Central role for ATP in determining some aspects of animal and plant cell behaviour

Jones, Peter C.

doi:10.1016/0022-5193(72)90049-5

Cited by 29 publications

(3 citation statements)

References 38 publications

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“…It has been reported in chloroplasts and cytoplasm isolated from three difTerent plants that the energy charge just after the plants were exposed to light was higher than just after transfer to darkness (21). Other studies have shown that when plants were exposed to light or dark for a few hours, bolh the energy charge and the ATP content in the dark were higher than in the light (2,9). In our duckweed.…”

Section: Discussionsupporting

confidence: 41%

“…The activity of a higher plant enzyme was reported to be regulated by the energy charge (20) and the energy charge showed circadian oscillation in Chenopodium (22) and Neurospora (4). Jones (9) has suggested that a rhythmic variation in ATP content may under-lie other circadian rhythms. Furthermore, the circadian oscillation of the energy supply from the adenylate system may be the simplest system driving other circadian rhythms.…”

Section: Introductionmentioning

confidence: 99%

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Content of Adenosine Phosphate Compounds in a Long‐Day Duckweed, Lemna gibba G3, under Different Light and Nutritional Conditions

Kondo

Nakashima

1979

Physiologia Plantarum

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The levels of ATP ADP and AMP as well as the energy charge were examined in the long‐day duckweed. Lemna gibba G3, under different light and nutritional conditions. ATP and ADP content, but not AMP, decreased slightly when the plant was cultured with a medium depleted of sucrose or was exposed to continuous darkness. The energy charge was not affected either by changes in the light conditions or by the depletion of sucrose from the medium, although increase of fresh weight changed drastically under these conditions. The levels of ADP and AMP and the value of the energy charge remained nearly constant throughout a 1‐day period when the plant was exposed to short‐day, continuous light and continuous dark. ATP content decreased gradually during the light period of the short day and thereafter remained constant during the dark period. When the plant was exposed to continuous light. ATP content decreased until the 8th hour after beginning of the continuous light, only to recover rapidly to its original level during the phase coinciding with the preceding dark period of the short day. Under continuous dark conditions the ATP content remained constant throughout the day. It was concluded that the diurnal rhythm of physiological activities previously reported cannot be related to the energy charge.

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Section: Discussionsupporting

confidence: 41%

Section: Introductionmentioning

confidence: 99%

Content of Adenosine Phosphate Compounds in a Long‐Day Duckweed, Lemna gibba G3, under Different Light and Nutritional Conditions

Kondo

Nakashima

1979

Physiologia Plantarum

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“…First, the "photoperiodic indicator" measured is metabolic, rather than a change in growth or morphology. While work on circadian and other timing mechanisms in plant metabolism has not so far been related to photoperiodism in the manner described here, studies on CO2 flux in crassulacean plants (16), as well as on oscillations in energy charge (17)(18)(19) and the oxidation state of pyridine nucleotides (18,20), should provide tools for analyzing the situation. Second, an additional advantage in that analysis is the ability of a change in nitrogen source to modify the indicator pattern: CO2 output on aspartate, with a maximum dependent only on the dawn signal (Fig.…”

Section: Discussionmentioning

confidence: 99%

A metabolic indicator of photoperiodic timing.

Hillman¹

1976

Proc. Natl. Acad. Sci. U.S.A.

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Characteristics of CO2 output patterns of axenic cultures of Lemna perpusilla are being sought that would serve as biochemically definable indicators of the crucial photoperiodic events during inductive light/dark schedules, using cycles with skeleton main light periods and overall periodicities of 24 hr. As the length of the main light period is increased over the range [4][5][6][7][8][9][10] Carbon dioxide output was measured as described earlier, except that 50 ml of medium in 125-ml Erlenmeyer flasks was used instead of 100 ml in bottles (6). After 4-6 days under the conditions being tested, times of maximal and minimal output were estimated to the nearest 0.5 hr by counting the points (at 0.5-hr intervals) on the strip chart records. Maximal or minimal plateaus lasting 3 hr or less are assigned to the time of their midpoints; those lasting longer, to the time of their termination. On both nitrate and ammonium media, the maximum referred to is the second of the two daily peaks observable under schedules with main light periods shorter than about 8 hr and the only one remaining with longer light periods (6). In order to minimize temperature changes and direct light effects on CO2 flux, main light periods in all experiments were substituted by skeleton photoperiods in which 3 hr or less of darkness separated successive brief light exposures. Thus, to simulate main light periods of various lengths, 0.25-hr light exposures were given, starting at the indicated times, with hr 0.0 taken as the start-4 hr: 0, 1.75, 2.75, 3.75; 6 hr: 0, 1.75, 3.75, 5.75; 8 hr: 0, 3.25, 6.5, 7.75; and 10 hr: 0, 3.25, 6.5, 9.75. Light in all experiments was red, at an incidence in the range of 10-35 ,uW X cm2, obtained by screening cool white fluorescent tubes with Rohm and Haas Plexiglas, color red 2444 (11). No net CO2 uptake is observed at any time under these conditions, and the new fronds produced in them are yellow-white. RESULTSGrowth in all the media described is excellent. The rate of flowering is not the same in all, but experiments summarized elsewhere (12) show no effects of nitrogen source on the critical daylength, as estimated from the relative response to schedules with skeleton main light periods equivalent to 10, 12, 14, or 16 hr. A survey of CO2 output patterns entrained under the same set of conditions (12) indicated that the time between the daily maximum on N03-medium and the nearest light exposure decreases sharply with increasing daylength in the range used, as does flowering (9). Parallel results were obtained on NH4+ medium, while no feature of CO2 output on aspartate showed any apparent relation to photoperiodic response. A more rigorous test of the N03-maximum as a photoperiodic indicator thus seemed in order.501

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Membrane Models for Circadian Rhythms

Engelmann

Schrempf

1980

Photochemical and Photobiological Reviews

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Central role for ATP in determining some aspects of animal and plant cell behaviour

Cited by 29 publications

References 38 publications

Content of Adenosine Phosphate Compounds in a Long‐Day Duckweed, Lemna gibba G3, under Different Light and Nutritional Conditions

Content of Adenosine Phosphate Compounds in a Long‐Day Duckweed, Lemna gibba G3, under Different Light and Nutritional Conditions

A metabolic indicator of photoperiodic timing.

Membrane Models for Circadian Rhythms

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