Abstract：
:The authors sought to investigate the role of phytochromes A and B (phyA and phyB) and cryptochromes 1 and 2 (cryl and cry2) in the synchronization of the leaf position rhythm in Arabidopsis thaliana. The seedlings were transferred from white light-dark cycles to free-running conditions with or without exposure to a light treatment during the final hours of the last dark period. The phase advance caused by a far-red light treatment was absent in the phyA mutant, deficient in the fhy1 and fhy3 mutants involved in phyA signaling, and normal in the cryl and cryl cry2 mutants. The phase shift caused by blue light was normal in the cry2 mutant; reduced in the phyA, cryl, phyA cry1, and cry1 cry2 mutants; and abolished in the phyA cryl cry2 triple mutant. The phase shift caused by red light was partially retained by the phyA phyB double mutant. The authors conclude that cryl and cry2 participate as photoreceptors in the blue light input to the clock but are not required for the phyA-mediated effects on the phase of the circadian rhythm of leaf position. The signaling proteins FHY1 and FHY3 are shared by phyA-mediated photomorphogenesis and phyA input to the clock.
journal_name
J Biol Rhythmsjournal_title
Journal of biological rhythmsauthors
Yanovsky MJ,Mazzella MA,Whitelam GC,Casal JJdoi
10.1177/074873001129002213subject
Has Abstractpub_date
2001-12-01 00:00:00pages
523-30issue
6eissn
0748-7304issn
1552-4531journal_volume
16pub_type
杂志文章abstract：:Almost exclusively, photoperiodic insects respond to a given photoperiod in one of two ways: a "long-day" response or a "short-day" response. Intermediate responses occur only at a very restricted range of photoperiods (often less than 30 min) and are generally population phenomena rather than intermediate responses o...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873049300800104
更新日期：1993-04-01 00:00:00
abstract：:Little is known about the differences in the neural substrates of circadian rhythms that are responsible for the maintenance of differences between diurnal and nocturnal patterns of activity in mammals. In both groups of animals, the suprachiasmatic nucleus (SCN) functions as the principal circadian pacemaker, and sur...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873099129000713
更新日期：1999-08-01 00:00:00
abstract：:Mice homozygous for a dominant-negative allele of the Clock gene (Clock (Δ19/Δ19)) have slightly but significantly decreased male fertility. The molecular mechanism for this reduction in fertility is unknown. In the present study, we used a small hairpin RNA (shRNA) strategy to specifically knock down the Clock gene e...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730413486873
更新日期：2013-06-01 00:00:00
abstract：:Among the scientific resources that Colin Pittendrigh passed on to his colleagues after his death in 1996 were two unpublished papers. These manuscripts, developed first in the mid-1960s and continually updated and refined through the late 1970s, centered on the development and experimental exploration of a model of c...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730417716685
更新日期：2017-08-01 00:00:00
abstract：:The circadian system in higher organisms temporally orchestrates rhythmic changes in a vast number of genes and gene products in different organs. Complex interactions between these components, both within and among cells, ultimately lead to rhythmic behavior and physiology. Identifying the plethora of circadian targe...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730406294767
更新日期：2006-12-01 00:00:00
abstract：:Surgical isolation of the suprachiasmatic nuclei (SCN) within a hypothalamic island is reported to produce loss of circadian rhythmicity. The results have been interpreted to indicate that SCN efferents are necessary for the expression of circadian rhythms. It is not clear, however, whether the loss of circadian rhyth...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873049100600201
更新日期：1991-07-01 00:00:00
abstract：:Transplantation of the fetal suprachiasmatic nucleus (SCN) in arrhythmic SCN-lesioned rats can reinstate circadian drinking rhythms in 40% to 50% of the cases. In the current article, it was investigated whether the failure in the other rats could be due to the absence of a circadian rhythm in the grafted SCN, using a...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873099129000416
更新日期：1999-02-01 00:00:00
abstract：:The circadian timing system has three principal elements: the retina, the intergeniculate leaflet (IGL) of the thalamus, and the suprachiasmatic nucleus (SCN). Since the human circadian timing system cannot be studied experimentally, we have used another primate, the macaque monkey, to help provide insight into the or...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：
