Morpho-functional peculiarities of the moss Weissia tortilis Spreng. protonemata cells with different gravisensitivity

1Lobachevska, OV, 1Kyyak, NYa., 1Khorkavtsiv, Ya.D
1Institute of Ecology of the Carpathians of the National Academy of Sciences of Ukraine, L’viv, Ukraine
Space Sci. & Technol. 2019, 25 ;(2):60-70
Publication Language: Ukrainian
Gravitropism of bryophytes is species-specific. It depends on the ecological factors and species life strategy. The purpose of the research is to determine the relationship between the morphology of Weissia tortilis Spreng. protonemata cells in the process of differentiation, their resistance to UV irradiation, and the variability of gravitropism. It has been established that the formation of a dense turf from short, unramified chloronematical stolons as an additional growth form of the moss protonemata provides screening of the caulonemata stolons from radiation. We have shown that due to peculiarities of morphogenesis and stolon growth only caulonemata cells of W. tortilis protonemata are gravisensitive. The environmental resistance and the specificity of biochemical reactions depending on the level of gravisensitivity have been determined on the basis of ccomparative investigations of gravisensitivity and carbohydrate metabolism of Ceratodon purpureus Brid and Weissia tortilis Spreng. . It is assumed that the revealed specificity is due to the different tolerance of bryophytes to the influence of stress factors: Ceratodon purpureus is a cosmopolitan gravisensitive moss species, whereas Weissia tortilis is an arid species with gravitropism only at the caulonemata stage.
Keywords: bryophytes, carbohydrate metabolism, gravisensitivity, UV irradiation
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