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Titolo:
Molecular systematics of aphids and their primary endosymbionts
Autore:
Martinez-Torres, D; Buades, C; Latorre, A; Moya, A;
Indirizzi:
Univ Valencia, Inst Cavanilles Biodiversitat & Biol Evolut, Valencia 46071, Spain Univ Valencia Valencia Spain 46071 & Biol Evolut, Valencia 46071, Spain
Titolo Testata:
MOLECULAR PHYLOGENETICS AND EVOLUTION
fascicolo: 3, volume: 20, anno: 2001,
pagine: 437 - 449
SICI:
1055-7903(200109)20:3<437:MSOAAT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTHRANILATE SYNTHASE TRPEG; BUCHNERA-APHIDICOLA; MAXIMUM-LIKELIHOOD; MITOCHONDRIAL-DNA; NUCLEOTIDE SUBSTITUTIONS; LEUCINE BIOSYNTHESIS; MYCETOCYTE SYMBIOSIS; TREE TOPOLOGIES; EVOLUTION; BACTERIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Martinez-Torres, D Univ Valencia, Inst Cavanilles Biodiversitat & Biol Evolut, Apartado Correos 2085, Valencia 46071, Spain Univ Valencia Apartado Correos 2085 Valencia Spain 46071
Citazione:
D. Martinez-Torres et al., "Molecular systematics of aphids and their primary endosymbionts", MOL PHYL EV, 20(3), 2001, pp. 437-449

Abstract

Aphids constitute a monophyletic group within the order Homoptera (i.e., superfamily Aphidoidea). The Aphidoidea originated in the Jurassic about 150my ago from some aphidiform ancestor whose origin can be traced back to about 250 my ago. They exhibit a mutualistic association with intracellular bacteria (Buchnera sp.) related to Escherichia coli. Buchnera is usually considered the aphids' primary endosymbiont. The association is obligate for both partners. The 16S rDNA-based phylogeny of Buchnera from four aphid families showed complete concordance with the morphology-based phylogeny of their aphid hosts, which pointed to a single original infection in a common ancestor of aphids some 100-250 my ago followed cospeciation of aphids and Buchnera. This study concentrated on the molecular phylogeny of both th aphids and their primary endosymbionts of five aphid families including for the first time representatives of the family Lachnidae. We discuss results based on two Buchnera genes (16S rDNA and the beta subunit of the F-ATPase complex) and on one host mitochondrial gene (the subunit 6 of the F-ATPase complex). Although our data do not allow definitive evolutionary relationships to be established among the different aphid families, some traditionally accepted groupings are put into question from both bacterial and insect data. In particular, the Lachnidae and the Aphididae, which from morphological data are considered recently evolved sister groups, do not seem to be as closely related as is usually accepted. Finally, we discuss our results in thelight of the proposed parallel evolution of aphids and their endosymbionts. (C) 2001 Academic PressAphids constitute a monophyletic group within the order Homoptera (i.e., superfamily Aphidoidea). The Aphidoidea originated in the Jurassic about 150 my ago from some aphidiform ancestor whose origin can be traced back to about 250 my ago. They exhibit a mutualistic association with intracellular bacteria (Buchnera sp.) related to Escherichia coli. Buchnera is usually considered the aphids'primary endosymbiont. The association is obligate for both partners. The 16S rDNA-based phylogeny of Buchnera from four aphid families showed complete concordance with the morphology-based phylogeny of their aphid hosts, which pointed to a single original infection in a common ancestor of aphids some 100 - 250 my ago followed cospeciation of aphids and Buchnera. This study concentrated on the molecular phylogeny of both th aphids and their primary endosymbionts of five aphid families including for the first time representatives of the family Lachnidae. We discuss results based on two Buchnera genes (16S rDNA and the 13 subunit of the F-ATPase complex) and on one host mitochondrial gene (the subunit6 of the F-ATPase complex). Although our data do not allow definitive evolutionary relationships to be established among the different aphid families, some traditionally accepted groupings are put into question from both bacterial and insect data. In particular, the Lachnidae and the Aphididae, which from morphological data are considered recently evolved sister groups, do not seem to be as closely related as is usually accepted. Finally, we discuss our results in the light of the proposed parallel evolution of aphids and their endosymbionts. (C) 2001 Academic Press.

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Documento generato il 19/01/20 alle ore 00:34:53