更新日期：1993-01-01 00:00:00
abstract：:On the southern Iberian Peninsula, the seasonal life history of the large white butterfly, Pieris brassicae, comprises 2 different photoperiodically induced developmental arrests: a hibernation diapause at photophases < 11 h and an estivation diapause at photophases > 14 h. At intermediate photophases (12 h to 13 h), ...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730404270388
更新日期：2004-12-01 00:00:00
abstract：:Threads of evidence from recent experimentation in retinal morphology, neurochemistry, electrophysiology, and visual perception point toward rhythmic ocular processes that may be integral components of circadian entrainment in mammals. Components of retinal cell biology (rod outer-segment disk shedding, inner-segment ...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：10.1177/074873049100600104
更新日期：1991-04-01 00:00:00
abstract：:A role for nitric oxide in circadian responses to light has been indicated in previous studies. To determine the specific function of NO-, the authors manipulated NO- and nitric oxide synthase (NOS) activity prior to light pulses that would normally induce phase shifts. The NOS inhibitor, L-NAME, selectively attenuate...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873049701200404
更新日期：1997-08-01 00:00:00
abstract：:In isolated slices of hypothalamus, suprachiasmatic nucleus (SCN) neurons were recorded intracellularly. Blockade of Ca++ channels increased spike duration, eliminating an early component of the afterhyperpolarization (AHP) that followed evoked spikes. The duration and reversal potential of AHPs were, however, unaffec...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873049000500106
更新日期：1990-04-01 00:00:00
abstract：:The suprachiasmatic nucleus (SCN) drives circadian rhythms in locomotion through coupled, single-cell oscillations. Global genetic deletion of the neuropeptide Vip or its receptor Vipr2 results in profound deficits in daily synchrony among SCN cells and daily rhythms in locomotor behavior and glucocorticoid secretion....
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730420932073
更新日期：2020-10-01 00:00:00
abstract：:Rhodopsin 7 ( Rh7), a new invertebrate Rhodopsin gene, was discovered in the genome of Drosophila melanogaster in 2000, but its function has remained elusive. We generated an Rh7 null mutant ( Rh70) by P element-mediated mutagenesis and found that an absence of Rh7 had significant effects on fly activity patterns duri...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730417721826
更新日期：2017-10-01 00:00:00
abstract：:The pineal organ of the lizard Anolis carolinensis acts as a transducer of photoperiodic information, since light can affect the pineal melatonin rhythm (PMR). The synthesis and secretion of melatonin may be a major mechanism whereby a circadian pacemaker within the pineal can control circadian clocks located elsewher...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873048700200303
更新日期：1987-10-01 00:00:00
abstract：:The measurement of circulating levels of brain-derived neurotrophic factor (BDNF) has been proposed to be a marker of disease and an indicator of recovery. Thus, knowing the temporal pattern and influence of potential circadian rhythms is important. Although several studies have measured BDNF at different times of day...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730417693124
更新日期：2017-02-01 00:00:00
abstract：:Reduced sensitivity to short-wavelength (blue) light with age has been shown for light-induced melatonin suppression. The current research aimed to determine if a similar age-related reduction occurs in subjective alertness, mood, and circadian phase-advancing responses. Young (n = 11, 23.0 +/- 2.9 years) and older (n...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730408328973
更新日期：2009-02-01 00:00:00
abstract：:Casein kinase 1ε (CK1ε) performs key phosphorylation reactions in the circadian clock mechanism that determine period. We show that the central clock protein PERIOD2 (PER2) not only acts as a transcriptional repressor but also inhibits the autoinactivation of CK1ε, thereby promoting CK1ε activity. Moreover, PER2 recip...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730415582127
更新日期：2015-06-01 00:00:00
abstract：:The mammalian circadian clock is known to be entrained by both a daily light-dark cycle and daily feeding cycle. However, the mechanisms of feeding-induced entrainment are not as fully understood as those of light entrainment. To elucidate the first step of entrainment of the liver clock, we identified the circadian c...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730411405958
