Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum)

2009 ◽  
Vol 36 (4) ◽  
pp. 362 ◽  
Author(s):  
Diana E. Weston ◽  
James B. Reid ◽  
John J. Ross
Keyword(s):  
Pisum Sativum ◽  
Inhibitory Effect ◽  
Gibberellin Biosynthesis ◽  
Growth Inhibitory ◽  
Auxin Regulation ◽  
Auxin Transport Inhibitor ◽  
Naphthylphthalamic Acid ◽  
Pea Roots ◽  
High Auxin ◽  
Ga Biosynthesis

Auxin promotes GA biosynthesis in the aboveground parts of plants. However, it has not been demonstrated previously that this interaction occurs in roots. To understand the interactions between auxin and GAs in these organs, we treated wild-type pea (Pisum sativum L.) roots with the inhibitors of auxin action, p-chlorophenoxyisobutyric acid (PCIB) and yokonolide B (YkB), and with the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). These compounds generally downregulated GA synthesis genes and upregulated GA deactivation genes, and reduced the level of the bioactive GA1. These effects indicate that in pea roots, auxin at normal endogenous levels stimulates GA biosynthesis. We show also that supra-optimal levels of exogenous auxin reduce the endogenous level of bioactive GA in roots, although the effect appears too small to account for the strong growth-inhibitory effect of high auxin levels.

Reduction of linoleic acid inhibition in production of conjugated linoleic acid byPropionibacterium freudenreichiissp.shermanii

2001 ◽  
Vol 47 (8) ◽  
pp. 735-740 ◽  
Author(s):  
A Rainio ◽  
M Vahvaselkä ◽  
T Suomalainen ◽  
S Laakso
Keyword(s):  
Linoleic Acid ◽  
Conjugated Linoleic Acid ◽  
Inhibitory Effect ◽  
Propionibacterium Freudenreichii ◽  
Growth Inhibitory Effect ◽  
Sorbitan Monooleate ◽  
Whey Permeate ◽  
Growth Inhibitory ◽  
De Man ◽  
Sufficient Concentration

A method for the production of conjugated linoleic acid (CLA) from linoleic acid (LA) using growing cultures of Propionibacterium freudenreichii ssp. shermanii JS was developed. The growth inhibitory effect of LA was eliminated by dispersing it in a sufficient concentration of polyoxyethylene sorbitan monooleate detergent. For the whey permeate medium used, the optimum LA:detergent ratio was 1:15 (w/w). As a result, the cultures tolerated at least 1000 µg·mL–1LA, which was converted to CLA with 57%–87% efficiency. The cis-9, trans-11 and trans-9, cis-11 isomers constituted 85%–90% of the CLA produced. The feasibility of the method was demonstrated also in de Man – Rogosa–Sharpe (MRS) broth.Key words: conjugated linoleic acid, linoleic acid, Propionibacterium freudenreichii ssp. shermanii.

The phosphoenolpyruvate: sugar phosphotransferase system of Streptococcus salivarius. Identification of a IIIman protein

1987 ◽  
Vol 33 (2) ◽  
pp. 118-122 ◽  
Author(s):  
Christian Vadeboncoeur ◽  
Lucie Gauthier
Keyword(s):  
Type Strain ◽  
Wild Type Strain ◽  
Deae Cellulose ◽  
Reaction Medium ◽  
Inhibitory Effect ◽  
Spontaneous Mutant ◽  
Streptococcus Salivarius ◽  
Wild Type ◽  
Phosphotransferase System ◽  
Growth Inhibitory

A double-spontaneous mutant resistant to the growth inhibitory effect of α-methylglucoside and 2-deoxyglucose was isolated from Streptococcus salivarius. This mutant strain, called αS3L11, did not grow on mannose and grew poorly on 5 mM fructose and 5 mM glucose. Isolated membranes of strain αS3L11 were unable to catalyse the phosphoenolpyruvate-dependent phosphorylation of mannose in the presence of purified enzyme I and HPr. Addition of dialysed membrane-free cellular extract of the wild-type strain to the reaction medium restored the activity. The factor that restored the phosphoenolpyruvate–mannose phosphotransferase activity to membranes of strain αS3L11 was called IIIman. This factor was partially purified from the wild-type strain by DEAE-cellulose chromatography, DEAE-TSK chromatography, and molecular seiving on a column of Ultrogel AcA 34. This partially purified preparation also enhanced the phosphoenolpyruvate-dependent phosphorylation of glucose, fructose, and 2-deoxyglucose in strain αS3L11.

