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Genetic structure and domestication of carrot ( Daucus carota subsp. sativus ) (Apiaceae)
Author(s) -
Iorizzo Massimo,
Senalik Douglas A.,
Ellison Shelby L.,
Grzebelus Dariusz,
Cavagnaro Pablo F.,
Allender Charlotte,
Brunet Johanne,
Spooner David M.,
Van Deynze Allen,
Simon Philipp W.
Publication year - 2013
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.1300055
Subject(s) - domestication , daucus carota , biology , genetic diversity , germplasm , gene pool , apiaceae , genetic structure , botany , phylogenetic tree , genetic variation , genetics , gene , population , demography , sociology
• Premise of the study: Analyses of genetic structure and phylogenetic relationships illuminate the origin and domestication of modern crops. Despite being an important worldwide vegetable, the genetic structure and domestication of carrot ( Daucus carota ) is poorly understood. We provide the first such study using a large data set of molecular markers and accessions that are widely dispersed around the world. • Methods: Sequencing data from the carrot transcriptome were used to develop 4000 single nucleotide polymorphisms (SNPs). Eighty‐four genotypes, including a geographically well‐distributed subset of wild and cultivated carrots, were genotyped using the KASPar assay. • Key results: Analysis of allelic diversity of SNP data revealed no reduction of genetic diversity in cultivated vs. wild accessions. Structure and phylogenetic analysis indicated a clear separation between wild and cultivated accessions as well as between eastern and western cultivated carrot. Among the wild carrots, those from Central Asia were genetically most similar to cultivated accessions. Furthermore, we found that wild carrots from North America were most closely related to European wild accessions. • Conclusions: Comparing the genetic diversity of wild and cultivated accessions suggested the absence of a genetic bottleneck during carrot domestication. In conjunction with historical documents, our results suggest an origin of domesticated carrot in Central Asia. Wild carrots from North America were likely introduced as weeds with European colonization. These results provide answers to long‐debated questions of carrot evolution and domestication and inform germplasm curators and breeders on genetic substructure of carrot genetic resources.