2003
DOI: 10.1038/sj.hdy.6800387
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Patterns of population structure in maize landraces from the Central Valleys of Oaxaca in Mexico

Abstract: Assessing the impact of farmer management of maize landraces in the Central Valleys of Oaxaca, Mexico is crucial to an understanding of maize evolution, as it was first domesticated there. In this paper, we report on the impact of traditional farmer management of maize populations in this region in structuring molecular diversity and on the population dynamics of maize landraces. These populations, from a sample of local landraces cultivated by farmers in six villages, show little among-population differentiat… Show more

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Cited by 138 publications
(140 citation statements)
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“…Indeed, the isozyme results suggest that variation does not correlate with ethnolinguistic differences, although morphological selection may have little effect on unlinked biochemical traits. These findings are compatible with those of Pressoir and Berthaud (27,28) for maize landraces in the state of Oaxaca. The phenological and agronomic results from reciprocal gardens indicate that environmental adaptation may partially account for the maintenance of different populations, but a strong environmental basis for the differentiation between the two municipalities is lacking.…”
Section: Discussionsupporting
confidence: 81%
See 1 more Smart Citation
“…Indeed, the isozyme results suggest that variation does not correlate with ethnolinguistic differences, although morphological selection may have little effect on unlinked biochemical traits. These findings are compatible with those of Pressoir and Berthaud (27,28) for maize landraces in the state of Oaxaca. The phenological and agronomic results from reciprocal gardens indicate that environmental adaptation may partially account for the maintenance of different populations, but a strong environmental basis for the differentiation between the two municipalities is lacking.…”
Section: Discussionsupporting
confidence: 81%
“…Chiapan maize constitutes a distinct regional cluster, with seven races characterized by late maturity, tall plants, [23][24][25][26][27][28] leaves per plant, many tassel branches, long ears, and extreme sensitivity to photoperiod and temperature (11). Above 1,800 m of altitude and in the lands of the highland Tzeltal and Tzotzil, the two most common races are Olotón and Comiteco (Fig.…”
Section: Study Sitementioning
confidence: 99%
“…It is not always clear how distinct landraces or cultivars really are. Strong gene flow between villages has been demonstrated for maize in Mexico (Pressoir and Berthaud, 2004). Farmers often single out one character to identify a landrace, and through positive mass selection they ensure that this character is maintained, even in the presence of high gene flow between populations (e.g.…”
Section: Varietal Erosionmentioning
confidence: 99%
“…In fact, most maize alleles are very rare (frequencies <0.01), and many are found in single accessions that presumably correspond with farmer fields (1). Rather than segregated into discrete races, maize diversity may be spread continuously across thousands of populations (i.e., fields) in rural Mexico (13,14,17,18). Accounting for maize's metapopulation structure is difficult because of farmers' extensive control of crop population dynamics (11,13).…”
mentioning
confidence: 99%
“…Farmers recognize, value, and maintain unique traits in innumerable racial variants and mixtures-known as farmer varieties or landraces-exerting an influence on maize's genetic structure (12)(13)(14)17). Seed exchange presumably explains why 91% of isoenzymatic variation in maize landraces occurs within populations, whereas individual teosinte (wild Z. mays) populations remain genetically distinct (6,18). The low genetic diversity of some accessions also has been attributed to human factors-i.e., small field sizes (or few ears used for seed) for specialty varieties (1).…”
mentioning
confidence: 99%