Olena Nedukha

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Plants grown in spaceflight conditions are more susceptible to colonization by plant pathogens. The underlying causes for this enhanced susceptibility are not known. Possibly the formation of structural barriers and the activation of plant defense response components are impaired in spaceflight conditions. Either condition would result from altered gene(More)
The influence of microgravity on the susceptibility of soybean roots to Phytophthora sojae was studied during the Space Shuttle Mission STS-87. Seedlings of soybean cultivar Williams 82 grown in spaceflight or at unit gravity were untreated or inoculated with the soybean root rot pathogen P. sojae. At 3, 6 and 7 d after launch while still in microgravity,(More)
The cellulose distribution in the epidermal and mesophyll cells of Sium latifolium leaves at the flowering and seedling phases is studied with the use of confocal laser scanning microscopy. Pascal is used to determine that the relative content of cellulose in cell walls is dependent on the leaf tissue type, the plant ontogenesis phase, and the growing(More)
The study of pathogenicity of higher plants under conditions of microgravity is of great importance for the future production of food in space. Previous work suggests that microgravity affects both microbes and plants. Bacterial numbers increased after 17 days in an algae-bacterium association on the biosatellite "Kosmos-1887". This was speculated to result(More)
The study of the influence of weak, alternating magnetic field, which was adjusted to the cyclotron frequency of Ca2+ and K+ ions, on the fusion of tobacco and soya protoplasts was carried out using the extra apparatus with ferromagnetic shield. An increase in the frequency of protoplasts fusion in 2-3 times and participation of calcium ions in the(More)
Plants are an important component of the controlled ecological life-support system (CELSS) for future long-term spaceflight and the International Space Station. Therefore, it is critical to understand the susceptibility of plants to pathogen infection in microgravity. An increase in both hyphal growth and sporangia formation in Phycomyces blakes in(More)
Comparative analysis of the cellular ultrastructure and pigment content of both submerged and above-water Sagittaria sagittifolia leaves with transmission electron microscopic and biochemical methods were realized. Essential distinctions of S. sagittifolia ultrastructure of photosynthesizing cells in submerged leaves were revealed during the comparison with(More)
The major purpose of these experiments were to investigate growth of potato storage organs and starch synthesis in minitubers at slow horizontal clinorotation (2 rpm), which partly mimics microgravity, and a secondary goal was to study the activity and localization of phosphorylase (EC 2.4.1.1) in storage parenchyma under these conditions. Miniplants of(More)
A comparative analysis of the cellular ultrastructure and pigment content of both underwater and above-water Sagittaria sagittifolia leaves was conducted by means of the method of transmission electron microscopy and spectrophotometric analysis. Considerable distinctions of the S. sagittifolia ultrastructure, photosynthesizing cells of underwater leaves in(More)