Relationship of Dissociation of Cellular Proteins by Incipient Drought to Physiological Processes

1. The centrifuge method was used to determine the structural viscosity of protoplasm in leaf cells of Mnium sp. and Bryum sp. which had been dried for periods up to 50 minutes. In other experiments with Mnium, dried plants were placed in water and the viscosity determined after periods varying from 15 to 90 minutes. 2. Incipient drought conditioned a decrease in the structural viscosity as a consequence of protein dissociations. During the recovery period a decrease in viscosity preceded the return to normal. 3. It is suggested that the dissociation of cellular proteins by incipient drought conditions an increased protoplasmic swelling pressure, accelerated rates of respiration and polysaccharide hydrolysis and may at times lead to mitotic abnormalities.

[1]  E. J. Baldes,et al.  A study of the osmotic properties of erythrocytes , 1942 .

[2]  N. Childers,et al.  INFLUENCE OF SOIL MOISTURE ON PHOTOSYNTHESIS, RESPIRATION, AND TRANSPIRATION OF APPLE LEAVES. , 1941, Plant physiology.

[3]  L. V. Heilbrunn.  The Action of Calcium on Muscle Protoplasm , 1940, Physiological Zoology.

[4]  H. Lehmann,et al.  Some factors influencing the formation of Robison ester from glycogen and inorganic phosphate in muscle extract. , 1939, The Biochemical journal.

[5]  F. G. Hopkins,et al.  The influence of thiol groups in the activity of dehydrogenases. II: With an addendum on the location of dehydrogenases in muscle. , 1938, The Biochemical journal.

[6]  W. B. Welch.  WATER RELATIONS IN BRYOPHYLLUM CALYCINUM SUBJECTED TO SEVERE DRYING. , 1938, Plant physiology.

[7]  A. L. Schipper.  Some Effects of Hypertonic Solutions upon Development and Oxygen Consumption , 1938, Physiological Zoology.

[8]  A. Buhmann.  Untersuchungen an Epidermiszellen von Bergenia cordifolia, Ein Beitrag zur Frage der Volumkontraktion der Zellen bei Plasmolyse , 1937, Protoplasma.

[9]  K. O. Pedersen.  Molecular State of Proteins in Mixtures and Concentrated Solutions , 1936, Nature.

[10]  B. Wada.  Mikrurgische Untersuchungen lebender Zellen in der Teilung. III , 1936 .

[11]  H. Davson.  Studies on the permeability of erythrocytes: The cation content of erythrocytes of rabbit's blood in hyper- and hypo-tonic sera. , 1936, The Biochemical journal.

[12]  J. Sumner.  THE CHEMICAL NATURE OF ENZYMES. , 1933, Science.

[13]  W. R. Duryee.  THE RELATIONSHIP BETWEEN THE WATER CONTENT AND OXYGEN CONSUMPTION OF THE ORGANISM. , 1932, Science.

[14]  G. T. Caldwell.  Studies in Water Metabolism of the Cat. The Influence of Dehydration on Blood Concentration, Thermoregulation, Respiratory Exchange, and Metabolic-Water Production , 1931, Physiological Zoology.

[15]  E. Ponder,et al.  The measurement of red cell volume , 1930, The Journal of physiology.

[16]  J. Fraymouth.  The Moisture Relations of Terrestrial Algae , 1928 .