Polyamines are the natural compound, act as anti-senescent agents, reduce rate of respiration, delay ethylene production, retard colour change, maintain fruit firmness. Show that plays a pivotal role in postharvest life fruits and vegetables. The objective this study was to investigate effect post-harvest application polyamines different concentration on physico-physiological quality parameters...

The biochemical properties of polyamine transport system have been studied in detail in NB-15 mouse neuroblastoma cells in culture by measuring the uptake of [14C]putrescine under various experimentally imposed pharmacological conditions. Putrescine uptake in the NB-15 mouse neuroblastoma cells appeared to be a sodium-dependent process. Iso-osmotic displacement of Na+ in the assay medium with e...

Six litters of newborn crossbred piglets were utilized to examine 1) the effects of substituting 20% of the protein of an all-milk protein liquid diet with a soy protein isolate (milk-soy diet) on small intestinal variables and 2) the effects of supplementing this milk-soy diet with 25 g of either putrescine or ethylamine per kilogram diet on small intestinal variables. Small intestinal xylose ...

Putrescine (1,4-diaminobutane), the product of the decarboxylation of ornithine, is a precursor of the polyamines spermidine and spermine. After administration in uiuo of radiolabeled ornithine or putrescine, changes in specific activity of putrescine, spermidine, and spermine have been assessed in normal and regenerating liver and in brain. In both normal liver and in brain, after labeling wit...

Drought stress is a significant environmental variable affecting wheat growth and development. Plant tolerance intimately related to regulators of plants as polyamines. The study assessed the impact drought (50% water irrigation 100% irrigation), priming grains in putrescine (0.25, 0.5, 1 mM), their interactions on growth, yield, physiological attributes plants. conditions declined plant height...

We investigated the effects of different concentrations (0, 1, 2 and 4 mM) of putrescine on chilling injury, fruit quality, ethylene production rate, fatty acid composition and the antioxidant system of cold-stored kiwifruit (Actinidia chinensis Planch. var. chinensis 'Hongyang'). We achieved a significant decrease in ethylene production, maintained fruit quality and alleviated chilling injury ...

New mutations of the polyamine pathway of Neurospora crassa fell into three categories. The majority affected ornithine decarboxylase and lay at the previously defined spe-1 locus. One mutation, JP100, defining the new spe-2 locus, eliminated S-adenosyl-methionine decarboxylase and led to putrescine accumulation. Revertants of this mutation suggested that the locus encodes the enzyme. Two other...

1. In potassium-deficient barley plants 1,4diauinobutane (putrescine), which had been previously characterized, occurs together with a Sakaguchiand ninhydrin-positive compound, whose infrared spectrum and chromatographic properties are identical with those of 1-amino-4guanidinobutane (agmatine). 2. Agmatine and putrescine occur in potassiumdeficient red-clover plants. 3. Under conditions of ade...

Kim, Ki-Han (Wayne State University, Detroit, Mich.). Properties and distribution of intracellular putrescine in a Pseudomonas. J. Bacteriol. 91:193-197. 1966.-A Pseudomonas species which contains putrescine as the only intracellular polyamine was used to study the distribution of putrescine in the cells and the changes in putrescine content upon nitrogen or carbon and nitrogen starvation. In t...

Putrescine is the polyamine present in highest concentration in Escherichia coli; however, few specific functions for it are known. We found that cells growing in nutrient broth supplemented with high concentrations of NaCl, KCl, MgCl*, or sucrose had greatly reduced levels of cellular putrescine. On the basis of osmotic strength, all four solutes produced similar decreases in putrescine conten...