Impact of photoperiod and functional clock on male diapause in cryptochrome and pdf mutants in the linden bug Pyrrhocoris apterus

Kaniewska, Magdalena Maria; Chvalová, Daniela; Doležel, David

doi:10.1007/s00359-023-01647-5

Cited by 4 publications

(1 citation statement)

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“…PDF-ir small LNvs (s-LNvs) in the blow fly Protophormia terraenovae and their morphological counterpart neurons in the bean bug Riptortus pedestris are suggested involved in photoperiodic responses (Shiga and Numata, 2009;Ikeno et al 2014). pdf knockdown or knockout affects the photoperiodic responses in the brown-winged green bug Plautia stali and the linden bug Pyrrhocoris apterus Kotwica-Rolinska et al 2022;Kaniewska et al 2023). Therefore, pdfexpressing neurons and PTTH neurons are potent candidates composing neural circuitries for photoperiodic control of pupal diapause.…”

Section: Introductionmentioning

confidence: 99%

Photoperiodic plasticity of pigment-dispersing factor immunoreactive fibers projecting toward prothoracicotropic hormone neurons in flesh fly Sarcophaga similis larvae

Ohe,

Hasebe,

Hamanaka

et al. 2024

Preprint

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Larvae of the flesh fly, Sarcophaga similis exhibit photoperiodic responses to control pupal diapause. Although the external coincidence model is applicable to S. similis photoperiodic responses, it remains unknown how circadian clock system integrates day-length information. To explore the mechanisms underlying the photoperiodic control of pupal diapause, we examined the neural circuitry involving circadian clock lateral neurons (LNs) and prothoracicotropic hormone (PTTH) neurons, the latter possibly controlling the ecdysteroid production. We also examined the photoperiodic effects on LN-fiber patterns in third-instar S. similis larvae. Immunohistochemistry showed that PERIOD and a neuropeptide pigment-dispersing factor (PDF) were co-localized in four cells per hemisphere, and we named these PDF-LNs of S. similis. Single-cell polymerase chain reaction of backfilled neurons from the ring gland showed that two pairs of pars lateralis neurons with contralateral axons (PL-c neurons) expressed ptth. Double labeling with immunohistochemistry and backfills revealed that PDF-immunoreactive varicose fibers projected in the proximity of fibers from PL-c neurons. However, pdf receptor was not but glutamate-gated chloride channel was expressed in most PL-c neurons. L-glutamate but not PDF acutely inhibited the spontaneous firing activity of PL-c neurons. The number of PDF-immunoreactive varicosities of PDF-LNs in the dorsal protocerebrum was significantly higher under short-day than that under long-day conditions in a time-dependent manner. These results suggest that PDF-LNs, PTTH neurons, and glutamate signaling form a potential neural circuity for the photoperiodic control of pupal diapause and that photoperiod modifies the connectivity strength between PDF-LNs and their post- or pre-neurons in the circuitry.

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Section: Introductionmentioning

confidence: 99%

Photoperiodic plasticity of pigment-dispersing factor immunoreactive fibers projecting toward prothoracicotropic hormone neurons in flesh fly Sarcophaga similis larvae

Ohe,

Hasebe,

Hamanaka

et al. 2024

Preprint

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A clock for all seasons

Helfrich-Förster,

Rieger

2024

J Comp Physiol A

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Circadian clocks play an essential role in adapting locomotor activity as well as physiological, and metabolic rhythms of organisms to the day-night cycles on Earth during the four seasons. In addition, they can serve as a time reference for measuring day length and adapt organisms in advance to annual changes in the environment, which can be particularly pronounced at higher latitudes. The physiological responses of organisms to day length are also known as photoperiodism. This special issue of the Journal of Comparative Physiology A aims to account for diurnal and photoperiodic adaptations by presenting a collection of ten review articles, five original research articles, and three perspective pieces. The contributions include historical accounts, circadian and photoperiodic clock models, epigenetic, molecular, and neuronal mechanisms of seasonal adaptations, latitudinal differences in photoperiodic responses and studies in the wild that address the challenges of global change.

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