title: [The functioning of the mitochondrial system and respiration at the 5th larval instar in Pieris brassicae (Lepidoptera)].
abstract: The profiles of respiratory rate, total proteins, mitochondrial proteins and mitochondrial activity have been described during the fifth instar of Pieris brassicae reared either under long-day or short-day photoperiod. There was no fundamental difference per unit of live weight between the long-day and short-day larvae. The biochemical characteristics of the larval mitochondria have been described, and the mitochondria were shown to oxidize succinate better than alpha-glycerophosphate. Two periods during the fifth instar were related to mitochondrial activity. During the first one, this specific activity was high during 50 to 60 p. 100 of the instar; it then decreased. This alteration was superimposed on changes in the hormonal balance. It is shown that the respiratory rate was not only a passive response to the energy demand, and that specific mitochondrial activity must be considered as a parameter of the development program.
mesh_terms: D000255:Adenosine Triphosphate / Q000096:biosynthesis; D000818:Animals; D005994:Glycerophosphates / Q000378:metabolism; D007700:Kinetics; D007814:Larva / Q000378:metabolism; D007915:Lepidoptera / Q000254:growth & development* / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism*; D010084:Oxidation-Reduction; D010085:Oxidative Phosphorylation; D010101:Oxygen Consumption; D011506:Proteins / Q000378:metabolism; D013386:Succinates / Q000378:metabolism; D019802:Succinic Acid
chemical_list: D005994:Glycerophosphates; D011506:Proteins; D013386:Succinates; D000255:Adenosine Triphosphate; C029620:alpha-glycerophosphoric acid; D019802:Succinic Acid
vernacular_title: Le fonctionnement du système mitochondrial et la respiration au 5e stade larvaire chez Pieris brassicae (Lépidoptère).