Endogenous rhythmicity and energy transduction VII. Phytochrome-modulated rhythms in pyridine nucleotide levels in seedlings of Chenopodium rubrum

Wagner, Edgar; Frosch, S.; Kempf, Olga

doi:10.1016/0304-4211(74)90130-8

Cited by 17 publications

(8 citation statements)

References 19 publications

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“…In the fungus N. crassa, the NAD þ /NADH ratio was shown to resonate with the rhythms in conidiation (Brody and Harris 1973). Similar oscillations were observed for NADP þ / NADPH in plant seedlings kept under constant conditions (Wagner and Frosch 1974). Diurnal variation in both redox couples was also observed in rodent liver (Robinson et al 1981;Kaminsky et al 1984), although these were assayed under normal feeding regimens and thus might be partially driven by food intake.…”

Section: Oscillations In the Cellular Nicotinamide Adenine Dinucleotimentioning

confidence: 62%

Cellular Timekeeping: It’s Redox o’Clock

Milev

Rhee

Reddy

2017

Cold Spring Harb Perspect Biol

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Mounting evidence in recent years supports the extensive interaction between the circadian and redox systems. The existence of such a relationship is not surprising because most organisms, be they diurnal or nocturnal, display daily oscillations in energy intake, locomotor activity, and exposure to exogenous and internally generated oxidants. The transcriptional clock controls the levels of many antioxidant proteins and redox-active cofactors, and, conversely, the cellular redox poise has been shown to feed back to the transcriptional oscillator via redox-sensitive transcription factors and enzymes. However, the circadian cycles in the -sulfinylation of the peroxiredoxin (PRDX) proteins constituted the first example of an autonomous circadian redox oscillation, which occurred independently of the transcriptional clock. Importantly, the high phylogenetic conservation of these rhythms suggests that they might predate the evolution of the transcriptional oscillator, and therefore could be a part of a primordial circadian redox/metabolic oscillator. This discovery forced the reappraisal of the dogmatic transcription-centered view of the clockwork and opened a new avenue of research. Indeed, the investigation into the links between the circadian and redox systems is still in its infancy, and many important questions remain to be addressed.

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Section: Oscillations In the Cellular Nicotinamide Adenine Dinucleotimentioning

confidence: 62%

Cellular Timekeeping: It’s Redox o’Clock

Milev

Rhee

Reddy

2017

Cold Spring Harb Perspect Biol

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“…In Chenopodium rubrum, Wagner et al (30) have shown the presence of short term oscillations in adenine nucleotide contents which together give a circadian rhythm in energy charge (ATP + 0.5 ADP/ATP + ADP + AMP) (1, 2) and a circadian rhythm in NADPH/NADP ratio (28). ADP is known to inhibit NO3R from tomato (16) and spinach leaves (5), and rhythmic changes in adenine nucleotides could be involved in the rhythms of NO3R activity.…”

Section: Discussionmentioning

confidence: 99%

Rhythmic Nitrate Reductase Activity in Leaves of Capsicum annuum L. and the Influence of Kinetin

Steer

1976

Plant Physiol.

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In the expanding leaves of Capsicum annuum L. cv. California Wonder, two of the three peaks of nitrate reductase activity associated with the light period exhibit a circadian rhythm that persists in continuous light.The spray application of kinetin to the whole shoot or to leaves other than the ones used for nitrate reductase assay causes a phase shift in the activity peaks and this has been used in preliminary investigations of the character of the mechanisms controlling the timing of the peaks.There was some indication that the rate of translocation of nitrate from the roots might be involved. The levels of nitrate moving up the stem after kinetin treatment were more dependent upon the rate of sap flow than on the concentration of nitrate in the sap. For this reason, transpiration rates in whole plants were measured after kinetin treatment but no change in pattern was seen that would correlate with the phase shift in nitrate reductase activity.The occurrence of nitrate reductase peaks in excised leaves suggested a leaf-based in addition to a root-or stem-based mechanism in the timlng of nitrate reductase activity in the leaves.In previous reports (22)(23)(24), the metabolic fate of photosynthetically fixed carbon was shown to be very closely linked in time with the activity of nitrate reductase in leaves of Capsicum annuum. Nitrate reductase exhibited three peaks of activity during and immediately after the light period and they were numbered: peak I, the peak observed soon after the end of the photoperiod that was correlated with a rise in carbon flow into amino acids during the last 2 hr of the photoperiod (22); peak II, that observed within 1 hr of the start of the photoperiod; and peak III, the major peak, observed 6 hr after the inductive lighton signal (24).The resultant periodicity in the supply of reduced nitrogen in the leaf was paralleled directly in the synthesis of amino acids from newly fixed carbon.A sequence of control mechanisms diverting carbon from the reductive pentose phosphate pathway to amino acid synthesis involved the activation of pyruvic kinase, possibly by NH4+, resulting from the activity of nitrate reductase (23). Thus, the periodic activity of leaf nitrate reductase (NO3R) seemed to play a primary role in this control sequence, and to study it further, some characteristics of two of these nitrate reductase peaks, that at the beginning of the photoperiod (peak II) and that mahifest soon after the end of the photoperiod (peak I), have been investigated. Both peaks show entrainment under constant environmental conditions and exhibit phase shifts when the plant is treated with kinetin. Some mechanisms possibly involved with the timing of nitrate reductase activity have been investigated.

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“…In analyzing the energy metabolism of sychronized and photosynthetically active seedlings of Chenopodium rubrum with respect to rhythmic changes in adenine and pyridine nucleotides, it was demonstrated that the pool sizes of all nucleotides changed rhythmically (Wagner et al, 1974d;Wagner and Frosch, 1974). The computation of the energy charge and of the ratio NADPH/ NADP revealed a circadian rhythm in continuous darkness as well as in continuous light.…”

Section: Endogenous Rhythm1city In Metabolic Activity As Related To Cmentioning

confidence: 98%

“…Mitchell, 1976; Table 2). This way one could possibly rationalize the effect of phytochrome on pyridine nucleotide levels after light pulses and under continuous irradiation Wagner et al, 1974c).…”

Section: Kinetics Of Phytochrome Action At the Light Dark Transition mentioning

confidence: 99%

“…Phytochrome modulation of pyridine mcleotide pools in Chenopodium rubrum (Wagner et al, 1974c)and transistory phytochrome control of ATP levels (Junghans and Jaffe, 1972;White and Pike, 1974;Kirshner et al, 1975) though questioned by other authors (Bürcky and Kauss, 1974) seem to support the concept that phytochrome might be primarily involved in redox changes and might modulate electron or proton flow (Table 2) (Fujii and Kondo, 1969;Tezuka and Yamamoto, 1972;Manabe andFuruya, 1973, 1974;Grepping et al, 1973;Grepping and Horwitz, 1975;Borthwick et al, 1969;Klein and Edsall, 1966;Junghans and Jaffe, 1972;Racusen and Etherton, 1975;Racusen and Satter, 1975). Phytochrome acts on a system where the interconnected pathways of energy transduction give rise to a circadian rhythm in energy transduction.…”

Section: Kinetics Of Phytochrome Action At the Light Dark Transition mentioning

confidence: 99%

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