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Showing papers on "Uroleucon published in 1997"

Journal Article•DOI•
Endosymbionts ( Buchnera ) of the Aphid Uroleucon sonchi Contain Plasmids with trpEG and Remnants of trpE Pseudogenes

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Linda Baumann1, Marta A. Clark1, Dadbeh Rouhbakhsh1, Paul Baumann1, Nancy A. Moran2, David J. Voegtlin3 •
University of California, Davis1, University of Arizona2, Illinois Natural History Survey3
01 Jul 1997-Current Microbiology
TL;DR: Phylogenetic trees based on trpE (plasmid gene) and trpB (chromosomal genes) from eight species of aphids are congruent, indicating a lack of exchange of plasmids among endosymbionts from different aphid species.
Abstract: The aphid Uroleucon sonchi contains a prokaryotic endosymbiont (Buchnera) with plasmids having trpEG as well as remnants of trpE pseudogenes. In this respect it resembles Buchnera from the aphid Diuraphis noxia. Phylogenetic trees based on trpE (plasmid gene) and trpB (chromosomal genes) from eight species of aphids are congruent, indicating a lack of exchange of plasmids among endosymbionts from different aphid species.

38 citations

Journal Article•DOI•
Evolution of the Tryptophan Biosynthetic Pathway inBuchnera(Aphid Endosymbionts): Studies of Plasmid-AssociatedtrpEGwithin the GenusUroleucon

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Dadbeh Rouhbakhsh1, Marta A. Clark1, Linda Baumann1, Nancy A. Moran2, Paul Baumann1 •
University of California, Davis1, University of Arizona2
01 Oct 1997-Molecular Phylogenetics and Evolution
TL;DR: Nonsynonymous rates for trpEG are accelerated within Buchnera of Uroleucon, indicating a change in selection intensity within this genus, and Synonymous substitutions are about twice as high for plasmid-borne genes as for chromosomal genes in the same lineages, suggesting higher mutation rates for genes on plasmids.

33 citations

Dissertation•
SCREENING FOR APHID (Uroleucon comoositae Theobald) RESISTANCE IN SAFFLOWER(Carthamus tinctorius L. )AND MANAGEMENT OF THE PEST.

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G.Y. Parlekar
01 Jan 1997
TL;DR: A candidate for the degree of doctor of PHILOSOPHY (AGRICULTURE) AGRICULTURAL ENTOMOLOGY ZONAL RESEARCH STATION and resistance in SAFFLOWER and management of the pest.
Abstract: SCREENING FOR APHID (Uroleucon comoositae Theobald) RESISTANCE IN SAFFLOWER(Carthamus tinctorius L. )AND MANAGEMENT OF THE PEST. BY GOVINDRAO YESHWANT PARLEKAR A candidate for the degree of DOCTOR OF PHILOSOPHY (AGRICULTURE) AGRICULTURAL ENTOMOLOGY ZONAL RESEARCH STATION, SOLAPUR MAHATMA PHULE KRISHI VIDYAPEETH, RAHURI-413 722 DIST: AHMEDNAGAR

6 citations