant intra-and inter-specific numerical variations. We conclude that polyploidy has played a significant role in karyotypic evolution in this group and that it occurred independently in several sections of the genus.

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“…Chromosome base numbers x = 6, 7, 8,9,10,11,13,15 and 16 are reported for species of the genus ( Figure 5). Hughes (1998) and Cardoso et al (2000), in their studies on the genus Leucaena, reported that the presence of different chromosome base numbers in a given taxon is related to the taxonomic differences within it and reflects the complexity of evolutionary patterns in the diploid and tetraploid races (Abou-El-Enain 2002).…”

Section: Variations Of the Chromosome Number And Ploidy Level In Genumentioning

confidence: 99%

Chromosome number evolution, biogeography and phylogenetic relationships inSalvia(Lamiaceae)

Ranjbar

Pakatchi

Babataheri

2015

Webbia

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Taxonomic and evolutionary implications of intraspecific variability in chromosome numbers of species of Leucaena Benth. (Leguminosae)

Cited by 14 publications

References 13 publications

Serendipitous backyard hybridization and the origin of crops

Serendipitous backyard hybridization and the origin of crops

Intraspecific and interspecific polyploidy of Brazilian species of the genus Inga (Leguminosae: Mimosoideae)

Chromosome number evolution, biogeography and phylogenetic relationships inSalvia(Lamiaceae)

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