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Article overview
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The Genomic Signature of Crop-Wild Introgression in Maize | Matthew B. Hufford
; Pesach Lubinksy
; Tanja Pyhäjärvi
; Michael T. Devengenzo
; Norman C. Ellstrand
; Jeffrey Ross Ibarra
; | Date: |
19 Aug 2012 | Abstract: | The evolutionary significance of hybridization and introgression has long
been appreciated, but evaluation of the genome-wide effects of these phenomena
has only recently become possible. Crop-wild study systems represent ideal
opportunities to examine evolution through hybridization. For example, maize
and the conspecific wild teosinte Zea mays ssp. mexicana are known to hybridize
in the fields of highland Mexico. Despite widespread evidence of gene flow,
maize and mexicana maintain distinct morphologies and have done so in sympatry
for thousands of years. Neither the genomic extent nor the evolutionary
importance of introgression between these taxa is understood. We assessed
patterns of genome-wide introgression based on 39,029 single nucleotide
polymorphisms genotyped in 189 individuals from nine sympatric maize-mexicana
populations and reference allopatric populations. While portions of these
genomes were particularly resistant to introgression (notably near known
cross-incompatibility and domestication loci), we detected widespread evidence
for introgression in both directions of gene flow. Through further
characterization of these regions and a growth chamber experiment we found
evidence consistent with the incorporation of adaptive mexicana alleles into
maize during its expansion to the highlands of central Mexico. In contrast,
very little evidence was found indicating introgression from maize to mexicana
altered the niche of this wild taxon, increasing its capacity to persist
commensal to agriculture. The methods we have applied here can be replicated
widely across species, greatly informing our understanding of evolution through
introgressive hybridization. Crop species, due to their exceptional genomic
resources and frequent histories of diffusion into sympatry with relatives,
should be particularly influential in these studies. | Source: | arXiv, 1208.3894 | Services: | Forum | Review | PDF | Favorites |
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