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Information × Registration Number 0222U001526, 0121U109629 , R & D reports Title Investigation of gravisensitivity and gravitropic reactions in space flight as an adaptive factor in plant ontogenesis popup.stage_title Head Lobachevska Oksana V., Кандидат біологічних наук Registration Date 28-01-2022 Organization Institute of Carpathian Ecology of the National Academy of Sciences of Ukraine popup.description2  The influence of phosphorus on morphological modification of gravitropic angles and gravitosensitivity of moss protonemata was analyzed. The object of investigations was the protonema of mosses Ceratodon purpureus Hedw., Physcomitrella patens (Hedw.) Brucht & Shimp., samples of which were collected in the Nature Reserve "Roztocze" and Bryum caespiticium Hedw. from Antarctica. It was determined high content of orthophosphates (Pi) in the gravitropic protonema and the significant difference between the species, which can be explained by their different natural localities and habitat conditions. Under the influence of low concentrations of Pi after gravistimulation moss turfs were formed with higher density and growth rate of stolons and mainly vertical orientation of the protonemata lateral branches. The exception was Physcomitrella patens, whose gravisensitivity decreased, and a significant number of stolons grew almost plagiaristically. Thus, at the morphological and physiological level, the laying of gravidependent angles is modulated by phosphates and is an adaptive response of mosses to phosphate deficit. Gravity increases the rigidity of the cell wall of mosses due to the accumulation of lignin-like compounds in which peroxidase of cell walls is involved. It has been shown that under the gravitational stimulus of mosses under conditions of natural gravity, increased in peroxidase activity in the cell walls is associated with increased in content of lignin-like compounds and may be an adaptation of plant to changes in position relatively to the gravitational vector. Activation of peroxidase of cell walls of the protonema Bryum caespiticium under simulated microgravity indicates the participation of the enzyme in the adaptation of plants to gravitational stress and conditioned by the increasing of free radical oxidation, primarily by increasing the concentration of the hydrogen peroxide. Product Description popup.authors Kit Nadija A. Kyyak Natalia Ya. Lobachevska Oksana Vasylivna popup.nrat_date 2022-03-09 Close