Ein Beitrag zur Kenntnis des Säurestoffwechsels nichtsukkulenter Pflanzen

Schwarze, P.

doi:10.1007/bf01911868

Cited by 12 publications

(3 citation statements)

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“…The ratio of the ammonia produced in the tissues of the rhubarb to the malic acid was usually about o-i, while the theory that both arise in amino-acid deamination requires a value of i. Hiilme (1936), in a study of the nitrogen metabolism of the apple fruit, found that, in spite of the acid sap of the variety used (Bramley's Seedling), there was always much more asparagine present than ammonia, and Culpepper & Caldwell (1932) were unable to demonstrate the simultaneous formation of organic acids and ammonia in rhubarb, though Schwarze (1932) states that they increase together in Oxalis Deppei exposed to high temperatures in the dark. Pucher et al (1937 a, h) find that the ammonia content of rhubarb is always low and shows no correlation with total acidity or with the concentration of any individual acid.…”

Section: Coohmentioning

confidence: 99%

A Review of Recent Work on the Nitrogen Metabolism of Plants, Part Ii

McKee

1937

New Phytologist

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With I figure in the text) THE ACID AMIDES I N her 1929 review M. E. Robinson summarized the work of E.Schulze and of Pryanishnikov on the role of the acid amides, especially asparagine, in the plant's protein metabolism. Schulze held that asparagine was an essential stage in the synthesis of protein, while Pryanishnikov regarded it rather as a means of storing ammonia in a harmless form, its function thus being similar to that of urea in the animal, except that the latter is excreted and the nitrogen of the asparagine is still available for protein synthesis. The analogy of function between asparagine and urea has also been stressed by Murneek (1935) in a review of work on the metabolism of amides in the plant. The schemes he gives for their formation must now be regarded as unlikely, but this, of course, does not affect the functional analogy. Pryanishnikov's views on the position of asparagine in plant metabolism may be indicated in the following diagram, which is quoted from M. E. Robinson. Amino-acids >• Protein >.Amino-acids t i HNO, ^NH3-« Asparagine -< NHj COOH COOH COj CHNHj CO CHO COOH COOH

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Section: Coohmentioning

confidence: 99%

A Review of Recent Work on the Nitrogen Metabolism of Plants, Part Ii

McKee

1937

New Phytologist

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“…These results (7) imply that the quantities of both "free acid" and "bound acid" are determined analytically. This is not actually possible, though at least two methods are available which yield results that can readily be confused with the "free acid" and "bound acid " contents of the tissue.…”

mentioning

confidence: 69%

SEASONAL CHANGES IN ACIDITY OF THE RHUBARB. (RHEUM HYBRIDUM)

Bennet‐Clark

Woodruff

1935

New Phytologist

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“…The diurnal flucluatioti in the i)rganic acid content is best known in the metabolism of succulents. According to the coticlusions by Schwarze (13), however, this fluctuation is not found in succuletits only, but may be of common occurrence in plants. Thomas ef al.…”

Section: Discussionmentioning

confidence: 93%