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Abstract
The relationship of late recombination nodules (RNs) to chiasmata and crossing-over was examined in a short defined chromosome region of Allium fistulosum. The nucleolus organising region (NOR) occupies a subterminal position on the short arm of the most acrocentric bivalent of this species and is easily recognised in surface spread pachytene synaptonemal complexes (SCs) and at metaphase I and anaphase I. Some of the plants examined had heteromorphic nucleolus organising short arms, involving deletion of the NOR from one homologue. This system allowed comparison of late RN frequency in pachytene SCs with metaphase-I chiasma frequency, and also with crossover frequency based on first division segregation of the NOR deletion. Despite general and localised deficits of late RNs compared to chiasmata and crossovers in A. fistulosum, the frequency of late RNs in this defined short region did not differ significantly from the other estimates of recombination frequency.
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