Aphid-specific triglycerides in symbiotic and aposymbiotic Acyrthosiphon pisum
1994
Rahbe, Y. | Delobel, B. | Febvay, G. | Chantegrel, B.
The influence of Acyrthosiphon pisum's bacterial endosymbiosis on the biogenesis of the aphid peculiar triglycerides (TG) was investigated. We present a convenient way to obtain aposymbiotic aphids, extensive NMR data on the four main aphid-specific TG (1,3-di-myristoyl 2-hexanoyl, octanoyl, sorboyl or octatrienoyl glycerides) and an HPLC method to analyse these TG. The main results are: (1) aphid symbiotes are not responsible for the biosynthesis of the unusual sorbic and octatrienoic acid containing TG; (2) diet-reared aphids, although much fatter than plant-reared individuals, are not altered in their triglyceride profile, ruling out plant-specific dietary requirements for the synthesis of the odd TG; and (3) the sorbic acid containing TG, already described in cornicular secretions of aphids, was found to be strongly tissue-specific between normal fat-body and mature cornicular fat-cells (< 1% of total TG in the former, > 35% in the latter).
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