Journal
PHYSIOLOGICAL ENTOMOLOGY
Volume 26, Issue 3, Pages 225-228Publisher
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.0307-6962.2001.00238.x
Keywords
amino acid; aphid; Aphis fabae; glutamic acid; haemolymph; metabolism; respiration; symbiosis
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The fate of radioactively labelled amino acids injected into the haemolymph of the aphid Aphis fabae was investigated. Radioactivity from each of L-[U-C-14]-glutamic acid, L- [U-C-14] -serine and L- [U-C-14]-threonine in the aphid tissues declined exponentially, at rates of 32, 9.3 and 1.0 pmol/aphid/min, respectively. For C-14-glutamic acid, radioactivity lost from the aphids was recovered quantitatively as carbon dioxide, and radioactivity in aphid saliva and honeydew was undetectable. When expressed on a per unit aphid biomass basis, the rate of respiratory loss of glutamic acid from aphids reared on chemically-defined diets was more than double that of aphids reared on the host plant, Vicia faba. It is concluded that respiration is a quantitatively important component to the aphid metabolism of glutamic acid and other amino acids.
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