Morphogenesis in Plants: Molecular Approaches by Daphne J. Osborne (auth.), Kalliopi A. Roubelakis-Angelakis,

By Daphne J. Osborne (auth.), Kalliopi A. Roubelakis-Angelakis, Kiem Tran Van Thanh (eds.)

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Concentration, diffusion or physiological gradients of materials from the medium into the tissue have been implicated in determining the loci at which primordium initiation begins in tobacco callus (Ross and Thorpe, 1973). This infonnation was obtained by inverting the tissue at different times in culture, which altered the position at which organogenesis occurred. , between SF and NSF media (Hammersley-Straw and Thorpe, 1987), and by the use of osmotic inhibition by high levels of sucrose (Hammersley-Straw and Thorpe, 1988).

However, this mechanism cannot explain how individual cells become activated and induced to undergo de novo organogenesis - or: a process which has at least three requirements, namely (a) cell dedifferentiation, (b) cell interaction, and (c) reaction to specific signals (Thorpe, 1980). , 1958). This idea was proposed on the basis of observations in carrot cell suspensions. While there is no evidence for physical isolation, based on ultrastructural studies with this system (Halperin and Wetherell, 1964), physiological isolation is possible (Thorpe, 1980).

Patel KR. Thorpe TA (1984) Histochemical examination of shoot formation in cultured cotyledon explants of radiata pine. Bot Gaz 145: 312-322. Plumb-Dhindsa PL. Dhindsa RS. Thorpe TA (1979) Non-autotrophic CO2 fixation during shoot formation in tobacco callus. J Exp Bot 30: 759-767. Rathore KS. Hodges TK. Robinson KR (1988) Ionic basis of currents in somatic embryos of Daucus carota. Planta 175: 280-289. Reilly KJ. Washer J (1977) Vegetative propagation of radiata pine by tissue culture: plantJet formation from embryonic tissue.

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