The 24-h rhythm of metabolic activity of the cockroach circadian pacemaker

Lavialle, Monique; Chabanet, Claire; Dumortier, Bernard

doi:10.1016/0304-3940(89)90016-5

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…In Pieris, the optic centres are thus a locus where the level of metabolic activity is connected with the photoperiodic process. It must be pointed out that the larval optic centres are the anlagen of the adult optic lobes and that, from either surgical (Sokolove 1975;Page 1982;Chiba and Tomioka 1987) or functional experiments (Lavialle et al 1989), a circadian clock has been found in the optic lobes of some species. This supports the assumption that the optic centres could be part of the photoperiodic workshop, either as a photoreceptor or as a (part of the) clock.…”

Section: Discussionmentioning

confidence: 99%

“…It was shown that the activity of CO differs from one region of the brain to another (Wong-Riley 1976) and that staining decreases as neuronal activity lessens (Wong-Riley 1978). Recent studies demonstrated that CO staining, originally devised in vertebrates, could be applied to insect nervous tissue (Mimura 1988) and was also fitted to visualize rhythmic metabolic changes in a circadian pacemaker (Lavialle et al 1989). …”

Section: Introductionmentioning

confidence: 99%

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Metabolic correlates in the working of an insect putative photoperiodic clock

Lavialle

Dumortier

1990

J Comp Physiol A

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Analysis of the formal properties of photoperiodic systems has emphasized the importance of two discrete phases of nocturnal light sensitivity (the so-called points A and B) in a variety of taxa. This has been exemplified in the lepidopteran, Pieris brassicae, among other species, since the illumination of either of these phases in an otherwise short-day cycle (diapause inducing) gives rise to a long-day effect (development without diapause). In this species, the photoreceptor of diel cycles and the clock-counter system are very likely brain located. Using cytochrome oxidase activity as a marker of energy metabolism, a neuroanatomical base in the brain involved in long-day responses elicited by light at points A and B was investigated.Present results reveal that (i) the level of energy metabolism in the optic centres is connected with the photoperiodic process, and (ii) the two points A and B can be discriminated at a functional level.Referring to the formal models, the possible function of the optic centres, either as a photoreceptor or as a (part of the) clock, is discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metabolic correlates in the working of an insect putative photoperiodic clock

Lavialle

Dumortier

1990

J Comp Physiol A

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“…Its circadian system is well understood in terms of its anatomical organization and physiological properties (reviews, Page 1989Page , 1990. Circadian rhythms of locomotor activity (Nishiitsutsuji-Uwo and Pittendrigh 1968), retinal sensitivity to light (Wills et al 1985) and cytochrome oxidase activity (Lavialle et al 1989) have been characterized in L. maderae. Furthermore, there is convincing evidence (reviews, Page 1984Page , 1990Wills et al 1985;Colwell and Page 1989) that the expression of at least 2 of these rhythms is regulated by a pair of mutually coupled oscillators, each located in a discrete area ventrally in the lobula neuropil region of each optic lobe of the cockroach brain.…”

Section: Introductionmentioning

confidence: 98%

Circadian changes in cockroach ommatidial structure

Ferrell

Reitcheck

1993

J Comp Physiol A

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1. Morphological correlates of circadian changes in eye sensitivity to light measured electrophysiologically were sought in the cockroach, Leucophaea maderae. Cross sections of ommatidia removed at subjective midday and subjective midnight on 3 successive days from roaches held under constant darkness (DD) at 25 +/- 2 degrees C were examined using a transmission electron microscope for morphological differences related to sampling time. 2. The temporal difference in submicrovillar cisternae (SMC) area appeared to exhibit a circadian rhythm, however, the amplitude of this temporal difference measured under DD was less than that observed under LD 12:12 conditions. SMC areas characteristic at nighttime were achieved at subjective midnights but the area diminished only partially toward the daytime state on subjective middays. 3. Rhabdom area remained constant and the daily rhythm of screening pigment granules (SPG) arrangement about the rhabdom was not observed under conditions of constant darkness. 4. Results of this study indicate that a pacemaker(s) actively influences the change in the SMC toward the nighttime state, whereas, the change toward the daytime state results from a passive mechanism that possibly could be accelerated by light.

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