scholarly journals Effects of Kinetin on Respiration Ethylene Production and Ripening of Banana Fruit Slices

1971 ◽  
Vol 24 (1) ◽  
pp. 165 ◽  
Author(s):  
NL Wade ◽  
CJ Brady
Keyword(s):  
Indoleacetic Acid ◽  
Phosphate Uptake ◽  
Invertase Activity ◽  
Pentose Phosphate ◽  
Plant Tissues ◽  
Banana Fruit ◽  
Solute Uptake ◽  
Thin Slices ◽  
Tissue Changes ◽  
Pentose Phosphate Shunt

Thin slices cut from many plant tissues develop an increased respiration rate in the day or days after cutting (Laties 1963; ap Rees 1966). Mter slicing, the metabolism of the tissue changes in a number of respects including the capacity for salt and other solute uptake (Asprey 1937; MacDonald 1967), the relative contri-bution of the pentose phosphate shunt to total hexose catabolism !ap Rees and Beevers 1960; ap Rees 1966), and the induction of a number of enzymes (Edelman and Hall 1965; Willemot and Stumpf 1967). In the case of slices of arti-choke tissue, the presence of either indoleacetic acid or kinetin inhibits the increases, in response to slicing, of respiration, of phosphate uptake, and of invertase activity (Palmer 1966). While aspects of the latter experiments have been criticized (Vaughan and MacDonald 1967) the conclusion that the growth factors affect the response to slicing has not been challenged.

scholarly journals Impaired erythrocyte phosphoribosylpyrophosphate formation in hemolytic anemia due to pyruvate kinase deficiency

Blood ◽  
1988 ◽  
Vol 72 (2) ◽  
pp. 500-506 ◽  
Author(s):  
CR Zerez ◽  
MD Wong ◽  
NA Lachant ◽  
KR Tanaka
Keyword(s):  
Pyruvate Kinase ◽  
Hemolytic Anemia ◽  
Adenosine Triphosphate ◽  
Pyridine Nucleotide ◽  
Pentose Phosphate ◽  
Atp Depletion ◽  
Pyridine Nucleotides ◽  
Pyruvate Kinase Deficiency ◽  
Nucleotide Content ◽  
Pentose Phosphate Shunt

Abstract RBCs from patients with hemolytic anemia due to pyruvate kinase (PK) deficiency are characterized by a decreased total adenine and pyridine nucleotide content. Because phosphoribosylpyrophosphate (PRPP) is a precursor of both adenine and pyridine nucleotides, we investigated the ability of intact PK-deficient RBCs to accumulate PRPP. The rate of PRPP formation in normal RBCs (n = 11) was 2.89 +/- 0.80 nmol/min.mL RBCs. In contrast, the rate of PRPP formation in PK-deficient RBCs (n = 4) was markedly impaired at 1.03 +/- 0.39 nmol/min.mL RBCs. Impaired PRPP formation in these cells was not due to the higher proportion of reticulocytes. To study the mechanism of impaired PRPP formation, PK deficiency was simulated by incubating normal RBCs with fluoride. In normal RBCs, fluoride inhibited PRPP formation, caused adenosine triphosphate (ATP) depletion, prevented 2,3-diphosphoglycerate (DPG) depletion, and inhibited pentose phosphate shunt (PPS) activity. These results together with other data suggest that impaired PRPP formation is mediated by changes in ATP and DPG concentration, which lead to decreased PPS and perhaps decreased hexokinase and PRPP synthetase activities. Impaired PRPP formation may be a mechanism for the decreased adenine and pyridine nucleotide content in PK-deficient RBCs.

scholarly journals Reversion of Senescence: Effects of 2,4-Dichlorophenoxyacetic Acid and Indoleacetic Acid on Respiration, Ethylene Production, and Ripening of Banana Fruit Slices

1969 ◽  
Vol 22 (3) ◽  
pp. 601 ◽  
Author(s):  
M Vendrell
Keyword(s):  
Aqueous Solutions ◽  
Ethylene Production ◽  
Indoleacetic Acid ◽  
Dichlorophenoxyacetic Acid ◽  
Banana Fruit ◽  
Unripe Fruit ◽  
2,4 Dichlorophenoxyacetic Acid

Slices cut from green, unripe fruit were treated by infiltration with aqueous solutions of 2,4�dichlorophenoxyacetic acid (2,4�D) and indoleacetic acid (lAA). 2,4.D delayed but increased the size of those peaks in respiration and ethylene production which are induced by cutting; ripening was also delayed. These effects were proportional to concentrations of 2,4.D in the range 1O-LlO-3M. Higher concentrations caused injury.

A STUDY OF GLYCOLYTIC AND PENTOSE PHOSPHATE SHUNT ENZYMES IN RELATIONSHIP TO THE ALTERED PERMEABILITY IN THE BLOOD-BRAIN BARRIER

1976 ◽  
Vol 26 (6) ◽  
pp. 1139-1143 ◽  
Author(s):  
M. J. Bennett ◽  
K. M. Ogilvy. ◽  
G. M. Blake ◽  
N. Lewtas ◽  
W. R. Timperley
Keyword(s):  
Blood Brain Barrier ◽  
Pentose Phosphate ◽  
Brain Barrier ◽  
Blood Brain ◽  
Pentose Phosphate Shunt

The Development of Glycolytic and Pentose Phosphate Shunt Enzymes in Human Brain

Neonatology ◽  
1977 ◽  
Vol 31 (3-4) ◽  
pp. 173-180 ◽  
Author(s):  
M.J. Bennett ◽  
W.R. Timperley ◽  
C.B. Taylor ◽  
A.S. Hill
Keyword(s):  
Human Brain ◽  
Pentose Phosphate ◽  
Pentose Phosphate Shunt

scholarly journals Ethylene Production by Slices of Green Banana Fruit and Potato Tuber Tissue During The Development of Induced Respiration

1969 ◽  
Vol 22 (2) ◽  
pp. 489 ◽  
Author(s):  
WB Mcglasson
Keyword(s):  
Ethylene Production ◽  
Plant Tissues ◽  
Underground Storage ◽  
Banana Fruit ◽  
Physiological Changes ◽  
Tissue Slices ◽  
Tuber Tissue ◽  
Plant Parts ◽  
Storage Organs ◽  
Green Banana

It is well known that injury and infection by disease organisms may stimulate ethylene production by plant tissues (Williamson 1950; Burg 1962; McGlasson and Pratt 1964). The increased ethylene production which results from injury in fruit tissues may hasten the onset of a respiratory climacteric. This response, which has been observed in slices cut from three-quarter-grown cantaloupe fruit, may herald the commencement of physiological changes leading to natural ripening (McGlasson and Pratt 1964). However, in underground storage tissues, stimulated ethylene production may be concerned with the mechanisms of wound healing (Stahmann, Clare, and Woodbury 1966; Imaseki, Uchiyama, and Uritani 1968). The phenomenon of induced respiration in tissue slices of bulky underground storage organs has been known for many years (Laties 1967) and more recently it has been found to occur in sections or slices of other plant parts (ap Rees 1966). Palmer and McGlasson (1969) observed a similar rise in slices of green banana fruit which they considered to be a form of "induced" respiration.

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