The trihybrid genome constitution of Bacillus lynceorum (Insecta Phasmatodea) and its karyotypic variations.

Abstract:

:The standard karyotype and a wide array of repatterned cytotypes from 21 demes of the double-allotriploid thelytokous Bacillus lynceorum have been analyzed by means of Giemsa, C-banding, and silver-staining techniques. The present study substantially amends the first karyotype description and also analyzes in detail the chromosomal rearrangements to trace their most likely derivation. Bacillus lynceorum cytotypes also provide a well-documented instance of an intraspecific gain of centromeric function. The contribution of three different specific haplosets is particularly evidenced from centromeric heterochromatin pattern and satellite/Ag-NOR locations. In stick insects, both hybridogenetic and parthenogenetic Bacillus hybrids, including B. lynceorum, can utilize the rDNA of all available parental haplosets, although a hierarchical role of the B. rossius genome seems to emerge. Satellite/Ag-NOR patterns, besides clearly allowing the recognition of ancestral parental genomes, also suggest a polyphyletic origin for B. lynceorum, which, to our knowledge, represents the only described karyotype of a trihybrid invertebrate.

journal_name

Genome

journal_title

Genome

authors

Manaresi S,Marescalchi O,Scali V

doi

10.1139/g93-044

subject

Has Abstract

pub_date

1993-04-01 00:00:00

pages

317-26

issue

2

eissn

0831-2796

issn

1480-3321

pii

g93-044

journal_volume

36

pub_type

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