Inhibition of Gibberellic Acid-Induced Elongation-Growth of Pea Epicotyls by Xyloglucan Oligosaccharides

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Abstract
The biological activity of a cell wall-derived xyloglucan nonasaccharide (XG9) was investigated using a bioassay with entire pea epicotyls (Pisum sativum cv. Progress). The xyloglucan fragment was found to inhibit gibberellic acid-induced elongation of etiolated pea epicotyls with maximum inhibition at concentrations ranging from 10−11 to 10−9M. Growth of etiolated epicotyls in the absence of exogenously applied GA3 was also inhibited by XG9 in the same concentration range. A cell wall-derived heptasaccharide (XG7) lacking the fucosyl-galactosyl-side chain showed no inhibitory effect in the pea epicotyl bioassay with and without exogenous GA3. Furthermore, the biological activity of a synthetic pentasaccharide (XG5), containing the fucosylgalactosyl-side chain which is necessary for the biological activity was investigated in the same bioassay. Compared to XG9 the pentasaccharide had a similar inhibitory activity on GA3-promoted elongation as well as on the endogenous growth in the absence of exogenously applied GA3, but did not exhibit a distinct concentration optimum.

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