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Information × Registration Number 0221U101626, 0120U101575 , R & D reports Title Investigation of gravisensity and gravitropic reactions in space flight conditions as an adaptive factor in plant ontogenesis. popup.stage_title Head Lobachevska Oksana V., Кандидат біологічних наук Registration Date 23-01-2021 Organization Institute of the Ecology of the Carpathians NAS Ukraine popup.description2  The influence of light and inhibitors of auxin transport on the branching coefficient and the angle of inclination of the gravitropic protonema lateral branches of Antarctic moss species Polytrichum arcticum Sw. ex Brid. and Bryum caespiticium Hedw. relatively to the gravity vector were studied. It is shown that red and blue light are primarily a trigger of photomorphogenesis, which is enhanced by the polarizing effect of gravity on the growth orientation. Inhibition of polar transport of auxin by the phytotropin N-1-naphthyl-phthalamic acid (NFA) and brefeldin led to the decrease of the gravity counteraction and an increase bending angle of the lateral branches. It is established that the direction of growth of lateral branches of the protonema of the investigated mosses determined by the angle of their inclination relatively to the gravity vector, which is regulated by the transport system of the indole acetic acid. The effect of UV irradiation on the content of soluble (vacuolar) and bound in the cell wall fractions of UV-absorbing phenolic components as well as flavonoids and their absorption spectra in shoots of Polytrichum arcticum and Bryum caespiticium from Antarctica was analyzed. It was found that UV irradiation activates the phenolic compounds synthesis in moss shoots, which absorb UV irradiation. The content of UV-absorbing compounds bound in the cell wall was significantly higher compared to the concentration of soluble (vacuolar) phenolic compounds in samples of plants B. caespiticium and P. arcticum from Antarctica and the Lviv population, which indicates their key role in protection cells from UV radiation. Analysis of the absorption spectra of flavonoids of P. arcticum and B. caespiticium plants from Antarctica and Lviv population shows the presence of flavonols – rutin and quartcetin and flavonoids – luteolin, which increase the effectiveness of cell protection against UV. Product Description popup.authors Kit Nadiia A Kyyak Natalia Ya. Lobachevska Oksana V. popup.nrat_date 2021-01-23 Close