title: Relation between ionic and hormonal regulation of proton pumps in red beet tonoplast.
abstract: Effects of indoleacetic, abscisic, gibberellic acids and kinetin on the hydrolytic activity of the proton pumps H+-ATPase (EC 3.6.1.3) and H+-pyrophosphatase (EC 3.6.1.1) under non-optimal ionic conditions were studied in tonoplasts isolated from stored roots of red beet (Beta vulgaris L. cv. Bordo). We showed that ionic composition markedly affected the hormonal regulation. H+-pyrophosphatase was more sensitive to the ionic and hormonal regulation than H+-ATPase. Magnesium ions are essential for the maximal manifestation of hormonal stimulation.
authors.affiliation: Siberian Institute of Plant Physiology and Biochemistry, Siberian Division of the Russian Academy of Sciences, Irkutsk. cell@sifibr.irkutsk.ru
authors.forename: N V
authors.initials: NV
authors.lastname: Ozolina
authors.forename: E V
authors.initials: EV
authors.lastname: Pradedova
authors.forename: R K
authors.initials: RK
authors.lastname: Salyaev
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D000225:Adenine / Q000031:analogs & derivatives* / Q000494:pharmacology; D027461:Beta vulgaris / Q000166:cytology / Q000201:enzymology*; D005875:Gibberellins / Q000494:pharmacology; D007210:Indoleacetic Acids / Q000494:pharmacology; D043564:Inorganic Pyrophosphatase; D007701:Kinetin; D008274:Magnesium / Q000378:metabolism; D010937:Plant Growth Regulators / Q000494:pharmacology; D018517:Plant Roots / Q000187:drug effects / Q000201:enzymology* / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D006180:Proton-Translocating ATPases / Q000378:metabolism*; D011755:Pyrophosphatases / Q000378:metabolism*; D014617:Vacuoles / Q000378:metabolism
chemical_list: D005875:Gibberellins; D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; C030737:indoleacetic acid; D000040:Abscisic Acid; C007842:gibberellic acid; D011755:Pyrophosphatases; D043564:Inorganic Pyrophosphatase; D006180:Proton-Translocating ATPases; D008274:Magnesium; D000225:Adenine; D007701:Kinetin; D011188:Potassium