title: The role of calcium ions in cytological effects of hypogravity.
abstract: Electron-cytochemical and biochemical methods made it possible to reveal certain differences in ATPase activity stimulation by calcium ions in root apex cells of pea seedlings and moss protonema Funaria hygrometrica grown under stationary and slow clinostatic (2 rev/min) conditions. It was showed that under clinostatic conditions in comparison with the control variant the ATPase activity decreases in plasmalemma. The protein content in the plasmalemma fraction was also twice as low under these conditions. The root apex cells of the pea seedlings grown under spaceflight conditions were found to contain high concentrations of membrane-bound calcium. The data obtained are discussed in relation to problems of possible mechanisms of disturbance in calcium balance and the system of active calcium ion transport through plasmalemma under hypogravity.
authors.affiliation: N.G. Kholodny Institute of Botany, UkrSSR Academy of Sciences, Kiev, USSR.
authors.forename: E L
authors.initials: EL
authors.lastname: Kordyum
authors.forename: N A
authors.initials: NA
authors.lastname: Belyavskaya
authors.forename: E M
authors.initials: EM
authors.lastname: Nedukha
authors.forename: T A
authors.initials: TA
authors.lastname: Palladina
authors.forename: V A
authors.initials: VA
authors.lastname: Tarasenko
mesh_terms: D019068:Bryopsida / Q000201:enzymology / Q000378:metabolism* / Q000648:ultrastructure; D002118:Calcium / Q000378:metabolism* / Q000502:physiology; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism; D006112:Gravitation; D008854:Microscopy, Electron; D018532:Pisum sativum / Q000201:enzymology / Q000378:metabolism* / Q000648:ultrastructure; D010940:Plant Proteins; D018518:Plant Root Cap / Q000201:enzymology / Q000378:metabolism / Q000648:ultrastructure; D012399:Rotation; D013026:Space Flight; D014893:Weightlessness
chemical_list: D005227:Fatty Acids; D010940:Plant Proteins; D000252:Calcium-Transporting ATPases; D002118:Calcium