更新日期：2011-06-01 00:00:00
abstract：:Groups of Syrian hamsters were exposed to LD cycles with twilight transitions and photoperiods simulating natural lighting conditions at the summer solstice (SS), equinox, and winter solstice (WS) at 41 degrees N and at the winter solstice at the Arctic Circle (WS 66 degrees N) but with daytime illuminance truncated a...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730404272907
更新日期：2005-04-01 00:00:00
abstract：:Siberian hamsters transferred from a long (16 h light/day [16 L]) to an intermediate (13.5 L) day length (DL) undergo testicular regression within 2 months followed approximately 2 months later by "spontaneous" testicular recrudescence. Recovery of gonadal function after prolonged exposure to intermediate DLs is thoug...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873002129002645
更新日期：2002-08-01 00:00:00
abstract：:The temporal expression pattern of the circadian clock gene period was compared between heads of the linden bug, Pyrrhocoris apterus , kept under diapause-promoting short days (SD) and diapause-preventing long days (LD) using a real-time PCR quantification. Diapause or reproduction was programmed by photoperiod during...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730407303624
更新日期：2007-08-01 00:00:00
abstract：:An understanding of the retinal mechanisms in mammalian photoentrainment will greatly facilitate optimization of the wavelength, intensity, and duration of phototherapeutic treatments designed to phase shift endogenous biological rhythms. A small population of widely dispersed retinal ganglion cells projecting to the ...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：10.1177/0748730403018003005
更新日期：2003-06-01 00:00:00
abstract：:The Drosophila clock relies on transcriptional feedback loops that generate daily oscillations of the clock gene expression at mRNA and protein levels. In the evening, the CLOCK (CLK) and CYCLE (CYC) basic helix-loop-helix (bHLH) PAS-domain transcription factors activate the expression of the period (per) and timeless...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730407313817
更新日期：2008-04-01 00:00:00
abstract：:Using quantitative autoradiography, 2-(125)I-melatonin binding was investigated throughout the light:dark cycle in the suprachiasmatic nuclei (SCN), paraventricular nuclei (PVT), and pars tuberalis (PT) of adult female Siberian hamsters kept for 10 weeks in either long or short photoperiods (LP or SP, respectively). P...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873049601100406
更新日期：1996-12-01 00:00:00
abstract：:Although pineal "synaptic" ribbons (SR) are frequently examined by means of quantitative electron microscopy, their functional significance remains unclear. The same is true for related structures--"synaptic" spherules (SPH). In the course of such studies, it has been noted that SR counts may differ from laboratory to...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873048800300103
更新日期：1988-04-01 00:00:00
abstract：:The large repertoire of circadian rhythms in diverse organisms depends on oscillating central clock genes, input pathways for entrainment, and output pathways for controlling rhythmic behaviors. Stress-activated p38 MAP Kinases (p38K), although sparsely investigated in this context, show circadian rhythmicity in mamma...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730414555183
更新日期：2014-12-01 00:00:00
abstract：:Abstract The cyanobacterial clock protein KaiC regulates the circadian cycle by exhibiting rhythms in transcription, translation, and phosphorylation. KaiC phosphorylation persists in circadian cycling even under transcription-less conditions and was reconstituted in vitro by incubating KaiC, KaiA, and KaiB. This pres...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730406291329
更新日期：2006-10-01 00:00:00
abstract：:The light preferences of fruit flies were tested by 2 different means. First, flies were allowed to choose between different illuminations, and their favorite resting, grooming, and feeding places were determined with an infrared-sensitive camera. Second, the activity levels of the animals during their main daily acti...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730407306198
更新日期：2007-10-01 00:00:00
abstract：:How the cellular elements of the SCN are synchronized to each other is not well understood. We explore circadian oscillations manifest at the level of the cell, the tissue, and the whole animal to better understand intra-SCN synchrony and master clock function of the nucleus. At each level of analysis, responses to va...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：10.1177/0748730409344800
更新日期：2009-10-01 00:00:00
