Abstract:
:The combination of large-scale population genomic analyses and trait-based mapping approaches has the potential to provide novel insights into the evolutionary history and genome organization of crop plants. Here, we describe the detailed genotypic and phenotypic analysis of a sunflower (Helianthus annuus L.) association mapping population that captures nearly 90% of the allelic diversity present within the cultivated sunflower germplasm collection. We used these data to characterize overall patterns of genomic diversity and to perform association analyses on plant architecture (i.e., branching) and flowering time, successfully identifying numerous associations underlying these agronomically and evolutionarily important traits. Overall, we found variable levels of linkage disequilibrium (LD) across the genome. In general, islands of elevated LD correspond to genomic regions underlying traits that are known to have been targeted by selection during the evolution of cultivated sunflower. In many cases, these regions also showed significantly elevated levels of differentiation between the two major sunflower breeding groups, consistent with the occurrence of divergence due to strong selection. One of these regions, which harbors a major branching locus, spans a surprisingly long genetic interval (ca. 25 cM), indicating the occurrence of an extended selective sweep in an otherwise recombinogenic interval.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Mandel JR,Nambeesan S,Bowers JE,Marek LF,Ebert D,Rieseberg LH,Knapp SJ,Burke JMdoi
10.1371/journal.pgen.1003378subject
Has Abstractpub_date
2013-03-01 00:00:00pages
e1003378issue
3eissn
1553-7390issn
1553-7404pii
PGENETICS-D-12-01937journal_volume
9pub_type
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