scholarly journals Phytochrome Control of Maize Coleoptile Section Elongation

1981 ◽  
Vol 67 (2) ◽  
pp. 355-357 ◽  
Author(s):  
Timothy J. Warner ◽  
James D. Ross ◽  
James Coombs
Keyword(s):  
Maize Coleoptile ◽  
Coleoptile Section

scholarly journals Fusicoccin (FC)-Induced Rapid Growth, Proton Extrusion and Membrane Potential Changes in Maize (Zea mays L.) Coleoptile Cells: Comparison to Auxin Responses

2021 ◽  
Vol 22 (9) ◽  
pp. 5017
Author(s):  
Małgorzata Polak ◽  
Waldemar Karcz
Keyword(s):  
Membrane Potential ◽  
Rapid Growth ◽  
Proton Pumps ◽  
Proton Extrusion ◽  
Membrane Hyperpolarization ◽  
Fungal Toxin ◽  
Maize Coleoptile ◽  
Lag Times ◽  
Kinetics Of ◽  
Indole 3 Acetic Acid

The fungal toxin fusicoccin (FC) induces rapid cell elongation, proton extrusion and plasma membrane hyperpolarization in maize coleoptile cells. Here, these three parameters were simultaneously measured using non-abraded and non-peeled segments with the incubation medium having access to their lumen. The dose–response curve for the FC-induced growth was sigmoidal shaped with the maximum at 10−6 M over 10 h. The amplitudes of the rapid growth and proton extrusion were significantly higher for FC than those for indole-3-acetic acid (IAA). The differences between the membrane potential changes that were observed in the presence of FC and IAA relate to the permanent membrane hyperpolarization for FC and transient hyperpolarization for IAA. It was also found that the lag times of the rapid growth, proton extrusion and membrane hyperpolarization were shorter for FC compared to IAA. At 30 °C, the biphasic kinetics of the IAA-induced growth rate could be changed into a monophasic (parabolic) one, which is characteristic for FC-induced rapid growth. It has been suggested that the rates of the initial phase of the FC- and IAA-induced growth involve two common mechanisms that consist of the proton pumps and potassium channels whose contribution to the action of both effectors on the rapid growth is different.

scholarly journals Identification of IAA Transport Inhibitors Including Compounds Affecting Cellular PIN Trafficking by Two Chemical Screening Approaches Using Maize Coleoptile Systems

2012 ◽  
Vol 53 (10) ◽  
pp. 1671-1682 ◽  
Author(s):  
Takeshi Nishimura ◽  
Naoyuki Matano ◽  
Taichi Morishima ◽  
Chieko Kakinuma ◽  
Ken-ichiro Hayashi ◽  
...  
Keyword(s):  
Chemical Screening ◽  
Maize Coleoptile ◽  
Transport Inhibitors ◽  
Screening Approaches

Xanthoxin, a recently discovered plant growth inhibitor

1972 ◽  
Vol 180 (1060) ◽  
pp. 317-346 ◽  
Keyword(s):  
Plant Growth ◽  
Growth Inhibitor ◽  
Wheat Coleoptile ◽  
Spectroscopic Techniques ◽  
Plant Growth Inhibitor ◽  
Coleoptile Section ◽  
Cress Seed ◽  
Aba Content ◽  
Seed Germination Test

The naturally occurring plant growth inhibitor xanthoxin which was discovered in these laboratories has been prepared in vitro by the oxidation of the pigment violaxanthin with neutral zinc permanganate solution. By the use of chemical and spectroscopic techniques, xanthoxin has been characterized as a mixture of the 2- cis , 4- trans - and 2- trans , 4- trans -isomers of 5-(1', 2', -epoxy-4'-hydroxy-2', 6', 6'-tri-methyl-1'-cyclohexy)-3-methyl-pentadienal. These are also obtained by similar oxidations of neoxanthin, antheraxanthin and lutein epoxide. Cis, trans -xanthoxin probably arises from the corresponding cis -xanthophyll and its conversion to ( + )-ABA by simple chemical procedures is reported. The biological activity of cis, trans -xanthoxin has been shown to be considerably greater than that of the trans, trans -isomer. It is comparable with that of ( ± )-ABA in the wheat coleoptile section, the lettuce hypocotyl and bean petiole abscission tests, but greater than that of ( ± )-ABA in the cress seed germination test. Xanthoxin is shown to antagonize the growth-promoting effects of the plant hormones 3-indolylacetic acid, gibberellic acid and kinetin. Other xanthoxin derivatives have been prepared and their activities in several tests are also reported. The uptake of xanthoxin by tomato shoots leads to a subsequent large increase in the ABA content of the tissue. Evidence is presented for a possible biogenetic conversion of cis, trans -xanthoxin into ( + )-ABA by plants.

