The archaeological remains of leucaena (Fabaceae) revised

Zárate, Sergio

doi:10.1007/bf02866547

Cited by 12 publications

(23 citation statements)

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“…(19). These two species are abundantly cultivated in the Tehuacán Valley today, but there is no evidence of natural populations to suggest that either species is native there (19). These records are compatible with field observations suggesting that the present-day distribution of L. esculenta is much wider than the original native range (19,24).…”

Section: Resultsmentioning

confidence: 53%

“…Archaeobotanical data from sites across S-C Mexico (19,(34)(35)(36) suggest that Leucaena seeds have provided a minor, but constant, food source in this region for the last 6,000 years and provide evidence for early cultivation and translocation. Seed remains in caves in Tamaulipas and Oaxaca, and the earlier remains from Tehuacán, correspond to L. pulverulenta, L. trichandra, and L. pueblana, ¶ respectively (19) that grow naturally, but not in cultivation, in the vicinity of these caves today, suggesting that these resulted from archaic foraging in free-living populations (35,36).…”

Section: Resultsmentioning

confidence: 99%

“…The first appearance of seeds and pod fragments of L. esculenta from Ϸ3,200 B.P. in the Coxcatlán and Purrón caves has been interpreted as marking the start of cultivation of Leucaena in the Tehuacán Valley (19). Seeds of L. leucocephala, the most widely cultivated species today, were first identified in the Coxcatlán and Purrón sequences between 2,300 B.P.…”

Section: Resultsmentioning

confidence: 99%

“…and 1,200 B.P. (19). These two species are abundantly cultivated in the Tehuacán Valley today, but there is no evidence of natural populations to suggest that either species is native there (19).…”

Section: Resultsmentioning

confidence: 99%

“…Among these is a set of important polyploid crops in the genera Agave, Opuntia, and Leucaena for which there is preliminary evidence to suggest that hybridization between species in cultivation may have been important in driving domestication (2,17,18). For all three genera, archaeobotanical data provide evidence of use over the last 6,000-9,000 years (17,19,20); utilization involves more than one, and sometimes numerous, species in any one area; for each there are finely differentiated cognitive systems indicative of sophisticated comparative knowledge of species traits (21-23); present-day use suggests that each genus presents a complex mosaic of wild, managed, and cultivated backyard populations often involving species in sympatry; and finally, hybridization and polyploidy are frequent in all three genera.…”

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confidence: 99%

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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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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

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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Genetics of Wild and Managed Populations of Leucaena esculenta Subsp. esculenta (Fabaceae; Mimosoideae) in La Montaña of Guerrero, Mexico

Zárate

Pérez-Nasser

Casas

2005

Genet Resour Crop Evol

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Genetic consequences of silvicultural management of Leucaena esculenta subsp. esculenta were analyzed from eight allozyme loci in half-sib families of one wild and one managed in situ (selectively cleared) population from La Montaña de Guerrero region, Central Mexico. A reference sample (including wild, feral and cultivated individual plants) from the states of Morelos, Puebla and Guerrero, Mexico was also analyzed. Genetic variation, population structure and mating system were analyzed. All loci showed high variation (75-87.5% polymorphic loci at 95% level; 2.4-2.8 mean number of alleles per locus). All progenies showed heterozygous deficiency, but both wild and managed parental inbreeding coefficients were negative, suggesting heterosis. Progenies of managed populations differed from those of the wild and reference samples (Nei's unbiased identities 0.874-0.934). Biparental inbreeding is suggested by Wright's-statistics ( f ¼ 0.313), and by outcrossing rate estimates: t m ¼ 0.644 (SE 0.094), and 0.645 (SE 0.193); t s ¼ 0.576 (SE 0.189), and 0.523 (SE 0.182), for managed and wild samples respectively. Population differentiation is significant (Â ¼ 0.210). The species is self-incompatible and deviations from the mixed mating model were found. Indirect estimates of products of effective population size (N e ) by the proportion of migrants (N m ) were moderate, as were the N e values. Variation due to ecotypic differentiation (related to altitude), prolonged artificial selection, and introduction from other areas is supported. A model of domestication of seed-propagated trees is suggested, based on extensive and in situ selection of locally adapted populations, and their diffusion to other areas.

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Management, phenotypic patterns and domestication of Polaskia chichipe (Cactaceae) in the Tehuacán Valley, Central Mexico

Carmona

Casas

2005

Journal of Arid Environments

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The archaeological remains of leucaena (Fabaceae) revised

Cited by 12 publications

References 12 publications

Serendipitous backyard hybridization and the origin of crops

Serendipitous backyard hybridization and the origin of crops

Genetics of Wild and Managed Populations of Leucaena esculenta Subsp. esculenta (Fabaceae; Mimosoideae) in La Montaña of Guerrero, Mexico

Management, phenotypic patterns and domestication of Polaskia chichipe (Cactaceae) in the Tehuacán Valley, Central Mexico

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