SOME EFFECTS OF POTASSIUM DEFICIENCY ON THE METABOLISM OF THE TOMATO PLANT

1961 ◽  
Vol 39 (3) ◽  
pp. 593-606 ◽  
Author(s):  
L. H. Jones
Keyword(s):  
Amino Acids ◽  
Protein Metabolism ◽  
Free Amino ◽  
Potassium Level ◽  
Potassium Deficiency ◽  
Keto Acid ◽  
Pyruvate Metabolism ◽  
Tomato Plants ◽  
Activity Of Enzymes ◽  
Pyruvic Acids

The organic and keto acid levels in the leaves of tomato plants grown with varying levels of potassium were examined. As the potassium level was reduced, the levels of malic, oxalic, and sometimes pyruvic acids decreased, while citric, α-ketoglutaric, and glyoxylic acids accumulated. Total organic acids remained almost constant at all potassium levels, while such changes as occurred in cation levels were balanced by phosphate. These relationships held for plants grown under widely different environmental conditions and were not affected by the age of the plants. It is suggested that the changes in acid balance were brought about by changes in the activity of enzymes concerned in pyruvate metabolism and by shifts in equilibrium caused by free amino acids and amides accumulated as a result of deranged protein metabolism.

scholarly journals The Effect of Mineral Nutrition on the Content of Free Amino Acids and Amides in Tomato Plants I A Comparison of the Effects of Deficiencies of Copper, Zinc, Manganese, Iron, and Molybdenum

1956 ◽  
Vol 9 (4) ◽  
pp. 539 ◽  
Author(s):  
JV Possingham
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Free Amino Acid ◽  
Mineral Nutrition ◽  
Free Amino Acids ◽  
Free Amino ◽  
Quantitative Estimation ◽  
Acid Fraction ◽  
Tomato Plants ◽  
Copper Zinc

The lovel and the qllHnj~itat,jve compositien of the free amino acid fraction of tomato plants grown in full nutrient and in cultures doficiollt ill zinc, copper, nlallganeso, iron. and molybdenum have beon cletormiuecl. 'I'he methods used in the investigation inelude the quantitative estimation of amino aeids by a technique involving paper chromatogl'l1phy, and the cultm'o of tomato plants in highly purified n utriollt solutions.

Alcohol Production by Fish Spoilage Bacteria

1983 ◽  
Vol 46 (12) ◽  
pp. 1055-1059 ◽  
Author(s):  
AEJAZ AHAMED ◽  
JACK R. MATCHES
Keyword(s):  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Fish Tissue ◽  
High Alcohol ◽  
Bacterial Isolates ◽  
Alcohol Production ◽  
Spoilage Bacteria ◽  
Test Organisms ◽  
Pyruvic Acids

Bacterial isolates (244) identified to genera were tested for their ability to produce ethanol, isopropanol and propanol in a fish tissue extract. All of the isolates produced ethanol and 241 and 227 produced isopropanol and propanol, respectively. One high alcohol producing member of each of the groups Moraxella-like, Pseudomonas, Flavobacterium, Micrococcus and coryneforms was selected for utilization of fish components as substrates in production of alcohol. The substrates tested included four sugars, nine amino acids and lactic and pyruvic acids. Although there were some variations in the levels of alcohols produced by the test organisms from the substrates, the organisms appeared to prefer simple 5 and 6 carbon sugars and then utilized the free amino acids. The level of oxygenation greatly affected the levels of alcohols produced.

The costs of cell volume regulation: protein metabolism during hyperosmotic adjustment

1992 ◽  
Vol 72 (3) ◽  
pp. 569-578 ◽  
Author(s):  
A. J. S. Hawkins ◽  
T. J. Hilbish
Keyword(s):  
Amino Acids ◽  
Cell Volume ◽  
Protein Metabolism ◽  
Free Amino Acids ◽  
Volume Regulation ◽  
Free Amino ◽  
Cell Volume Regulation ◽  
Amino Nitrogen ◽  
Body Protein ◽  
Metabolic Pool

To resolve the sources of amino nitrogen which is accumulated as intracellular solute during hyperosmotic volume regulation, components of protein metabolism were monitored during compensation for a change from 15 to 30% salinity in the blue mussel, Mytilus edulis L. Net solute gain stemmed primarily from a marked reduction in total output from the metabolic pool of free amino acids, most of this ‘saving’ resulting from slower whole-body protein synthesis, and the remainder from lower nitrogenous excretion. Indeed, total inputs to the metabolic pool of free amino acids actually decreased over the period of net solute gain at 30%. Associated contributions from dietary assimilation, de novo synthesis and the direct uptake of dissolved amino acids were each negligible, indicating that breakdown products from endogenous body protein were the only significant source of amino nitrogen accumulated during hyperosmotic regulation. This accumulation represented more than 3% of soft-tissue protein nitrogen within the whole animal. We therefore impress that the excretion, during hyposaline adjustment, of all nitrogen previously accumulated as solute in response to equivalent hypersaline change, represents a major component cost of cell volume regulation, and which helps to explain stress and even mortality consequent upon what may be small but frequent fluctuations of salinity.

Sign in / Sign up

Export Citation Format

Share Document