Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility

Natural populations of Dichroplus elongatus often exhibit diverse forms of supernumerary heterochromatin. In Tafi Viejo, Tucumán (Argentina), parallel polymorphisms for extra segments on pairs M6, S9 (proximal) and S10 (distal) and a mitotically unstable B chromosome were detected. The segments prod...

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Autores principales: Loray, María Alicia, Remis, Maria Isabel, Vilardi, Juan Cesar
Publicado: 1991
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v84_n3_p155_Loray
http://hdl.handle.net/20.500.12110/paper_00166707_v84_n3_p155_Loray
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00166707_v84_n3_p155_Loray
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spelling paper:paper_00166707_v84_n3_p155_Loray2023-06-08T14:38:39Z Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility Loray, María Alicia Remis, Maria Isabel Vilardi, Juan Cesar Natural populations of Dichroplus elongatus often exhibit diverse forms of supernumerary heterochromatin. In Tafi Viejo, Tucumán (Argentina), parallel polymorphisms for extra segments on pairs M6, S9 (proximal) and S10 (distal) and a mitotically unstable B chromosome were detected. The segments produce intrachromosome effects excluding chiasmata from their neigbourhood and displacing them to regions distal to the extra heterochromatin. The individuals bearing simultaneously the B and the segment on M6 show a decrease in the frequency of interstitial chismata (Xi) while those carrying only segments on M6 or S10 have an increase of this variable when compared with standard males. The between cell variance of Xi is also higher in M6 segment carriers. B individuals present an increase of abnormal spermatid frequency which may be explained by the simultaneous occurrence of two mechanisms: 1) lagging of supernumeraries and 2) physiological effects of B's affecting the meiosis even in cells lacking them. The intra and interchromosome effects may be important for the plasticity of populations allowing recombination to explore new chromosome regions. The B polymorphism seems to be stable which points to an advantage of B carriers and/or the occurrence of accumulation mechanisms counterbalancing their negative effects on fertility. © 1991 Kluwer Academic Publishers. Fil:Loray, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Remis, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilardi, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1991 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v84_n3_p155_Loray http://hdl.handle.net/20.500.12110/paper_00166707_v84_n3_p155_Loray
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Natural populations of Dichroplus elongatus often exhibit diverse forms of supernumerary heterochromatin. In Tafi Viejo, Tucumán (Argentina), parallel polymorphisms for extra segments on pairs M6, S9 (proximal) and S10 (distal) and a mitotically unstable B chromosome were detected. The segments produce intrachromosome effects excluding chiasmata from their neigbourhood and displacing them to regions distal to the extra heterochromatin. The individuals bearing simultaneously the B and the segment on M6 show a decrease in the frequency of interstitial chismata (Xi) while those carrying only segments on M6 or S10 have an increase of this variable when compared with standard males. The between cell variance of Xi is also higher in M6 segment carriers. B individuals present an increase of abnormal spermatid frequency which may be explained by the simultaneous occurrence of two mechanisms: 1) lagging of supernumeraries and 2) physiological effects of B's affecting the meiosis even in cells lacking them. The intra and interchromosome effects may be important for the plasticity of populations allowing recombination to explore new chromosome regions. The B polymorphism seems to be stable which points to an advantage of B carriers and/or the occurrence of accumulation mechanisms counterbalancing their negative effects on fertility. © 1991 Kluwer Academic Publishers.
author Loray, María Alicia
Remis, Maria Isabel
Vilardi, Juan Cesar
spellingShingle Loray, María Alicia
Remis, Maria Isabel
Vilardi, Juan Cesar
Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
author_facet Loray, María Alicia
Remis, Maria Isabel
Vilardi, Juan Cesar
author_sort Loray, María Alicia
title Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
title_short Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
title_full Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
title_fullStr Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
title_full_unstemmed Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
title_sort parallel polymorphisms for supernumerary heterochromatin in dichroplus elongatus (orthoptera): - effects on recombination and fertility
publishDate 1991
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v84_n3_p155_Loray
http://hdl.handle.net/20.500.12110/paper_00166707_v84_n3_p155_Loray
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AT remismariaisabel parallelpolymorphismsforsupernumeraryheterochromatinindichropluselongatusorthopteraeffectsonrecombinationandfertility
AT vilardijuancesar parallelpolymorphismsforsupernumeraryheterochromatinindichropluselongatusorthopteraeffectsonrecombinationandfertility
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