000			02979nab a22004577a 4500
001			G79327
003			MX-TxCIM
005			20230927174245.0
008			210616s2004 xxk|||p|op||| 00| 0 eng d
022			_a0018-067X
022			_a1365-2540 (Online)
024	8		_ahttps://doi.org/10.1038/sj.hdy.6800387
040			_aMX-TxCIM
041			_aeng
072		0	_aF01
072		0	_aF63
090			_aCIS-3992
100	1		_aPressoir, G. _920334
245	1	0	_aPatterns of population structure in maize landraces from the Central Valleys of Oaxaca in Mexico
260			_aUnited Kingdom : _bNature Publishing Group, _c2004.
340			_aComputer File
500			_aPeer review
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0018-067X
520			_aAssessing 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 differentiation (Fst=0.011). Most surprisingly, there is no isolation by distance and small among-village differentiation (Fst=0.003). For an outbreeding plant such as maize, one would expect populations to fit Hardy–Weinberg equilibrium, but significant homozygote excess (Fis=0.13) was found. This homozygote excess shows remarkable interpopulation and interlocus differences. We show that this pattern is related to variation in the mean anthesis-silking interval as well as to the flowering range or heterogeneity in flowering of a given population. A short anthesis-silking interval and high level of heterogeneity in flowering precocity will favor assortative mating. This leads to a locus-dependent population substructure giving an unusual case of Wahlund effect and inbreeding while high levels of seed exchange among farmers prevent population differentiation at both village and regional levels.
546			_aText in English
591			_a0404|AL-Maize Program
592			_aFR-ENSAM 2003 PRESSOIR D r
650		7	_931721 _aAssortative mating _2AGROVOC
650		7	_93729 _aFlowering _2AGROVOC
650		7	_910497 _aInbreeding _2AGROVOC
650		7	_91173 _aMaize _2AGROVOC
650		7	_96305 _aLandraces _2AGROVOC
650		7	_98720 _aPopulation Structure _2AGROVOC
651		7	_2AGROVOC _91318 _aMexico
700	1		_aBerthaud, J. _95291
740			_a78783
740			_a79327
773	0		_tHeredity _n629736 _gv. 92, no. 2, p. 88-94 _dUnited Kingdom : Nature Publishing Group, 2004. _wG444336 _x1365-2540
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/577
942			_cJA _2ddc _n0
999			_c24697 _d24697