Ultrastructure and the relationship between the nucleolus and the nucleolar organizer region in Orthoptera male germ cells

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Abstract
The ultrastructure of the nucleolar organizer region, together with the relationships they maintain, are described in male germ cells of 2 spp. of grasshoppers [Oedipoda coerulescens and chorthippus bicolor]. The nucleolus is multiple and appears related to a fibrillar center which seems to represent only a nontranscribing part of the organizer region. By means of serial sections, a particular relationship among the fibrillar center the rDNA loops and the nucleolar masses is suggested.