Indol-3-essigsäure induzierte Calciumionen- abgabe bei Maiskoleoptilzylindern / 3-Indol Acetic Acid Induced Efflux of Calciumions by Maize Coleoptile Sections

1973 ◽  
Vol 28 (11-12) ◽  
pp. 777-778 ◽  
Author(s):  
Boris Janistyn
Keyword(s):  
Acetic Acid ◽  
Maize Coleoptile ◽  
Indol Acetic Acid

Abstract 3-Indol acetic acid, calcium, adenosin-3':5'-monophosphat (c-AMP), maize coleoptile sections

White light promotes the formation of diferulic acid in maize coleoptile cell walls by enhancing PAL activity

1997 ◽  
Vol 99 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Mohammad Masud Parvez ◽  
Kazuyuki Wakabayashi ◽  
Takayuki Hoson ◽  
Seiichiro Kamisaka
Keyword(s):  
White Light ◽  
Cell Walls ◽  
Pal Activity ◽  
Maize Coleoptile ◽  
Diferulic Acid

Auxin augments conductance of K + inward rectifier in maize coleoptile protoplasts

Planta ◽  
1999 ◽  
Vol 208 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Gerhard Thiel ◽  
Ralf Weise
Keyword(s):  
Inward Rectifier ◽  
Maize Coleoptile

Abscisic acid induction of GTP hydrolysis in maize coleoptile plasma membranes

1998 ◽  
Vol 25 (5) ◽  
pp. 539 ◽  
Author(s):  
Helen R. Irving
Keyword(s):  
Abscisic Acid ◽  
G Protein ◽  
G Proteins ◽  
Pertussis Toxin ◽  
Plasma Membranes ◽  
Dependent Manner ◽  
Gtpase Activity ◽  
Heterotrimeric G Proteins ◽  
Gtp Hydrolysis ◽  
Maize Coleoptile

Since receptor-coupled G proteins increase GTP hydrolysis (GTPase) activity upon ligands binding to the receptor, a study was undertaken to determine if abscisic acid (ABA) induced such an effect. Plasma membranes isolated from etiolated maize (Zea mays L.) coleoptiles were enriched in GTPase activity relative to microsomal fractions. Vanadate was included in the assay to inhibit the high levels of vanadate sensitive low affinity GTPases present. Under these conditions, GTPase activity was enhanced by Mg2+, stimulated by mastoparan, and inhibited by GTPγS indicating the presence of either monomeric or heterotrimeric G proteins. The combination of NaF and AlCl3 is expected to inhibit heterotrimeric G protein activity but had little effect on GTPase activity in maize coleoptile membranes. Cholera toxin enhanced basal GTPase activity, confirming the presence of heterotrimeric G proteins in maize plasma membranes. Pertussis toxin also slightly enhanced basal GTPase activity in maize membranes. Abscisic acid enhanced GTPase activity optimally at 5 mmol/L Mg2+ in a concentration dependent manner by 1.5-fold at 10 µmol/L and up to three-fold at 100 µmol/L ABA. Abscisic acid induced GTPase activity was inhibited by GTPγS, the combination of NaF and AlCl3, and pertussis toxin. Overall, these results are typical of a receptor-coupled G protein responding to its ligand.

scholarly journals Ca2+-Stimulated Exocytosis in Maize Coleoptile Cells

2000 ◽  
Vol 12 (7) ◽  
pp. 1127-1136 ◽  
Author(s):  
Jens-Uwe Sutter ◽  
Ulrike Homann ◽  
Gerhard Thiel
Keyword(s):  
Maize Coleoptile
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