Maize Adaptation to Temperate Climate: Relationship Between Population Structure and Polymorphism in the Dwarf8 Gene

To investigate the genetic basis of maize adaptation to temperate climate, collections of 375 inbred lines and 275 landraces, representative of American and European diversity, were evaluated for flowering time under short- and long-day conditions. The inbred line collection was genotyped for 55 gen...

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Bibliographic Details
Published in:Genetics (Austin) 2006-04, Vol.172 (4), p.2449-2463
Main Authors: Camus-Kulandaivelu, Letizia, Veyrieras, Jean-Baptiste, Madur, Delphine, Combes, Valerie, Fourmann, Marie, Barraud, Stephanie, Dubreuil, Pierre, Gouesnard, Brigitte, Manicacci, Domenica, Charcosset, Alain
Format: Article
Language:English
Subjects:
Adaptation
Alleles
Climate
Corn
Gene Deletion
Genes
Genes, Plant
Genetic Variation
Genetics
Genetics, Population
Genome, Plant
Genotype
Geography
Investigations
Life Sciences
Plant Proteins - genetics
Polymorphism, Genetic
Repetitive Sequences, Nucleic Acid
Studies
Time Factors
Zea mays
Zea mays - genetics
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Summary:To investigate the genetic basis of maize adaptation to temperate climate, collections of 375 inbred lines and 275 landraces, representative of American and European diversity, were evaluated for flowering time under short- and long-day conditions. The inbred line collection was genotyped for 55 genomewide simple sequence repeat (SSR) markers. Comparison of inbred line population structure with that of landraces, as determined with 24 SSR loci, underlined strong effects of both historical and modern selection on population structure and a clear relationship with geographical origins. The late tropical groups and the early "Northern Flint" group from the northern United States and northern Europe exhibited different flowering times. Both collections were genotyped for a 6-bp insertion/deletion in the Dwarf8 (D8idp) gene, previously reported to be potentially involved in flowering time variation in a 102 American inbred panel. Among-group D8idp differentiation was much higher than that for any SSR marker, suggesting diversifying selection. Correcting for population structure, D8idp was associated with flowering time under long-day conditions, the deletion allele showing an average earlier flowering of 29 degree days for inbreds and 145 degree days for landraces. Additionally, the deletion allele occurred at a high frequency (>80%) in Northern Flint while being almost absent (
ISSN:0016-6731
1943-2631
1943-2631
DOI:10.1534/genetics.105.048603