Nucleolar competition analysis in Aegilops ventricosa and its amphiploids with tetraploid wheats and diploid rye by the silver-staining procedure

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Abstract
The nucleolar organizer activity of A. ventricosa and its amphiploids with tetraploid wheats (Triticum turgidum, T. dicoccum and T. aethiopicum) and diploid rye (Secale cereale) was analyzed by the silver-staining procedure. T. turgidum and T. dicoccoides show 4 Ag-NOR (silver-stained nucleolar organizer regions), in agreement with previous data. Only 2 Ag-NOR are detected in A. ventricosa (genome constitution DDMM) indicating that natural amphiplasty occurs in this allotetraploid species. No amphiplasty was observed in the A. ventricosa-tetraploid wheat amphiploids since 6 Ag-NOR were visible in all of them. On the contrary, only 2 Ag-NOR were detected in the A. ventricosa-Secale cereale amphiploid, the rye NOR being suppressed by the presence of ventricosa chromosomes. The ventricosa NOR therefore are codominant with those of tetraploid wheat (chromosomes 1B and 6B) and dominant to chromosome 1R of rye. Eleven T. aestivum-A. ventricosa addition lines were also analyzed. All of them showed 4 Ag-NOR. Clear-cut conclusions were not reached since the added ventricosa chromosomes were not identified.

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