Some cellular and molecular properties of abscisic acid: its particular involvement in growing plant roots

1998 ◽  
Vol 54 (8) ◽  
pp. 851-865 ◽  
Author(s):  
P. E. Pilet
Keyword(s):  
Abscisic Acid ◽  
Molecular Properties ◽  
Plant Roots

scholarly journals The Action of Abscisic Acid on Ion Uptake and Water Flow in Plant Roots

1972 ◽  
Vol 25 (6) ◽  
pp. 1125 ◽  
Author(s):  
WJ Cram ◽  
MG Pitman
Keyword(s):  
Abscisic Acid ◽  
Water Flow ◽  
Ion Uptake ◽  
Plant Roots ◽  
Maximum Effect ◽  
Total Uptake ◽  
Maize Roots

Abscisic acid was shown to inhibit transport of potassium and chloride from the cut ends of excised barley and maize roots. Transport to the shoot of intact barley seedlings was also inhibited. Total uptake into the excised root of barley did not appear to be affected by abscisic acid. There was an increase in tracer accumulated in the root accompanying the reduction in transport from the cut end. Concentrations of abscisic acid above 10-6M produced the maximum effect.

scholarly journals Abscisic-acid-dependent regulation of Arabidopsis thaliana ammonium transport relies on ABI1 control of CIPK23 and AMT1

2021 ◽  
Author(s):  
Pascal Ganz ◽  
Romano Porras-Murillo ◽  
Toyosi Ijato ◽  
Jochen Menz ◽  
Tatsiana Straub ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Abscisic Acid ◽  
Abiotic Stress ◽  
Protein Kinase ◽  
Growth Conditions ◽  
Plant Roots ◽  
Ammonium Uptake ◽  
Ammonium Transport ◽  
Ammonium Toxicity ◽  
Ammonium Transporters

SummaryAmmonium uptake at plant roots is regulated at the transcriptional, post-transcriptional and post-translational levels. Phosphorylation by the protein kinase CIPK23 transiently inactivates the ammonium transporters (AMT1s) but the phosphatases activating AMT1s remain unknown. Here, we have identified the PP2C phosphatase ABI1 as an activator of AMTs in Arabidopsis thaliana. We show that high external ammonium concentrations elevate the stress phytohormone abscisic acid (ABA) by de-glycosylation. Active ABA is sensed by ABI1-PYL complexes followed by the inactivation of ABI1 activating CIPK23. Under favourable growth conditions, ABI1 reduces AMT1 phosphorylation, both by binding and inactivating CIPK23, and by the direct dephosphorylation of AMT1s. Thus, ABI1 is a positive regulator of ammonium uptake, coupling nutrient acquisition to abiotic stress signalling. Elevated ABA reduces ammonium uptake during stress situations, such as ammonium toxicity, whereas ABI1 reactivates AMT1s under favourable growth conditions.

Differential accumulation of methyl jasmonate-induced mRNAs in response to abscisic acid and desiccation in barley (Hordeum vulgare)

1992 ◽  
Vol 86 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Steffen Reinbothe ◽  
Christiane Reinbothe ◽  
Jorg Lehmann ◽  
Benno Parthier
Keyword(s):  
Abscisic Acid ◽  
Hordeum Vulgare ◽  
Methyl Jasmonate

Antitranspirant action of abscisic acid and ten synthetic analogs in black spruce

1990 ◽  
Vol 80 (3) ◽  
pp. 365-370 ◽  
Author(s):  
Terence J. Blake ◽  
Weixing Tan ◽  
Suzanne R. Abrams
Keyword(s):  
Abscisic Acid ◽  
Black Spruce ◽  
Synthetic Analogs

Signalling gates in abscisic acid-mediated control of guard cell ion channels

1997 ◽  
Vol 100 (3) ◽  
pp. 481-490 ◽  
Author(s):  
Michael R. Blatt ◽  
Alexander Grabov
Keyword(s):  
Abscisic Acid ◽  
Ion Channels ◽  
Guard Cell

Abscisic acid levels of individual leaf cells

1990 ◽  
Vol 80 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Enno Brinckmann ◽  
Wolfram Hartung ◽  
Margarete Wartinger
Keyword(s):  
Abscisic Acid ◽  
Individual Leaf
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