Abstract
Microsporogenesis of Allium flavum was investigated by light microscopy using a silver impregnation technique. Ag-positive structures were present at the nucleolus organizing regions (NORs) in all stages of the meiotic cycle. During prophase I the nucleoli were found to be composed of a strongly impregnated central and a weakly impregnated peripheral component, probably corresponding to the pars fibrosa and pars granulosa, respectively. A heteromorphism with regard to the presence of a NOR allowed the determination of the crossing-over frequency in the chromosome arm concerned.
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Schedule a callMore From: Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie
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