Characterization of introgression from the teosinte Zea mays ssp. mexicana to Mexican highland maize.

Abstract:

Background:The spread of maize cultivation to the highlands of central Mexico was accompanied by substantial introgression from the endemic wild teosinte Zea mays ssp. mexicana, prompting the hypothesis that the transfer of beneficial variation facilitated local adaptation. Methods:We used whole-genome sequence data to map regions of Zea mays ssp. mexicana introgression in three Mexican highland maize individuals. We generated a genetic linkage map and performed Quantitative Trait Locus mapping in an F2 population derived from a cross between lowland and highland maize individuals. Results:Introgression regions ranged in size from several hundred base pairs to Megabase-scale events. Gene density within introgression regions was comparable to the genome as a whole, and over 1,000 annotated genes were located within introgression events. Quantitative Trait Locus mapping identified a small number of loci linked to traits characteristic of Mexican highland maize. Discussion:Although there was no strong evidence to associate quantitative trait loci with regions of introgression, we nonetheless identified many Mexican highland alleles of introgressed origin that carry potentially functional sequence variants. The impact of introgression on stress tolerance and yield in the highland environment remains to be fully characterized.

journal_name

PeerJ

journal_title

PeerJ

authors

Gonzalez-Segovia E,Pérez-Limon S,Cíntora-Martínez GC,Guerrero-Zavala A,Janzen GM,Hufford MB,Ross-Ibarra J,Sawers RJH

doi

10.7717/peerj.6815

subject

Has Abstract

pub_date

2019-05-03 00:00:00

pages

e6815

issn

2167-8359

pii

6815

journal_volume

7

pub_type

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