Type II oestrogen binding sites in acute lymphoid and myeloid leukaemias: growth inhibitory effect of oestrogen and flavonoids

1990 ◽  
Vol 75 (4) ◽  
pp. 489-495 ◽  
Author(s):  
L. M. Larocca ◽  
M. Piantelli ◽  
G. Leone ◽  
S. Sica ◽  
L. Teofili ◽  
...  
Keyword(s):  
Binding Sites ◽  
Inhibitory Effect ◽  
Type Ii ◽  
Growth Inhibitory Effect ◽  
Growth Inhibitory

Excision and replication of extrachromosomal DNA of pea (Pisum sativum)

1983 ◽  
Vol 3 (2) ◽  
pp. 172-181
Author(s):  
J Van't Hof ◽  
C A Bjerknes ◽  
N C Delihas
Keyword(s):  
Cell Cycle ◽  
Pisum Sativum ◽  
S Phase ◽  
Velocity Sedimentation ◽  
Extrachromosomal Dna ◽  
Chromosomal Dna ◽  
Root Tips ◽  
Dividing Cells ◽  
G2 Phase ◽  
Pea Roots

Experiments with cultured pea roots were conducted to determine (i) whether extrachromosomal DNA was produced by cells in the late S phase or in the G2 phase of the cell cycle, (ii) whether the maturation of nascent DNA replicated by these cells achieved chromosomal size, (iii) when extrachromosomal DNA was removed from the chromosomal duplex, and (iv) the replication of nascent chains by the extrachromosomal DNA after its release from the chromosomal duplex. Autoradiography and cytophotometry of cells of carbohydrate-starved root tips revealed that extrachromosomal DNA was produced by a small fraction of cells accumulated in the late S phase after they had replicated about 80% of their DNA. Velocity sedimentation of nascent chromosomal DNA in alkaline sucrose gradients indicated that the DNA of cells in the late S phase failed to achieve chromosomal size. After reaching sizes of 70 X 10(6) to 140 X 10(6) daltons, some of the nascent chromosomal molecules were broken, presumably releasing extrachromosomal DNA several hours later. Sedimentation of selectively extracted extrachromosomal DNA either from dividing cells or from those in the late S phase showed that it replicated two nascent chains, one of 3 X 10(6) daltons and another of 7 X 10(6) daltons. Larger molecules of extrachromosomal DNA were detectable after cells were labeled for 24 h. These two observations were compatible with the idea that the extrachromosomal DNA was first replicated as an integral part of the chromosomal duplex, was cut from the duplex, and then, once free of the chromosome, replicated two smaller chains of 3 X 10(6) and 7 X 10(6) daltons.

scholarly journals In vitro growth-inhibitory effect of Brazilian plants extracts against Paenibacillus larvae and toxicity in bees

2015 ◽  
Vol 87 (2) ◽  
pp. 1041-1047 ◽  
Author(s):  
Mariana Piana ◽  
Thiele F. de Brum ◽  
Aline A. Boligon ◽  
Camilla F.S. Alves ◽  
Robson B. de Freitas ◽  
...  
Keyword(s):  
Crude Extract ◽  
Inhibitory Effect ◽  
Paenibacillus Larvae ◽  
Dilution Method ◽  
Minimal Inhibitory Concentrations ◽  
Application Method ◽  
Growth Inhibitory ◽  
Toxicity Analysis ◽  
Spreading Disease

American foulbrood (AFB) is a serious worldwide spreading disease in bees caused by Paenibacillus larvae. Plants extracts are known to decrease or inhibit the growth of these bacteria. The purpose of this study was to evaluate the antimicrobial activity of Calendula. officinalis, Cariniana domestica, and Nasturtium officinale extracts against the P. larvae and to evaluate the toxicity of the extracts in bees. In vitro activity against P. larvae of the extracts was evaluated by micro dilution method and the minimal inhibitory concentrations (MICs) were also determined. The concentrations used in the toxicity test were established based on the MIC values and by the spraying application method. The P. larvae was susceptible to the evaluated crude extract of C. officinalis and N. officinale. To C. domestica, only the ethyl acetate (EtAc) fraction and n-butanol (BuOH) fractions had activity against P. larvae. Toxicity analysis in bees showed no toxicity for N. officinale crude extract and for C. domestica BuOH fraction during 15 days of treatment, however, some deaths of bees occurred during the first three days of treatment with C. officinalis and C. domestica EtAc fraction. The results with these species were firstly described and showed that N. officinale crude extract and C. domestica BuOH fraction both presented not toxic effects in the concentration tested by the spraying application method, and can be a useful alternative for treatment or prevention of AFB.

Growth inhibitory effect of bestatin on choriocarcinoma cell finesin vitro

Biotherapy ◽  
1991 ◽  
Vol 3 (4) ◽  
pp. 351-357 ◽  
Author(s):  
Kazuhiko Ino ◽  
Setsuko Goto ◽  
Akemi Kosaki ◽  
Seiji Nomura ◽  
Eiko Asada ◽  
...  
Keyword(s):  
Inhibitory Effect ◽  
Growth Inhibitory Effect ◽  
Growth Inhibitory
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