An ammoniacal silver staining technique for mitotic chromosomes ofTriturus (Urodela: Salamandridae)

Structural characteristics of genome organization in amphibians: Differential staining of chromosomes and DNA structure

“…It should be noted, however, that in those species some rDNA sites are located not only at secondary constrictions, but also in other chromosome regions (Hutchinson and Pardue 1975;Ragghianti et al 1977).…”

Experimental Hybridization within the GenusTriturus(Urodela: Salamandridae). II. The Lampbrush Chromosomes of F1Species Hybrids BetweenTriturus Cristatus CarnifexandT. Vulgaris Meridionale

“…Another type of fusion concerns the distal sphere of univalent V of T. c. carnifex and the sphere of univalent VIII belonging to the same genome (Fig. 5 c) (RAGGHIANTI et al 1977). The nucleolus organizer regions are easily recognized on the lampbrush chromosomes when they carry an inserted nucleolus.…”

“…Recently, interspecific hybrids have been used as a cytogenetic system which is particularly suitable for an unambiguous comparison of different specific genomes analyzed within the same nucleus (MANCINO et al 1976(MANCINO et al , 1977 as well as for a more precise definition of the nature and extent of meiotic abnormalities affecting hybrid spermatogenesis and causing the male hybrids to be sterile (MANCINO et al 1978 ).…”