The Maximum Efficiency of Photosynthesis: A Rediscovery

Burk, Dean; Hendricks, S. B.; Korzenovsky, Mitchell; Schocken, Victor; Warbürg, Otto

doi:10.1126/science.110.2853.225

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…Burk and associates (27) , by applying improved and simplified procedures, appear to have fully verified the original findings of Warburg and have extended them in certain directions. These authors concluded that a maximum of 4 quanta of light of wavelengths 630 to 660 mu is required to liberate one molecule of oxygen.…”

Section: Photosynthesismentioning

confidence: 63%

Effects of light on plants : a literature review, 1950

Garner¹

1962

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in 1950. It is published with only very minor editorial changes from a manuscript which he left, to record a contribution by one of the two pioneers who discovered photoperiodism.It gives his interpretation on problems of light relationships to plant response, particularly photoperiodism in 1950, after a lifetime of research in this field.He discusses the role of visible and near-visible radiation and reviews the literature on effects of light duration, intensity and quality in relation to growth and physiologic process of plants, phototropism, phy tosynthesis , and photoperiodism.iii CONTENTS

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Section: Photosynthesismentioning

confidence: 63%

Effects of light on plants : a literature review, 1950

Garner¹

1962

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“…

The centrifugations employed by Warburg and his associates (7,8) in preparing Chlorella for quantum efficiency measurements have been very brief and mild in comparison to those customarily used in preparing algae and other microorganisms for metabolic studies: sedimentation was incomplete, and the thin layers of loosely packed cells resuspended when shaken, gently for only a few seconds. Warburg, Burk and Schade (8) state that Chlorella is damaged by strong centrifuging, and that the cells may be partially destroyed during the resuspension of tightly packed sediments.

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confidence: 99%

Photosynthesis in Heavily Centrifuged Algae¹

Clendenning

Brown

1956

Physiologia Plantarum

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“…The amount of the unknowns in the xylem exudate decreased rapidly with age of the barley seedling, but remained present in considerable quantity in older plants. LITERATURE Rieke (25), Emerson and Lewis (11), and Daniels with various co-workers (15) found that the efficiency of photosynthesis did not exceed a value of about 30 %, while Warburg (30) with various co-workers (6,7,31,34) has published a series of papers in which he reports efficiencies of 70 % and upwards to 100 %. We refer 1 Received May 23, 1955.…”

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confidence: 99%

“…The data for the light-to-dark transition at 10°C were used to derive the value of k for the theoretical curves plotted in figure 6. The fit of the observations for this transition is shown by the open circles plotted in figure 6.…”

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Transient Changes in Cellular Gas Exchange and the Problem of Maximum Efficiency of Photosynthesis

Emerson¹,

Chalmers²

1955

Plant Physiol.

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PLANT PHYSIOLOGY P32 labeled compounds of the xylem exudate. Only radioactive inorganic sulfate was present on chromatograms of the exudate collected over 24 hours. The S35 inorganic sulfate in the exudate fluid was isolated chromatographically as easily as the phosphate, but no detailed study of time versus amount of S35 in the exudlate has been run. SUMMARYThe xylem exudate of several species of plants contained three P32 labeled compounds-inorganic phosphate, and two unknown phosphorus containing compounds. As much as 20 % of the total radioactive phosphorus has been observed in the unknown compounds from the exudate on decapitated tomato stems. Sulfur was present only as inorganic sulfate.The two unknown phosphorus-containing compounds are normal constituents of the xylem sap, but they have not been detected in the exudate from squash peduncle. The unknown present in largest amounts in the exudate from decapitated plants was also found in barley guttate. The two unknowns are normal constituents of the xylem exudate rather than wound compounds on the cut surface of the stem or leaf base or products formed by radiation injury from the p32.The percentages of p32 in the unknowns reached a maximum value about 4 hours after the addition of P32 to the nutrient solution bathing the roots. This time lag was independent of when the plant was decapitated to collect exudate. It is interpreted as indicative of the rate of incorporation of phosphate into these compounds.Both the seeds of seedlings and the roots of older plants contributed to the formation of the two unknown phosphorus-containing substances. Removal of the seed from young seedlings severely reduced the amount of these compounds present. The amount of the unknowns in the xylem exudate decreased rapidly with age of the barley seedling, but remained present in considerable quantity in older plants. LITERATURE (6,7,31,34) has published a series of papers in which he reports efficiencies of 70 % and upwards to 100 %. We refer

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The Maximum Efficiency of Photosynthesis: A Rediscovery

Cited by 19 publications

References 3 publications

Effects of light on plants : a literature review, 1950

Effects of light on plants : a literature review, 1950

Photosynthesis in Heavily Centrifuged Algae¹

Transient Changes in Cellular Gas Exchange and the Problem of Maximum Efficiency of Photosynthesis

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The Maximum Efficiency of Photosynthesis: A Rediscovery

Cited by 19 publications

References 3 publications

Effects of light on plants : a literature review, 1950

Effects of light on plants : a literature review, 1950

Photosynthesis in Heavily Centrifuged Algae1

Transient Changes in Cellular Gas Exchange and the Problem of Maximum Efficiency of Photosynthesis

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Photosynthesis in Heavily Centrifuged Algae¹