Changes in Lipid Biosynthesis During Development of the House Cricket, Acheta domesticus (Orthoptera: Gryllidae)

Effects of developmental age, ambient temperature, and dietary alterations on ?12 desaturase activity in the house cricket,Acheta domesticus

“…Following this peak, there is a steady decline in activity. Cripps et al (1988) demonstrated a similar trend in total lipid biosynthesis from penultimate and ultimate instars, and adult crickets, suggesting concomitant increases of ∆ 12 desaturase activity with other lipogenic activities. As the instar approaches its final ecdysis, feeding ceases and the content of lipid, carbohydrate, and protein fluctuate (Woodring et al, 1977).…”

“…A third factor that affects lipid biosynthesis in general is the developmental age of the organism (Cripps et al, 1988). We found previously that levels of newly synthesized lipids increase significantly post-eclosion, then begin to decline after day 6.…”

Cuticular hydrocarbons as maternal provisions in embryos and nymphs of the cockroach Blattella germanica

“…Maternal hydrocarbons would thus offset such deficiencies and serve to protect young nymphs from excessive water loss. Moreover, only a fraction of each intermolt period is dedicated to hydrocarbon synthesis (Fig.·2B) (Cripps et al, 1988;Young and Schal, 1997) and this process is significantly constrained by both availability of food (Young et al, 1999) and cyclic cellular competency of the oenocytes to produce hydrocarbons . Interestingly, the first instar of the German cockroach is the only mobile stage that can proceed to the next molt largely independent of food intake (Kopanic et al, 2001).…”

Food intake in Blattella germanica (L.) nymphs affects hydrocarbon synthesis and its allocation in adults between epicuticle and reproduction

“…HC synthesis and the amount and type of HC on the cuticle may vary with age, with environmental conditions such as temperature, relative humidity and habitat, and with developmental stage (Blomquist et al, 1987a,b;Gibbs and Crowe, 1991;Howard, 1993;Nelson and Blomquist, 1995). In the house cricket, Acheta domesticus, the patterns of triacylglycerol, phospholipid, and HC syntheses are similar, with lipogenesis being maximal at mid-stadium and minimal at ecdysis, presumably reflecting the pattern of feeding and water intake (Cripps et al, 1988). In cabbage looper (Trichoplusia ni) larvae, the rate of HC synthesis also increases dramatically after each molt, during the feeding stages, and falls to low levels during the wandering stages (Dwyer et al, 1986).…”

“…In a number of holometabolous and hemimetabolous insects, it has been shown that after each ecdysis the amount of internal HC declines sharply, suggesting that the internal HC serve as a reservoir for the cuticle of the next developmental stage. The rate of HC synthesis increases dramatically after each molt, during the feeding stages, and falls to low levels during the wandering stages (Dwyer et al, 1986;Cripps et al, 1988;Guo and Blomquist, 1991;Young and Schal, 1997). Similarly, adult females synthesize HC in a stage-specific pattern that is related to food intake, and they transfer HC to the next generation, the oocyte, via the reproductive cycle (Schal et al, 1994(Schal et al, , 1998.…”