Abstract
To gain an understanding of the genetic basis of adaptation, we conducted quantitative trait locus (QTL) mapping for flowering time variation between two winter annual populations of Arabidopsis thaliana that are locally adapted and display distinct flowering times. QTL mapping was performed with large (n = 384) F(2) populations with and without vernalization, in order to reveal both the genetic basis of a vernalization requirement and that of variation in flowering time given vernalization. In the nonvernalization treatment, none of the Sweden parents flowered, whereas all of the Italy parents and 42% of the F(2)s flowered. We identified three QTLs for flowering without vernalization, with much of the variation being attributed to a QTL co-localizing with FLOWERING LOCUS C (FLC). In the vernalization treatment, all parents and F(2)s flowered, and six QTLs of small to moderate effect were revealed, with underlying candidate genes that are members of the vernalization pathway. We found no evidence for a role of FRIGIDA in the regulation of flowering times. These results contribute to a growing body of evidence aimed at the identification of ecologically relevant genetic variation for flowering time in Arabidopsis, and set the stage for functional studies to determine the link between flowering time loci and fitness.
MeSH Terms
Adaptation, Physiological
Arabidopsis/genetics,growth & development,physiology
Arabidopsis Proteins/genetics
Chromosome Mapping
Flowers/genetics,growth & development,physiology
Genes, Plant
Phenotype
Population Dynamics
Quantitative Trait Loci
Time Factors
Chemicals
Arabidopsis Proteins
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Grillo Michael A
Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.
Li Changbao
Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.
Hammond Mark
Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.
Wang Lijuan
Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.
Schemske Douglas W
Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.
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