Microgravity as the experimental basis for understanding of the peculiarities of plant morphogenesis in the gravitational field

1Demkiv, OT, 2Kordyum, EL, 1Khorkavtsiv, Ya.D, 3Tairbekov, MG
1Institute of Ecology of the Carpathians of the National Academy of Sciences of Ukraine, L’viv, Ukraine
2M.G. Kholodny Institute of Botany of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
3SSC RF «Institute of Medical and Biological Problems» RAS, Moscow, Russia
Kosm. nauka tehnol. 2006, 12 ;(5-6):030-035
Publication Language: Ukrainian
Spiral growth of the gravisensitive protonema of Ceratodon purpureas moss is revealed in real microgravity during space flight. Caulonema differentiation with oblique cell partitions and deviation of an apical cell growth zone from the growth horizontal axis were shown to precede the stolon spiralization. The slope of subapical cell walls enables an apical cell to revolve on its long axis, overcome the substrate and gravity resistance, and become twisted. Investigations of C. purpureus, Burbula unguiculata and Physcomitrella patens protonema growth in the conditions of 1 g, real and simulated microgravity (clinorotation) in darkness and under different light intensity and nutrient medium composition show that protonema morphogenesis is above all regulated by endogenous signals, action of which is concealed by gravity or light on the Earth.
Keywords: clinorotation, microgravity, morphogenesis
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