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Samples of a synchronous culture of Chlorella vulgaris were treated with: (a) atrazine, (b) atrazine + glucose, or (c) glucose. Cultures were sampled 0, 24, 48, and 72 hr, after treatment. Chlorophyll and packed cell volume were determined on each, and electron micrographs were taken. Atrazine prevented normal increase in packed cell volume and chlorophyll; this cessation of growth was counteracted by glucose. Chlorella utilized both the endogenous products of photosynthesis and an exogenous energy source, glucose in this instance, simultaneously. The atrazine-treated cells did not contain starch; control cells, atrazine-glucose- and glucose-treated cells did. Atrazine did not cause any observable abnormalities in cell organelles. 相似文献
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CHIBA YASUTANE; AIGA ICHIRO; IDEMORI MASAHIRO; SATOH YOKO; MATSUSHITA KAMEHISA; SASA TSUTOMU 《Plant & cell physiology》1967,8(4):623-635
- The relation between chlorophyll content and the hydrolyticactivity of chlorophyllase in Chlorella protothecoides was examined.An increase in the activity was parallel to that in chlorophyllcontent during the development of green colouration, or greeningcourse, in the bleached cells. The activity sharply declinedand a parallel disappearance of chlorophyll was also found duringbleaching of the green cells.
- A partially purified water-solublepreparation of chlorophyllasewas obtained by n-butanol treatmentand fractionation with coldacetone. It showed high activityand hydrolyzed 2 mg chlorophylla per hr per mg protein.
- Forseparation and identification of the pigments concernedin thechlorophyllase reaction, a new solvent system of paperchromatographywas introduced.
- When methyl chlorophyllide a and phytol wereincubated withthe enzyme, two products were formed. By comparisonwith theRf values of isolated pure substances, one was identifiedaschorophyll a and the other as chlorophyllide a. This enzymedid not catalyze the phytylation of free chlorophyllide a, butit had the ability to attach phytol to methyl chlorophyllidea. The final step in the biosynthesis of chlorophyll a is brieflydiscussed.
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RESPIRATION STUDIES ON CHLORELLA. II. INFLUENCE OF VARIOUS ORGANIC ACIDS ON GAS EXCHANGE 总被引:4,自引:4,他引:0
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Eny DM 《Plant physiology》1951,26(2):268-289
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1. The effect on oxygen evolution of Chlorella vulgaris produced by light intensities up to about 40,000 f.-c. has been studied by the use of the Warburg technique. 2. Above a certain critical intensity, which is determined by the previous history of the cells, the rate of oxygen evolution decreases from the maximum to another constant rate. This depression is at first a completely reversible effect. 3. With a sufficiently high intensity this constant rate represents an oxygen uptake greater than the rate of dark respiration. During such a constant rate of oxygen uptake a progressive injury to the photosynthetic mechanism takes place. After a given oxygen consumption the rate falls off, approaching zero, and the cells are irreversibly injured. 4. The constant rate of oxygen evolution (2 and 3) decreases in a continuous manner with increasing light intensities, approaching a value which is approximately constant for all lots of cells regardless of previous history. 5. Two alternative hypotheses have been presented to explain the observed phenomena. The more acceptable of these proposes quick inactivation of the photosynthetic mechanism, the extent of inhibition depending on the light intensity. 6. In Chlorella vulgaris solarization is influenced by the previous history of the cells. 相似文献
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Robert Emerson 《The Journal of general physiology》1927,10(4):469-477
Chlorella, when made heterotrophic by means of certain sugars, respires like other heterotrophic cells when subjected to the respiratory inhibitors, hydrocyanic acid, hydrogen sulfide, and carbon monoxide. Whether the case of Chlorella is typical for green cells in general remains to be seen. Experiments with various other green organisms are being carried out, in hope of settling this point. 相似文献
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