The genome organization and diversification of maize and its allied species revisited: evidences from classical and FISH-GISH cytogenetic analysis
- 1 March 2005
- journal article
- review article
- Published by S. Karger AG in Cytogenetic and Genome Research
- Vol. 109 (1-3), 259-267
- https://doi.org/10.1159/000082408
Abstract
The present review summarizes our classical and molecular cytogenetic investigations in the genus Zea. The results obtained from the meiotic behavior analysis of Zea species and hybrids, confirm the amphiploid nature of all species in the genus, with a basic number of x = 5 chromosomes. All species with 2n = 20 are diploidized allotetraploids, whereas Z. perennis (2n = 40) is an allooctoploid with four genomes somewhat divergent from one another. These analyses also revealed the existence of postzygotic reproductive isolation among Zea species. Our studies using genomic in situ hybridization (GISH) provide evidence about the evolutionary relationships among maize and its allied species, and reveal remarkable genomic divergences. Particularly, knob sequences were not completely shared between taxa previously considered to be closely related. Our data strongly suggest that the teosinte Z. mays parviglumis is not the only progenitor of cultivated maize. Introgression of Tripsacum into cultivated maize cannot be discarded.Keywords
This publication has 46 references indexed in Scilit:
- GISHGenomic in situ hybridization reveals cryptic genetic differences between maize and its putative wild progenitorZea mayssubsp.parviglumisGenome, 2004
- Increase in Multivalent Frequency in F1, Hybrids of Zea Diploperennis × Z. Perennis by Colchicine TreatmentHereditas, 2004
- Evolutionary relationships in the genus Zea: analysis of repetitive sequences used as cytological FISH and GISH markersGenetics and Molecular Biology, 2000
- Polyploidy: recurrent formation and genome evolutionTrends in Ecology & Evolution, 1999
- Genomic relationships between maize and its wild relativesGenome, 1999
- Genomic affinities of Zea luxurians, Z. diploperennis, and Z. perennis: Meiotic behavior of their F1 hybrids and genomic in situ hybridization (GISH)Genome, 1999
- Genomic in situ hybridization (GISH) of Tripsacum dactyloides and Zea mays ssp. mays with B chromosomesGenome, 1999
- Genome and chromosome disposition at somatic metaphase in a Hordeum × Psathyrostachys hybridHeredity, 1991
- The history and evolution of MaizeCritical Reviews in Plant Sciences, 1988
- Domestication of CornScience, 1964