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Zea mays (maize) genome view
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     Lineage: Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta; Spermatophyta; Magnoliophyta; Liliopsida; Poales; Poaceae; PACMAD clade; Panicoideae; Andropogoneae; Zea; Zea mays

The maize nuclear genome is thought to be amphidiploid - a fusion of two diploid genomes (Helentjaris T, Weber D, Wright S. Genetics 1988 118:185-188) - or allopolyploid - (Wilson et al. 1999) with knob heterochromatin. The knob heterochromatin has been characterized as a duplication of a 185-bp element (Peacock WJ et al. 1981) and a 350-bp element (Ananiev EV et al. 1998) with the amount of duplication varying up to 3 to 4 orders of magnitude between different races of corn. This leads to a wide range of genome sizes among corn. The minimum size is estimated to be 2400 Mbp with a high proportion of repetitive DNA. At a NSF sponsored workshop it was decided that sequencing maize genes and placing them on a cross-referenced physical-genetic map is important to improving the agronomic characteristics of the plant. The effort to deterimine the nucleotide sequence of the Zea mays subspecies mays (maize) has begun.

Currently there are seven genetic maps available. The data for six maps were provided by MaizeDB. The data are currently available from MaizeGDB. These six are 1) the IBM interim genetic map of 2000, 2) version 2 of the IBM genetic map from 2002, 3) the Emerson genetic map, 1935, and the 4) UMC-98 map with the two maps with map coordinates dependent upon the UMC-98 map, 5) QTL map and 6) bin-mapped loci. Gardiner J et al. (1993) described the UMC-98 map and the use of loci on the map to create a framework to localize non-Mendelian loci or incompletely positioned Mendelian loci. The IBM map was presented in Sharpova N et al. (2001). The initial data for the 1999 Wilson maize map [Wilson WA et al. (1999)] was provided by RiceGenes with input from MaizeDB/MaizeGDB used to complete the display. As data for other maps are requested or new map data are made available, these maps will be displayed.

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Last modified: May 20 2009

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