Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)

Two populations of Trimerotropis pallidipennis from Mendoza (MA) and Uspallata (UA) (Argentina), polymorphic with respect to centric shifts and B-chromosomes, were cytologically analysed. The medium-sized chromosomes from both populations were polymorphic for 7 (MA) and 5 (UA) inversions respectivel...

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Autor principal: Confalonieri, V.A.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00166707_v76_n3_p171_Confalonieri
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00166707_v76_n3_p171_Confalonieri
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spelling todo:paper_00166707_v76_n3_p171_Confalonieri2023-10-03T14:14:24Z Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae) Confalonieri, V.A. Two populations of Trimerotropis pallidipennis from Mendoza (MA) and Uspallata (UA) (Argentina), polymorphic with respect to centric shifts and B-chromosomes, were cytologically analysed. The medium-sized chromosomes from both populations were polymorphic for 7 (MA) and 5 (UA) inversions respectively. A clear tendency towards chiasma localisation was evident in both populations although they differ significantly with respect to mean frequencies of both total and interstitial chiasmata. The analysis of these frequencies in relation to the polymorphisms showed that in UA, the inversions do not affect chiasma formation while in MA, total chiasma frequency is negatively correlated in a significant fashion with the number of heteromorphic bivalents. This decrease is related, in non-B-carriers, to a significant increase of interstitial chiasmata. Therefore a redistribution of chiasmata, which could increase genetic recombination, is evident. The successful maintenance of polymorphisms in each population might depend, in part, on their effects on recombination, which could be related with the local requirements of genetic variability. © 1988 Kluwer Academic Publishers. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00166707_v76_n3_p171_Confalonieri
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Two populations of Trimerotropis pallidipennis from Mendoza (MA) and Uspallata (UA) (Argentina), polymorphic with respect to centric shifts and B-chromosomes, were cytologically analysed. The medium-sized chromosomes from both populations were polymorphic for 7 (MA) and 5 (UA) inversions respectively. A clear tendency towards chiasma localisation was evident in both populations although they differ significantly with respect to mean frequencies of both total and interstitial chiasmata. The analysis of these frequencies in relation to the polymorphisms showed that in UA, the inversions do not affect chiasma formation while in MA, total chiasma frequency is negatively correlated in a significant fashion with the number of heteromorphic bivalents. This decrease is related, in non-B-carriers, to a significant increase of interstitial chiasmata. Therefore a redistribution of chiasmata, which could increase genetic recombination, is evident. The successful maintenance of polymorphisms in each population might depend, in part, on their effects on recombination, which could be related with the local requirements of genetic variability. © 1988 Kluwer Academic Publishers.
format JOUR
author Confalonieri, V.A.
spellingShingle Confalonieri, V.A.
Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)
author_facet Confalonieri, V.A.
author_sort Confalonieri, V.A.
title Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)
title_short Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)
title_full Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)
title_fullStr Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)
title_full_unstemmed Effects of centric-shift polymorphisms on chiasma conditions in Trimerotropis pallidipennis (Oedipodinae:Acrididae)
title_sort effects of centric-shift polymorphisms on chiasma conditions in trimerotropis pallidipennis (oedipodinae:acrididae)
url http://hdl.handle.net/20.500.12110/paper_00166707_v76_n3_p171_Confalonieri
work_keys_str_mv AT confalonieriva effectsofcentricshiftpolymorphismsonchiasmaconditionsintrimerotropispallidipennisoedipodinaeacrididae
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