Interchange quadrivalents and chromosome order at meiotic metaphase I in Briza L. (Gramineae)

The relative positioning of bivalents and (or) quadrivalents in flattened lateral views of metaphase I (linear metaphase plates) has been analyzed in three different plant types of rye: normal plants (type 1); heterozygotes for translocation T305W (type 2); and double heterozygotes for translocations T305W and TR01 (type 3). In all plant types all bivalents and (or) quadrivalents were identified using C-banding. The results indicate that quadrivalents show a preference towards being located in marginal positions of the linear plate, and there are also differences in position preferences between specific bivalents. Adjacently oriented quadrivalents and rod bivalents show a stronger preference for marginal positions than alternate quadrivalents and ring bivalents, respectively, but this does not indicate the existence of a fixed or ordered arrangement of chromosomes in the spindle since bivalents and (or) quadrivalents are independently located relative to each other.Key words: Secale, meiosis, metaphase, arrangement, multivalents, bivalents.

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Interchange quadrivalents and chromosome order at meiotic metaphase I in Briza L. (Gramineae)

Cited by 5 publications

References 19 publications

Polyploidy and Evolution in Wild and CultivatedDahliaSpecies

Polyploidy and Evolution in Wild and CultivatedDahliaSpecies

Phylogenetic analysis of the Briza Complex (Poaceae)

Independent arrangement of bivalents and (or) quadrivalents in linear meiotic metaphase plates of rye

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