GrainGenes Reference Report: TAG-99-1080
Reference
TAG-99-1080
Title
On the diploidization mechanism of the genus Aegilops: meiotic behaviour of interspecific hybrids
Journal
Theoretical and Applied Genetics
Year
1999
Volume
99
Pages
1080-1086
Author
Cunado N Santos JL
Abstract
Summary: Chromosomal pairing of the three diploid hybrids Aegilops uniaristata x Ae. tauschii (ND), Ae. umbellulata x Ae. tauschii (UD) and Ae. comosa x Ae. uniaristata (MN), and a triploid hybrid Ae. cylindrica x Ae. caudata (DCC), was analyzed by electron microscopy in surface-spread-prophase-I nuclei and compared with light-microscopic observations of metaphase-I cells after C-banding and fluorescence in situ hybridization. All hybrids showed extensive synapsis and complex multivalents in which up to 14 chromosomes were involved. In the diploid hybrids most metaphase-I, chromosomal associations were between homoeologs, their frequencies being dependent on the relationship between the donor genomes. Despite the different overall bound-arm frequencies displayed by ND and MN hybrids at metaphase-I, chromosomes bearing rDNA sequences showed similar mean cell chromosomal association frequencies. In the triploid hybrid preferential associations involving C genomes were predominant. These observations are discussed in relation to the mechanism of diploidization showed by allotetraploid Aegilops species
Keyword
aegilops
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GrainGenes Reference Report: TAG-99-1080
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||