title: Calcium balance changes in tip growing plant cells under clinorotation.
abstract: Calcium is known to play an important role in the regulation of cellular processes as a secondary messenger in signal transduction to a specific response in all eucaryotic cells.  Its messenger role is realized by transient changes in the Ca2+ cytosolic concentration induced by variety of external stimuli such as light, hormones and gravity.  Recent findings claim the modifications in a calcium balance in plant cells in microgravity and under clinorotation reproducing partially the microgravity effect.  Based on these data, the hypothesis is proposed that Ca2+ level changes can trigger the rearrangements in cell metabolism occurring in the conditions of altered gravity.  However, the methods used in previous works permit only to determine the relative quantity of intracellular membrane-bound calcium and to observe the localization of free Ca2+.  Therefore, it is of essential interest to measure the concentration of free calcium ions ([Ca2+]i) in plant cells under the influence of altered gravity.  In this paper results from measurements of the [Ca2+]i in plant cells under clinorotation will be reviewed and discussed in an effort to examine their effectiveness, causes and consequences.
authors.affiliation: Institute of Botany, National Academy of Sciences of Ukraine, Kiev.
authors.forename: E L
authors.initials: EL
authors.lastname: Kordyum
authors.forename: L A
authors.initials: LA
authors.lastname: Danevich
mesh_terms: D002118:Calcium / Q000378:metabolism* / Q000502:physiology; D002121:Calcium Channel Blockers / Q000494:pharmacology; D015220:Calcium Channels / Q000187:drug effects / Q000502:physiology*; D000252:Calcium-Transporting ATPases / Q000037:antagonists & inhibitors / Q000502:physiology; D002614:Chelating Agents; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006112:Gravitation; D007211:Indoles; D007811:Lanthanum / Q000494:pharmacology; D059828:Plant Cells; D063245:Plant Development; D019441:Plant Epidermis / Q000166:cytology / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D018517:Plant Roots / Q000166:cytology / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D010944:Plants / Q000187:drug effects / Q000378:metabolism; D012399:Rotation / Q000009:adverse effects*; D014638:Vanadates / Q000494:pharmacology; D018474:Weightlessness Simulation
chemical_list: D002121:Calcium Channel Blockers; D015220:Calcium Channels; D002614:Chelating Agents; D004791:Enzyme Inhibitors; D007211:Indoles; C059587:Indo-1 pentaacetoxymethyl ester; D014638:Vanadates; D007811:Lanthanum; D000252:Calcium-Transporting ATPases; D002118:Calcium