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Corrochano, L.M. and Galland, P. (2006) Photomorphogenesis and Gravitropism in Fungi. In: Kues, U. and Fischer, R., Eds., The Mycota I, Growth, Differentiation and Sexuality, Springer-Verlag, Berlin, Heidelberg, 231-257.
AUTHORS: Werner Schmidt
KEYWORDS: MDWS (Micro-Dual Wavelength Spectrophotometer), Δ GIAC (Differential Gravity-Induced Absorption Change), Phycomyces blakesleeanus, Sporangiophore, Micro- and Hypergravity, Texus 50, Sounding Rocket, Gravireception
ABSTRACT: Under parabolic flight conditions microgravity is not lower than 3 to 5 times 10-2 g. In contrast to parabolic flights, sounding rocket flights are virtually vibrational-free allowing microgravity as low as 10-5 g. Thus, a rotating platform serving as centrifuge allows the precise generation of gravitational forces ranging from 5 to 100 mg (not possible during parabolic flights). On this basis we determined the threshold1 for optical reflection/absorption changes in Phycomyces to be lower than 25 × 10-3 g. This compares well with the threshold determination of gravitropism in Phycomyces on a clinostat centrifuge. Kinetics of gravity-induced absorption changes and gravity as generated by the on-board centrifuge do not coincide but show a distinctive hysteresis with a latency of 4 s (75 mg-ramp, pull-up).