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Plant and Cell Physiology, 1994, Vol. 35, No. 5 719-727
© 1994

Synthesis of Cell Wall Galactans from Flax (Linum usitatissimum L.) Suspension-Cultured Cells

Florence Goubet and Claudine Morvan

Equipe "Paroi et Polymères Pariètaux", SCUEOR URA 203 CNRS, Faculté des Sciences, Université de Rouen 76821 Mont Saint Aignan Cedex, France

Cell walls of flax suspension-cultured cells contain both ß1 -> 4 galactan (most of which can be extracted with boiling water) and ß 1 -> 3, ß 1 -> 6 galactan (most of which can be solubilized with alkali). The relative level of ß 1 -> 4 galactan in the cell walls is maximal during the lag phase, accounting for an average of 8% of the dry cell-wall mass, whereas the relative level of ß 1 -> 3, ß 1 -> 6 galactan increases throughout growth, reaching a maximum (up to 20%) during the exponential phase.

Two peaks of galactan synthase activity can be detected that catalyze the synthesis of ß 1 -> 4 galactan at pH 8 during the lag phase and the synthesis of ß 1 -> 3, ß 1 -> 6 galactan at pH 5 during the growth phase. At the end of the growth phase both activities are negligible.

(Received December 6, 1993; Accepted April 8, 1994)
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