Journal ArticleDOI
Nutritional Interactions in Insect-Microbial Symbioses: Aphids and Their Symbiotic Bacteria Buchnera
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TLDR
It is argued that strong parallels may exist between the nutritional interactions (including the underlying mechanisms) in the aphid-Buchnera association and other insect symbioses with intracellular microorganisms.Abstract:
Most aphids possess intracellular bacteria of the genus Buchnera. The bacteria are transmitted vertically via the aphid ovary, and the association is obligate for both partners: Bacteria-free aphids grow poorly and produce few or no offspring, and Buchnera are both unknown apart from aphids and apparently unculturable. The symbiosis has a nutritional basis. Specifically, bacterial provisioning of essential amino acids has been demonstrated. Nitrogen recycling, however, is not quantitatively important to the nutrition of aphid species studied, and there is strong evidence against bacterial involvement in the lipid and sterol nutrition of aphids. Buchnera have been implicated in various non-nutritional functions. Of these, just one has strong experimental support: promotion of aphid transmission of circulative viruses. It is argued that strong parallels may exist between the nutritional interactions (including the underlying mechanisms) in the aphid-Buchnera association and other insect symbioses with intracellular microorganisms.read more
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References
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Journal ArticleDOI
A molecular clock in endosymbiotic bacteria is calibrated using the insect hosts
TL;DR: Rates calibrated using dates inferred from fossil aphids imply that Asian and American species of the aphid tribe Melaphidina diverged by the early Eocene; this result confirms an earlier hypothesis based on biogeographic evidence.
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Journal ArticleDOI
Genetics, Physiology, and Evolutionary Relationships of the Genus Buchnera: Intracellular Symbionts of Aphids
TL;DR: Genetic and physiological studies indicate that Buchnera can synthesize methionine, cysteine, and tryptophan and supply these amino acids to the aphid host and involve plasmid-amplification of the gene coding for anthranilate synthase, the first enzyme of the tryptophile biosynthetic pathway.
Journal ArticleDOI
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