Gravimorphogenesisgametophytes of mosses

1Lobachevska, OV, 2Khorkavtsiv, Ya.D, 2Kyyak, NYa., 3Kit, NA, 3Danylkiv, IS
1Institute of Ecology of the Carpathians of National Academy of Sciences of Ukraine, L’viv, Ukraine
2Institute of Ecology of the Carpathians of the National Academy of Sciences of Ukraine, L’viv, Ukraine
3Institute of Ecology of the Carpathians of National Academy of Sciences of Ukraine, L'viv, Ukraine
Kosm. nauka tehnol. 2015, 21 ;(4):94–102
Section: Space Life Sciences
Publication Language: Ukrainian

The orientation of lateral branch growth is determined by the angle of inclination relative to the Earth’s gravity vector. It was determined that modulation of IAA signal system and auxin redistribution reduces endogenous counteraction to gravitropism, increasing plagiotropic growth at the same time. Nucleus movement in protonemata cells correlates with the initiation of a new growth zone depending on gravity vector. Obviously, in the cells competent to branching protonemata the signal induces faster movement of the nucleus and coordinates mitotic division and growth of cell wall. Gravimorphogenesis of apical cells depends on the spectral composition of light and hormonal balance. Modification of light effect by kinetin confirms the interaction of photo- and hormonal graviregulation systems. It was established that pHi value has an effect on the gravisensitivity of apical cells. Protonema of mosses adapts to gravitation and other ecological factors by changing its morphological structure — increasing the branching activity and the number of buds and vegetative organs of reproduction and accelerating their development. 

Keywords: gravimorphogenesis, light., phytohormones

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