Maize Adaptation to Temperate Climate: Relationship Between Population Structure and Polymorphism in the Dwarf8 Gene
- 1 April 2006
- journal article
- Published by Oxford University Press (OUP) in Genetics
- Vol. 172 (4), 2449-2463
- https://doi.org/10.1534/genetics.105.048603
Abstract
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 (Dwarf8 could be involved in maize climatic adaptation through diversifying selection for flowering time.Keywords
This publication has 36 references indexed in Scilit:
- genalex 6: genetic analysis in Excel. Population genetic software for teaching and researchMolecular Ecology Notes, 2005
- distruct: a program for the graphical display of population structureMolecular Ecology Notes, 2003
- Early Allelic Selection in Maize as Revealed by Ancient DNAScience, 2003
- Association Mapping in Structured PopulationsAmerican Journal of Human Genetics, 2000
- Simple Sequence Repeat Markers Developed from Maize Sequences Found in the GENBANK Database: Map ConstructionCrop Science, 1996
- Pedigree Diversity within the Lancaster Surecrop Heterotic Group of MaizeCrop Science, 1993
- The origin of cornbelt maize: The isozyme evidenceEconomic Botany, 1988
- Exceptional Genetic Divergence of Northern Flint CornAmerican Journal of Botany, 1986
- THE GENETICAL STRUCTURE OF POPULATIONSAnnals of Eugenics, 1949
- The Northern Flint CornsAnnals of the Missouri Botanical Garden, 1947