Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey

Leptysma argentina is polymorphic for a centric fusion between pairs 3 and 6 of the basic complement, for interstitial (Si) and proximal (Sp) supernumerary segments in the smallest member of the complement, and for a B-chromosome. Fusion 3/6 is associated with several effects that would lead to a dr...

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Autor principal: Colombo, Pablo Cesar
Publicado: 1989
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v62_n3_p289_Colombo
http://hdl.handle.net/20.500.12110/paper_0018067X_v62_n3_p289_Colombo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0018067X_v62_n3_p289_Colombo
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spelling paper:paper_0018067X_v62_n3_p289_Colombo2023-06-08T14:39:19Z Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey Colombo, Pablo Cesar Leptysma argentina is polymorphic for a centric fusion between pairs 3 and 6 of the basic complement, for interstitial (Si) and proximal (Sp) supernumerary segments in the smallest member of the complement, and for a B-chromosome. Fusion 3/6 is associated with several effects that would lead to a drastic reduction of recombination (Colombo 1987, 1988). Nine populations from the Argentine provinces of Buenos Aires, Entre Ríos and Santa Fe were analysed for total (T), proximal (P), interstitial (I) and distal (D) chiasma frequencies, and for the morphometrical characters tegmina length, total length, femur length, tibia length, thorax length and thorax height. There was a strong negative correlation of T, P and I frequencies, and a significant positive correlation of D, with fusion 3/6 frequency. Fusion carriers were significantly bigger than basic homozygotes, leading to highly significant correlations of all morphometrical variables with fusion frequency. The frequencies of the fusion, segment Si and the B-chromosome follow a geographical pattern. The uneven distribution of the fusion is explained by effects on several exo- and endophenotypic traits. The nonrandom distribution of the B-chromosome is attributed to differential tolerance under differing chromosomal, genetical and/or ecological environments. No significant effects were detected for segments but Si is geographically widespread, arguing against its neutrality, while the low frequency and even frequency distribution of Sp suggests maintenance by mutation. © 1989, The Genetical Society of Great Britain. Fil:Colombo, P.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1989 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v62_n3_p289_Colombo http://hdl.handle.net/20.500.12110/paper_0018067X_v62_n3_p289_Colombo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Leptysma argentina is polymorphic for a centric fusion between pairs 3 and 6 of the basic complement, for interstitial (Si) and proximal (Sp) supernumerary segments in the smallest member of the complement, and for a B-chromosome. Fusion 3/6 is associated with several effects that would lead to a drastic reduction of recombination (Colombo 1987, 1988). Nine populations from the Argentine provinces of Buenos Aires, Entre Ríos and Santa Fe were analysed for total (T), proximal (P), interstitial (I) and distal (D) chiasma frequencies, and for the morphometrical characters tegmina length, total length, femur length, tibia length, thorax length and thorax height. There was a strong negative correlation of T, P and I frequencies, and a significant positive correlation of D, with fusion 3/6 frequency. Fusion carriers were significantly bigger than basic homozygotes, leading to highly significant correlations of all morphometrical variables with fusion frequency. The frequencies of the fusion, segment Si and the B-chromosome follow a geographical pattern. The uneven distribution of the fusion is explained by effects on several exo- and endophenotypic traits. The nonrandom distribution of the B-chromosome is attributed to differential tolerance under differing chromosomal, genetical and/or ecological environments. No significant effects were detected for segments but Si is geographically widespread, arguing against its neutrality, while the low frequency and even frequency distribution of Sp suggests maintenance by mutation. © 1989, The Genetical Society of Great Britain.
author Colombo, Pablo Cesar
spellingShingle Colombo, Pablo Cesar
Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey
author_facet Colombo, Pablo Cesar
author_sort Colombo, Pablo Cesar
title Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey
title_short Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey
title_full Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey
title_fullStr Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey
title_full_unstemmed Chromosome polymorphisms affecting recombination and exophenotypic traits in Leptysma argentina (Orthoptera): A populational survey
title_sort chromosome polymorphisms affecting recombination and exophenotypic traits in leptysma argentina (orthoptera): a populational survey
publishDate 1989
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v62_n3_p289_Colombo
http://hdl.handle.net/20.500.12110/paper_0018067X_v62_n3_p289_Colombo
work_keys_str_mv AT colombopablocesar chromosomepolymorphismsaffectingrecombinationandexophenotypictraitsinleptysmaargentinaorthopteraapopulationalsurvey
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