Electron spin resonance signals and cell structure of Chlorella pyrenoidosa grown under different light intensities

Treharne, R.W.; Melton, C.W.; Roppel, Richard M.

doi:10.1016/s0022-2836(64)80027-9

Cited by 23 publications

(3 citation statements)

References 11 publications

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“…The changes in photosynthetic pigments during photoacclimation are expected to be accompanied by parallel changes in thylakoid membranes and ultrastructure of the chloroplast (Treharne et al 1964, Prezlin 1981, Sukenik et al 1987, Sukenik et al 1989, 1990. Very few reports connected the changes in pigmentation with changes in ultrastructure.…”

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THE KINETICS OF THE PHOTOACCLIMATION RESPONSE OF NANNOCHLOROPSIS SP. (EUSTIGMATOPHYCEAE): A STUDY OF CHANGES IN ULTRASTRUCTURE AND PSU DENSITY

Fisher

Berner

Iluz

et al. 1998

Journal of Phycology

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In this study we report the kinetics of photoacclimation of the unicellular alga Nannochloropsis sp. grown under high light (HL), and subsequently transferred to low light (LL). We examined the changes in ultrastructural features, pigmentation, and photosynthetic parameters over short intervals until the LL steady state was reached. The ultrastructural changes were followed by quantitative morphometric measurements of transmission electron micrographs. We found that the increase in the relative volume of the chloroplast during acclimation to LL (twofold) was accompanied by an increase in number of stacks (twofold) and in the surface area of thylakoids per cell (2.5‐fold). The increase in photosynthetic unit (PSU) density was about 2.15‐fold. Maximal density was about 84 PSU·μm−2 in LL cells, and minimal density was 39 PSU·μm−2 in HL cells. The HL/LL ratio of the in vivo optical absorption cross‐section of PSU (σPSU) was 2.8, whereas in the in vivo optical absorption cross‐section of the cell (σcell), the trend of change was in the opposite direction: 1.7‐fold higher in LL‐acclimated cells than in HL‐acclimated cells. We propose a partial sequence of the photoacclimation processes based on our data and the derived rate constants.

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“…Some of these described visual differences between HL and LL cells , Post et al 1985. Treharne et al (1964) found that in LL-acclimated cells of Chlorella, the number and density of the thylakoids were much higher than in HL-acclimated cells.…”

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confidence: 99%

THE KINETICS OF THE PHOTOACCLIMATION RESPONSE OF NANNOCHLOROPSIS SP. (EUSTIGMATOPHYCEAE): A STUDY OF CHANGES IN ULTRASTRUCTURE AND PSU DENSITY

Fisher

Berner

Iluz

et al. 1998

Journal of Phycology

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“…The influence of environmental factors on cell structure of filamentous blue-green algae has been investigated by Giesy (10) and Peat and Whitton (18). Peat Physiological and cytological studies on photosynthetic bacteria (4,8,9) and on Chlorellac (27) have shown that environmental conditions drastically affect the structure and pigment content of these cells. The specific chlorophyll content and the amount of photosynthetic membranes are inversely related to the light intensity and directly related to the temperature of growth of these organisms.…”

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Photosynthetic Membrane System in Anacystis nidulans

Allen

1968

J Bacteriol

109

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Cultures of Anacystis nidulans were grown under conditions of varying light intensity and temperature. Changes in pigment content were compared with changes in the fine structure of these cells. Pigment concentration and lamellar content varied inversely with the light intensity in cells grown with 100 and 1,000 foot candles of fluorescent light. Estimations of the relative area and volume of lamellae in cells showed that the amount of double membrane was directly proportional to the chlorophyll content of whole cells. Continuity of double membranes with cytoplasmic membrane was observed.

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Die stoffwechselphysiologischen Benziehungen Zwischen Paramecium bursaria Ehrbg. und Chlorella spec. in der Paramecium bursaria-Symbiose

Reißer

1976

Arch. Microbiol.

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The endosymbiotic association of Paramecium bursaria Ehrbg. with Chlorella spec. (green Paramecium) was studied both physiologically and cytologically. Comparison of the properties of the symbiotic unit with those of the symbiotic partners which had been isolated from it revealed the following features and differences: 1. Up to 6000 lux the photosynthetic capacity of the symbiotic unit is higher than that of the isolated symbiotic algae grown independently in mass culture under defined conditions. Alga-free Paramecium bursaria (colourless Paramecium) show a very low rate of CO2-fixation. 2. The green Paramecium has a higher compensationpoint of photosynthesis (4000-5000 lux) than the isolated alga (200-400 lux). 3. Green paramecia consume less oxygen in darkness than colourless organisms but more than the isolated algae. 4. The uptake of carbohydrates from the culture medium by green parpmecia is lower than the uptake by alga-free P. bursaria but higher than the one of the isolated algae. 5. Symbiotic algae within the intact symbiotic unit show tightly packed photosynthetic membranes and an intense disposition of starch. In the presence of 3-(3,4-Dichlorophenyl)-1,1-dimethylurea (DCMU) or in darkness the arrangement of thylakoids is less compact and the deposition of starch is reduced. The growth and the number of the symbiotic algae in situ is regulated by a complex mechanism to which the intracellular level of carbohydrates belongs. The results are discussed in connection with ecological aspects of the Paramecium bursaria-endosymbiosis.

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Electron spin resonance signals and cell structure of Chlorella pyrenoidosa grown under different light intensities

Cited by 23 publications

References 11 publications

THE KINETICS OF THE PHOTOACCLIMATION RESPONSE OF NANNOCHLOROPSIS SP. (EUSTIGMATOPHYCEAE): A STUDY OF CHANGES IN ULTRASTRUCTURE AND PSU DENSITY

THE KINETICS OF THE PHOTOACCLIMATION RESPONSE OF NANNOCHLOROPSIS SP. (EUSTIGMATOPHYCEAE): A STUDY OF CHANGES IN ULTRASTRUCTURE AND PSU DENSITY

Photosynthetic Membrane System in Anacystis nidulans

Die stoffwechselphysiologischen Benziehungen Zwischen Paramecium bursaria Ehrbg. und Chlorella spec. in der Paramecium bursaria-Symbiose

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