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Information × Registration Number 0218U006781, 0117U007031 , R & D reports Title Features of morphogenetic processes in mosses under gravity and weightlessness popup.stage_title Head Lobachevska Oksasns Vasylivna, Кандидат біологічних наук Registration Date 05-09-2018 Organization Institute of the Ecology of the Carpathians NAS Ukraine popup.description2 The gravisensitivityof mosses was analyzed. The role of gravity as a key ecological factor was determined. Specialized (ecotypic) changes in the morphogenesis of bryophytes under stress conditions and activity of components of the ascorbate system as one of the links of protection against oxidative degradation of the plant organism were indicated. The influence of clinorotation on the content of components of the ascorbate system - ascorbic (AK), dehydroascorbic (DAC), and diketogulon (DKGK) acids in the shoots of Bryum argenteum Hedw was investigated. It was established that in the conditions of the changed gravity vector, the content of AK decreased and the amount of DAC and DKGK increased. The change in the ratio of components primarily indicates the activation of oxidative processes and the orientation of enzymatic reactions to their elimination. The loss of gravity vector should be considered as a stress factor, which results in the mobilization of ascorbate pool systems that prevent the accumulation of free radicals and stabilize oxidative-reducing and growth responses of cells. It was determined that gravisensitivity and morphological differentiation of protonemata of arid species Weissia tortilis Spreng. - correlative processes. Only kaulonemata stones reactivated on gravitation. Its grow plagiotropically at a slight depth, but can negatively gravitorically rise above the substrate and form a dense orthotropic protonemata and form a solid assimilation coating. Such cells do not respond to gravistymuli, apparently because of their limited growth and low humidity in the air, their morphological form is fundamentally different from gravisensitive apical cells of other types of protonemata. Kaulonemata quickly grows drunk, but apical cells grow and divide, as a result of stolons length increases, and gravessensitivity persists. Gravisensitive shoots of W. tortilis, which obviously contribute to the maximum use of lighting for the energy supply of physiological processes of development and formation of gametangia. Consequently, W. tortilis gravithropism has evolved due to the diversity of growth patterns of the protonemata and, together with other anatomical and morphological features of mosses intended to provide moisture, is an adaptive growth response for settling in natural arid and subarid climatic regions.54815481 Product Description popup.authors Кіт Надія Андріївна Кияк Наталія Ярославівна Лобачевська Оксана Василівна popup.nrat_date 2020-04-02 Close