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Ukr. Bot. J. 2017, 74(5): 488–496
https://doi.org/10.15407/ukrbotj74.05.488
Plant Physiology, Biochemistry, Cell and Molecular Biology

Gravity-dependent modification of reproductive development of mosses

Lobachevska O.V., Kyyak N.Ya., Khorkavtsiv Ya.D., Kit N.A.
Abstract

The peculiarities of the generative and vegetative reproduction of some species of mosses depending on environmental factors were determined. It was established that different gravireactions of two ecomorphs of Bryum pseudotriquetrum depend on climatic conditions of the region. It was shown that the gravity polarizing effect can be an active osmotic regulatory factor for renewal vegetative reproduction and development acceleration of Leptobryum pyriforme during seasonal water shortage in natural environment. Under conditions of hypoxia and horizontal clinorotation, alcohol dehydrogenase (ADH) activity is a precondition for more rapid maturation of male gametangia rather than female ones, which provides a higher possibility of fertilization. At the stage of formation of sexual organs in Bryum argenteum, increasing sensitivity to the oxidative stress initiated by clinorotation was established. Reversibility of physiological processes after restoring the gravity vector can be considered as adaptation of the reproductive system to imitation of microgravity.

Keywords: gravisensitivity, reproduction, gametangium, mosses

Full text: PDF (Ukr) 1.47M

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