title: [Effect of hypobaric hypoxia on the dehydrogenase activities of respiration and photosynthetic metabolism in barley seedlings].
abstract: Hypobaric hypoxia effects on enzymes of photosynthesis and respiration metabolism were explored in 8-day old seedlings of barley Hordeum vulgare L. in the dark or light. 16-hour exposure in rarified atmosphere that causes reductions of partial pressure of air gases and, consequently, hypobaric hypoxia (P(air) = 8.3 κPa, pO2 = 1.7 κPa, pCO2 = 0.003 κPa) up-regulated the activities of piruvate kinase, alcohol dehydrogenase, glucose-6-phosphate dehydrogenase and NADP x N-glyceraldehyde phosphate dehydrogenase both in the dark and light. NAD- and NAD-N-malate dehydrogenase activities were down-regulated. Levels of NAD- and NAD x H- malate dehydrogenases were decreased. Activation of the NADP-malic enzyme activity, invariably high activity of NADP-isocitrate dehydrogenase and growth of NADP x N- glyceraldehyde phosphate dehydrogenase are considered as a mechanism of barley seedlings adaptation to hypobaric hypoxia.
authors.forename: S A
authors.initials: SA
authors.lastname: Voytsekovskaya
authors.forename: T P
authors.initials: TP
authors.lastname: Astafurova
authors.forename: G S
authors.initials: GS
authors.lastname: Verkhoturova
authors.forename: V M
authors.initials: VM
authors.lastname: Postovalova
mesh_terms: D000222:Adaptation, Physiological; D015687:Cell Hypoxia; D019069:Cell Respiration / Q000502:physiology*; D003624:Darkness; D015536:Down-Regulation; D001467:Hordeum / Q000201:enzymology*; D008027:Light; D010088:Oxidoreductases / Q000378:metabolism*; D010788:Photosynthesis / Q000502:physiology*; D036226:Seedlings / Q000201:enzymology; D015854:Up-Regulation
chemical_list: D010088:Oxidoreductases